15 Best Online Grammar Checker Tools in 2020


Do you want to write grammatically correct and properly styled content?

Then you should be using the best grammar tool for your specific needs. Bad grammar and spelling can affect you and your businesses credibility more than you can imagine.

Poorly written content with grammatical and spelling errors will kill the trust of readers. It will also discourage them from visiting your website again or buying something from you. On top of that, grammar is an important factor in the quality of your content, and poor content quality can affect search engine rankings. This is why more and more businesses are using grammar checker tools to improve their online content.

I created this guide to share my own experience with grammar software. I will lay out the key points you should consider when searching for a grammar corrector tool. We will take a look at the best available solutions and review the ones that offer specific features that your business likely needs to improve the writing quality of your online content.

Best Picks 2020
prowritingaid logo ProWritingAid is the grammar checker, style editor, and writing mentor. Sign up for
grammarly logo Grammarly is an easy-to-use grammar and spelling checker. Sign up for
whitesmoke logo WhiteSmoke is the editing tool with grammar and punctuation check. Sign up

Top 15 most popular online grammar checkers

After using a few grammar tools and consulting with content writers, I compiled a list of the best grammar checker tools that I could find on the web.

  1. ProWritingAid – Premium software for bloggers and writers
  2. Grammarly – Easy-to-use tool applying AI processes
  3. WhiteSmoke – Grammar and style checker solution
  4. Ginger Online – Start proofreading your texts fast
  5. LanguageTool – Tool for more than 20 languages
  6. Outwrite – Writing help for clear communication
  7. Online Correction – Online checkеr for spelling and diction
  8. PaperRater – Artificial intelligence to improve your writing
  9. Writer – The grammar checker for professionals
  10. Hemingway App – App that makes your writing bold and clear
  11. Scribens – Powerful English grammar checker
  12. Slick Write – Powerful proofreading tool for better writing
  13. Reverso – Spelling and grammar checker with translation
  14. NOUNPLUS – Simple grammar and spelling checker
  15. Virtual Writing Tutor – Free essay checker

1. ProWritingAid – Premium software for bloggers and writers

prowritingaid homepage

ProWritingAid is a grammar checker and style editor for writers and content creators in general. This editing software not only helps you to quickly edit grammar and punctuation, remove errors, and optimize word choice but it also provides detailed reports to help you improve your writing.

I use this tool on the daily basis as integration to Google Docs, Gmail, and WordPress to double-check for grammar mistakes. I also like the style and terminology suggestions this software provides to perfect my written content.

In addition, the platform offers in-app explanations, suggestions, quizzes, videos, and articles to help you build your writing skills in real-time. ProWritingAid integrates with Google Docs, Microsoft Office, MS Outlook, as well as most web browsers. A Desktop App is available for Windows and Mac. Users can also upload their documents to the platform’s web-based editor.

Key features

  • Spelling and grammar check software.
  • Mac and Windows support
  • Checks for consistencies in spelling, hyphenation, and capitalization.
  • Third-party integration and browser extensions available.
  • More writing reports than any other tool.
  • Suggestions that improve words power and clarity.
  • Checks for plagiarism.

Pricing and plans

ProWritingAid is available in three packages – Free, Premium, and Premium Plus.

Free plan
The free version gives you access to a web-based checker of up to 500 words, as well as a basic browser extension that checks grammar and spelling online.

Premium plan
$20.00 per month.
$79.00 per year.
$299.00 lifetime (one-time payment).

The Premium package allows you to check documents of any size via a desktop app or Google Doc, Microsoft Word, and Scrivener integrations with in-depth reports.

Premium Plus plan
$24.00 per month.
$89.00 per year.
$399.00 lifetime (one-time payment).

For a few extra dollars, a “Premium Plus” version includes all of the same features as the Premium version, as well as 60 plagiarism checks per year.

2. Grammarly – Easy-to-use tool applying AI processes

grammarly homepage

Grammarly is one of the most popular online grammar editing tools (or, as it calls itself, writing assistant) with more than 20 million users. And for good reason.

I used this software when I first started writing longer articles and guides for our website. Also, I know a few bloggers who find this grammar tool handy when creating quality blog posts.

Grammarly’s online grammar checker detects all types of mistakes, from misused words to sentence structure issues. Then, it suggests grammar, spelling, punctuation, and style changes in real-time. When you create a Grammarly account, you will be able to add words to your personal dictionary, select your preferred English dialect, and even check your texts for different genres.

Key features

  • Easy-to-use spelling and grammar checker.
  • A robust algorithm that thoroughly scans your writing errors.
  • Provide specific suggestions based on the context of your writing.
  • Plagiarism detector with the paid version.
  • Third-party integration and browser extensions available.
  • Exceptional user interface.

Pricing and plans

You have a few options to start using Grammarly. There is a free, premium, and business plan. I’m planning to test this Business plan for our online team since we started adding more writers and social media content creators. I’ll keep you posted and share my experience.

Free plan
The Free plan covers all the basics including grammar, spelling, and punctuation, along with another fun feature: tone detector. The tone detector analyzes your word choice and phrasing to identify the tone of your message before you hit send.

Premium plan
$11.66 per month (1-year plan billed as one payment of $139.95).
$19.98 per month (quarterly plan billed as one payment of $59.95).

The Premium plan takes things a step further. It offers the best writing practice recommendations and stylistic suggestions. With the premium plan you also get vocabulary enhancement suggestions, genre-specific writing style checks, and a plagiarism detector that checks more than 16 billion web pages, among other extras.

Business plan
$25.00 per month – for 1 member (minimum 3 members).
$12.50 per month – for 1 member (minimum 3 members, billed annually).

Grammarly also offers a Business plan, for companies who have a team of people involved in content creation. It allows you to choose your team size from 1 to 150+ members and you will be charged per member. For teams larger than 10 members there are special discounts available.

3. WhiteSmoke – Grammar and style checker solution

white smoke tool homepage

WhiteSmoke is a grammar and proofreading software that corrects not only simple spelling mistakes, but everything from word choice, grammar, punctuation, and even style mistakes.

WhiteSmoke also has a translator and dictionary for more than 50 languages, over 100 built-in templates, as well as video tutorials, error explanations, and a plagiarism checker. Its products are based on NLP (Natural Language Processing) technology, featuring unique algorithms and AI for text analysis. The tool offers a mobile app for Android and iOS and also works with Windows, Mac OS, and all web browsers.

Key features

  • AI technology and natural language processing techniques.
  • Expert grammar correction and punctuation checker services.
  • Editing for correction of sentence structure, punctuation, and spelling errors.
  • Anti-plagiarism tool + Thesaurus.
  • Translation services to 55 languages.
  • Simple clutter-free user interface.

Pricing and plans

WhiteSmoke’s web-based writing solution doesn’t have a free trial. It only offers paid packages to get started.

Web plan
$5.00 per month (1-year plan billed as one payment of $59.95)
$3.47 per month (3-years plan billed as one payment of $124.95)

The Web plan works with all browsers and features a grammar checker, translator, and a plagiarism checker. It features an online writing solution for any operating system.

Premium plan
$6.66 per month (1-year plan billed as one payment of $79.95).
$5.55 per month (3-years plan billed as one payment of $199.95)

The Premium plan includes all browsers, desktop client, Gmail, and Microsoft Office compatibility. It comes with a grammar checker, plagiarism checker, one-click instant proofreading, translator tool, and is integrated with all writing platforms. The Premium plan features a fully integrated writing solution for Windows and Mac, and includes a one-computer license.

Business plan
$11.50 per month (1-year plan billed as one payment of $137.95).
$8.82 per month (3-years plan billed as one payment of $317.50).

The Business plan contains all the features included in the Premium plan plus features a fully integrated writing solution for Windows and Mac. It is compatible with all browsers and includes a three-computer license.

4. Ginger Online – Start proofreading your texts fast

ginger software homepage

Ginger Software is a grammar and spelling check system that helps users write faster and better, thanks to its grammar, punctuation, and spell-checking tools.

On top of standard editing tools, Ginger also offers a series of additional features including a text reader, sentence rephraser, dictionary, a translator with over 50 languages, and a personal trainer feature to help you improve your English!

One significant downside is that Ginger doesn’t offer a plagiarism detector. Also, the reporting is rather sparse compared to its competitors.

Ginger can be downloaded directly into Chrome or Safari and works with programs like Outlook, MS Word, and PowerPoint. In addition, Ginger has a desktop app that can be installed on both Mac and Windows, as well as an app for both Android and iOS. The free version allows only 14 checks per month, with browser add-ons, definitions, and translations in 40 languages.

Key features

  • Proven software for spelling and grammar checks.
  • Excels at proofreading your text as you type.
  • Rephrases sentences to improve style.
  • Third-party integration and browser extensions available.
  • Translations in over 60 languages.
  • Personalized practice sessions based on your own writing.

Pricing and plans

Ginger has a free plan with some limitations and a premium version.

Free plan
The free version is available for users with limited features and up to a certain limit for grammar checks. As stated on their User Agreement, Ginger may limit the number of corrections to which you are entitled in a certain period of time (e.g. up to 50 corrections per month).

Premium plan
$20.97 per month.
$7.49 per month (1-year plan billed as one payment of $89.88).
$6.66 per month (2-years plan billed as one payment of $159.84).

The Premium plan comes with all the free features plus translations into more than 50 languages, text reader, sentence rephraser, and more.

5. LanguageTool – Tool for more than 20 languages

language tool homepage

As their official website says, LanguageTool is an “Open Source application developed by a group of language enthusiasts and software developers.” The very fact that it’s powered by Open Source software makes Language Tool a unique online grammar checker.

With its clean interface, Language Tool is super-easy to use and its grammar checker is quite accurate. One of the most important upsides of this tool is that it can be downloaded for offline use. Another great thing is that you can use the Language Tool to check grammar in a number of different languages including Asturian, Catalan, Dutch, English, Esperanto, French, German
Italian, Japanese, Persian, Tamil, and many more!

LanguageTool can be accessed via mobile or web and is compatible with Chrome, Firefox,
Microsoft Word, Google Docs, and LibreOffice. Finally, Language Tool has a forum which not only serves as customer support but also contains tons of helpful content.

Key features

  • Proofreading tool with an easy-to-use, spell, and grammar checker.
  • Corrects grammar in multiple languages
  • Proofreading engine of more than 1,700 patterns for error detection.
  • Translation for over 20 languages.
  • Third-party integration and browser extensions available.
  • Ability to detect mistakes that other similar platforms fail to identify.

Pricing and plans

Language Tool comes with a free plan with some limitations and a premium plan.

Free plan
The free plan offers thousands of patterns for finding errors in various languages like English, French, and German and is limited at 20,000 characters per check, which is a reasonable limit.

Premium plan
$19.00 per month.
$13.00 per month (quarterly plan billed as one payment of $39).
$4.92 per month (1-year plan billed as one payment of $59).

The Premium plan has a limit of 40,000 characters per check, as well as impressive features such as detection of more than 2000 additional errors for English, French, Dutch, and German, detection of incorrect checksums in IBAN and ISBN numbers, and detection of wrong gender use in salutations (only for German).

6. Outwrite – Writing help for clear communication

Outwrite tool homepage

Outwrite is an AI-powered grammar and plagiarism checking tool which uses advanced grammar, spelling and rephrasing suggestions to improve the quality of your writing.

It’s available online as a web app, which means you can sign in from any browser but there’s no desktop app. Outwrite also features extensions for Chrome, Microsoft Word, and Google Docs and has a mobile app that’s currently available only for iOS.

One of the best Outwrite features is the AI Eloquence Engine. It scans your text and offers recommendations on how to improve it by eliminating erroneous words, simplifying sentences, and avoiding the use of passive voice. The Pro plan also has a very efficient Plagiarism Checker which allows you to conduct 50 checks a month.

Key features

  • AI-powered proofreading tool.
  • Improves fluency, efficiency, and clarity of writing with GradeProof’s Eloquence Engine.
  • Tracks statistics about your writing such as grade level, word count, readability.
  • Plagiarism detection ensures the originality of your writing.

Pricing and plans

Outwrite comes with three plans: Essential, Pro, and Teams.

Essential plan
Essential is a free plan that is quite limited as it only includes a very basic spelling and grammar checker. It doesn’t offer all the features provided by the paid plans and the number of scans is limited.

Pro plan
$9.95 per month.

The Pro plan comes with a free trial which gives users one week of full access to all of the extra features of the Pro subscription. The Pro plan is limited to 10,000 words per article but the number of articles you can check is unlimited. It includes: Grammar and spelling engines, Custom dictionary, Punctuation, Capitalization, Repetition, and Word Confusion tools.

Teams plan
$7.95 per month, per user.

Teams plan is for groups that want to enhance their communications. It also gives users one week of full access to all of the extra features of the Teams subscription.

7. Online Correction – Online checkеr for spelling and diction

online correction tool homepage

OnlineCorrection.com has two major upsides: it’s very easy to use and 100% free!

The tool has an easy-to-use website where you can enter your text and check it for grammar and spelling mistakes. It also provides suggestions for vocabulary and sentence construction to improve your writing style. The fact that OnlineCorrection.com is free makes it ideal for students or anyone who can’t afford to buy a grammar tool. However, this does mean that you’ll be seeing non-personalized ads.

The tool was created using programs like DICTION, Hunspell, and LanguageTool. Similar to Grammarly, OnlineCorrection.com supports different English dialects: American, British, Australian, South African, and New Zealand English. The tool makes sure that your privacy is protected at all times by automatically deleting all submitted content after 30 minutes.

Key features

  • Website detection of errors in spelling, style mistakes and basic grammar.
  • Instantly offers suggestions for text improvements.
  • Identical-looking websites with different domain names for different languages.

Pricing and plans

OnlineCorrection is a free tool that can be used by everyone at no cost.

Free plan

8. Paper Rater – Artificial intelligence to improve your writing

paper rater tool homepage

PaperRater is a web-based application targeting mainly high school and college students.

PaperRater checks papers and essays for grammar and spelling errors. It also compares your text with that of other students who are at the same education level and offers recommendations on how to improve your writing. It focuses on sentence length and variability, vocabulary usage, passive voice detection, and phrases to avoid.

PaperRater also provides readability statistics, as well as an automated essay scoring system to give you a rough idea of what grade you might get from your teacher.

This tool also checks for plagiarism. The plagiarism detector relies on the search indexes of the two most popular search engines – Google and Bing – and according to their official website, compares your text to more than 10 billion documents.

PaperRater uses an advanced AI system and data science to analyze submitted texts in real-time and offer almost immediate results (typically 5 to 15 seconds after submission). Users are not required to sign up, log in, or download anything.

Key features

  • Cloud-based spelling and grammar checker software.
  • Offers feedback and writing instructions.
  • Integrated plagiarism detection service with Originality Score.
  • Perfect for students.
  • Immediate analyses and comparison with other students at the same education level.

Pricing and plans

PaperRater has free and premium versions. Although it’s popular among its target audience (it’s used by thousands of students in more than 140 countries), the tool does have limitations. One limitation is that users can only access PaperRater via its website as there’s no mobile support.

Basic plan
The Basic free version allows 10 plagiarism checks a month which can be no longer than 5 pages, each containing up to 300 words. It is available with limited features and up to 50 document submissions per month.

$11.21 per month (1-year plan billed as one payment of $71.55).

The premium plan allows users to do 25 checks per month, each containing 20 pages with up to 300 words each or 6,000 words in total.

9. Writer – The grammar checker for professionals

writer homepage

Writer (formerly Qordoba) goes above and beyond standard grammar checkers. In addition to covering the basics — grammar, punctuation, and tone — Writer performs more content checks than any other writing assistant.

Writer’s key differentiator is the ability to improve your writing for work: to make sure you’re using the right tone, writing style, and terminology for your audience. Writer also checks your company’s content for clarity, readability, approachability, conciseness, writing style, terminology, tone, brand voice, and bias.

Writer is fast becoming the leading writing assistant for companies.

Key features

  • Grammar and spelling checker plus compliance, plain language, plagiarism, and inclusivity checker.
  • Configure content suggestions to your brand voice.
  • Define and consistently use terms and phrases that set your brand apart from the competition.
  • Consistently apply key messaging and ensure no one bungles your elevator pitch, value propositions, or mission statement again.
  • Customize your brand-specific content rules to correct edits you’re making over and over.
  • Use the Styleguide portal to organize and share your brand guidelines in one place, for easy updating and sharing.

Pricing and plans

Writer is available in three tiers – Free trial, Starter, and Enterprise:

Free plan
Writer offers two free options. The first is a free 14-day trial (no credit card required). The second free option is Writer’s free online grammar checker.

The free trial includes basic grammar, spelling, punctuation, and the tone detector.

$49 per month for 5 users.
$9 per month for each additional user.

Contact Writer’s sales team for custom enterprise pricing.

Writer’s Enterprise plan is designed for businesses to scale, and provides multiple workspaces for separate teams. In addition to the Starter plan features, the Enterprise plan includes unlimited custom terms, Styleguides branding and sharing, API access, Word and Google Docs extensions, and SSO.

10. Hemingway App – App that makes your writing bold and clear

hemingway tool homepage

Hemingway App is a grammar checker software available in the form of an online editor or a desktop app.

Unlike the rest of the tools on our list, Hemingway App doesn’t provide in-depth grammatical lessons. Instead, it assesses the overall readability of your text and helps you to improve your writing style.

Once you paste your text into the editor (or write directly into it), instant feedback will appear in the sidebar on the right side of the page. You’ll get information on the letter, character, word, paragraph, and sentence count, as well as the estimated reading time of your text. The app also uses different colors to suggest text improvements. For instance, adverbs and weak language are marked blue, whereas dense and complicated sentences are red and the run-on sentences are noted in yellow. Finally, the Hemingway App gives you a readability score to let you know the reading level of your text.

Key features

  • Writing style checker.
  • Third-party integration and browser extensions available.
  • Primarily focuses on improving the overall readability of any text.
  • Examines every text and rates it by grade level.
  • Incorporated Automated Readability Index technology.
  • Can be used both online and offline.

Pricing and plans

The online version of the Hemingway App is free. You only have to pay a one time charge if you want to use their desktop app (available for Android and iOS).

Free plan

Hemingway Editor 3 (desktop version)
$19.99 lifetime (one-time payment)

The desktop version costs a one-time fee of $19.99 for both Windows and Mac versions and it comes with a few extra features such as free updates, the ability to save and export, and direct publishing to WordPress and Medium.

11. Scribens – Powerful English grammar checker

Scribens homepage

Scribens is a free grammar checker tool that uses a sophisticated syntactical algorithm
to correct more than 250 types of grammar, spelling, and stylistic mistakes including nouns, verbs, prepositions, pronouns, homonyms, typography, and punctuation.

Also, Scribens corrects stylistic elements like redundancies, run-on sentences, repetitions, and even suggests synonyms. Along with the corrections, the tool also offers a readability indicator, explanations to help you improve your writing skills, as well as detailed stats including the number of words, sentences, paragraphs, and more.

Scribens is compatible with MS Office applications, email clients, and with the help of Chrome and Firefox extensions, users can correct their writings directly while using the browsers.

Key features

  • Reliable grammar checker tool.
  • Can correct over 250 types of common grammar and spelling mistakes.
  • Offers explanations to help the writer improve his or her English writing skills.
  • Utilizes an advanced syntactical recognition algorithm.
  • Third-party integration and browser extensions available.

Pricing and plans

Scribens is a free tool that can be used by everyone at no cost.

Free plan

12. Slick Write – Powerful proofreading tool for better writing

Slick Write homepage

Slick Write is a very powerful free online tool for correcting grammatical, spelling, and stylistic errors. It’s an excellent tool for SEO professionals, students, bloggers, and anyone else who loves writing.

It lets you import an existing file for proofreading or write directly on the platform. The text editor comes with lots of stylistic suggestions that you can customize according to your type of text. For instance, if you’re writing a resumé, Slick Write will focus its feedback on professional language.

This tool generates detailed text reports with graphs, helping you keep track of your word count, sentence and paragraph length,
readability score, voice use, and more.

Slick Write offers extensions for Google Chrome and Mozilla Firefox.

Key features

  • Quickly lookup a word in dictionaries, thesaurus, on Google and Wikipedia.
  • Identify paragraphs with the least variety.
  • Word Associator to find contextual word associations.
  • Customizable settings to suit your writing style.
  • Detailed statistics on readability score, reading time, word count, etc.

Pricing and plans

Slick Write is a free tool that can be used by everyone at no cost.

Free plan

13. Reverso – Spelling and grammar checker with translation

Reverso homepage

Reverso is a free online spelling and grammar checker that supports both British and American English. It has a limit of 600 characters, so you can’t proofread very long texts.

It’s a very simple and straightforward tool that checks for the most common mistakes and provides alternative corrections. It also offers dictionary definitions, synonyms, and conjugations.

Reverso is using the Ginger Software tool’s algorithm. That being said, it stands out from many other grammar checkers because of its translation features. It has an online translator with AI capabilities that accurately translates texts and provides examples in context.

You can also listen to native-speaker pronunciations. It supports 15 languages and lets you upload documents for translation.

Apart from accessing this tool online, you can also add it to Google Chrome.

Key features

  • Spelling checker – correct common errors and replace corrections with alternative words
  • Proofreading – check the grammar and explore synonyms, definitions, and conjugations
  • AI-powered translator – translate texts with contextual examples
  • Neural Machine Translation – listen to accurate translations pronounced by native speakers
  • File importing – upload documents for translation

Pricing and plans

Reverso is a free tool that can be used by everyone at no cost.

Free plan

14. NOUNPLUS – Simple grammar and spelling checker

NOUNPLUS homepage

NOUNPLUS is a very simple online grammar and spelling checker for English texts. It corrects grammatical mistakes and misspellings and provides suggestions for improving compositions and the quality of writing. It helps you write logical sentences according to the context and grammar rules.

When checking the spelling, it focuses on context, helping you avoid common pitfalls, such as using “effect” instead of “affect.” It also corrects the spelling based on the UK and US English.

NOUNPLUS also checks your punctuation, enabling you to polish your texts. It doesn’t have browser extensions, but you can easily access it online without registering.

Key Features

  • Contextual spelling checker – avoid common spelling mistakes that change the context
  • Grammar checker – follow the grammar rules and explore suggestions for better compositions
  • Sentence construction checker – write logical sentences based on grammar rules and context
  • Punctuation checker – polish your texts

Pricing and plans

NOUNPLUS is a free tool that can be used by everyone at no cost.

Free plan

15. Virtual Writing Tutor – Free essay checker

Virtual Writing Tutor homepage

Virtual Writing Tutor is a feature-rich free online essay checker with lots of useful capabilities that are ideal for ESL teachers.

When checking grammar, it fixes grammatical errors such as double negatives, collocation, missing auxiliaries, tense shifts, and more. It also corrects false cognates, word choice, and punctuation, as well as contextual spelling mistakes. It can analyze your vocabulary to help you avoid clichés and power words, and achieve better cohesion. Depending on your writing style, it can provide suggestions for common, academic, or field-related vocabulary. This tool also features a paraphrase checker, which is basically a plagiarism checker. Apart from comparing two texts, it also provides a calculated score on the similarities between them.

Virtual Writing Tutor also comes with a grammar checker forum, feedback and links from past grammar checks, and a pen pal exchange. The pen pal exchange lets you create writing projects for students, where you can provide automatic feedback and scoring. You can embed this tool into your website, blog, or Moodle course using an iframe code that you can find on the site.

Key features

  • Grammar checker – correct grammatical and punctuation errors.
  • Spelling checker – correct misspellings and contextual spelling errors.
  • Vocabulary checker – use general, academic, or field-related vocabulary.
  • Paraphrase checker – check texts for plagiarism.
  • Essay checker – check cohesion, tone, argument strength, sophistication, etc.
  • Essay outliner – create outlines for opinion, argument, and prioritized list essays.

Pricing and plans

Virtual Writing Tutor is a free tool that can be used by everyone at no cost.

Free plan
It has a 3000-word limit for members with a free account, while non-members can proofread only 500-word texts.

How to choose a grammar checker software

Writing is regarded as art – it requires perfection at every level. If writing is an art, the master that carves it is the grammar. As there are numerous grammar check tools available to you, here is how to pick the most suitable grammar checker software tailored to your needs.

Extensive compatibility

You should always be able to use your grammar check tool no matter the operating system or device you use. Grammarly is a perfect example of this. It’s a fantastic grammar check tool that offers extensive compatibility and is available to use on multiple systems and devices. It’s perfectly compatible with iOS and Android, you can use it as a desktop app for Windows and Mac, and it offers extensions for Chrome, Edge, and Firefox.

Writing statistics generation

In many cases, writers are commissioned to create documents that have to follow strict standardization and format. As a writer, it’s essential to know if the document you have prepared has met those expectations. It’s extremely helpful if the grammar checker tool you use to proof the text generates in-depth statistics. That’s why it’s important to choose a tool that helps you identify statistics like word count, paragraph length, and average reading time.


Online grammar and punctuation checker tools offer a variety of pricing options. Some of the basic online grammar check tools are entirely free to use; for example, Online Correction. Still, most of the advanced tools come either with a free version with limited features, or a premium/pro version that comes at a cost. Depending on how often you write and need to check over your work, the premium versions of these grammar check options are generally cost-efficient if you opt for the longer subscription terms.

Software features

Each specific grammar check tool comes with a particular set of features attached. Consider what you need, how you are going to use the software, and what features are offered by each option before you make your final decision. Each tool offers the same core features like grammar check, expert spelling, sentence checker, writing style, punctuation, and originality checker. However, particular tools come with additional features like writing stats, vocabulary, and proofreading. Make a list of all of the features that you need, find the perfect solution within the offered tools, and improve your writing.

Third-party integrations

In case you want to use one of the tools to improve your blogging skills, ensure that it integrates seamlessly with WordPress and other third-party applications. Not every grammar check tool offers this feature, and it could save you a lot of time and effort along the way. For instance, ProWritingAid is a grammar tool that provides integrations with applications such as MS Office, Outlook, Google Docs, Scrivener, and Final Draft.

Best of the best

Students copy editors, and even professional writers use grammar and editing tools to improve their writing and to ensure quality in their write-ups. There are several reasons why people use grammar software.

Bloggers use grammar tools to make sure their writing is free of all errors and are quickly accepted by the website editor.

Teachers and students also use these platforms to make sure that they are issuing and submitting the right essays and content. Even website developers use the tools to improve the writing of web copy and to attract more visitors to a website. Quality writing instantly improves the credibility of a website.

The grammar checker tools improve the worthiness of a text with robust grammar solutions. Some of these tools are equipped with AI capabilities to ensure smart learning and give better suggestions for write-ups.

Best for grammar check

Grammar-checking tools are the key to avoid embarrassing grammatical errors in your papers. Regardless of your academic level or expertise, if your writing has mistakes, your credibility goes down.

The tools proofread every piece of content, identify spelling errors, and even suggest better words to improve readability. These tools can identify and rectify errors in a matter of seconds, which saves time.

These are the two best grammar-checking tools, in our opinion.


It is a premium grammar editor for bloggers, novelists, and business writers. It is easily accessible online for both Windows and Mac. It also supports integration with Microsoft Word, Google Docs, and Scrivener. It is termed as one of the best because of its remarkable features and ability to improve the overall writing.

Key features

  • Grammar rules and suggestions
  • Learn more feature that gives an in-depth explanation
  • Specific examples to help in comprehending a mistake


It is one of the most advanced grammar checker online tools available online. It scans your text for over 400 grammar rules, including subject-verb agreement, passive voice, and much more.

Key features

  • Explains grammar rules
  • Offers suggestions on tone, vocabulary and much more
  • Detects misused words and typos

Best for punctuation check

The incorrect use of punctuation can kill the meaning of a sentence. Even a misplaced comma can change the context of the entire sentence. Everybody can miss out on these errors. But several punctuation checker tools can help you get rid of these mistakes when writing.

Here are two of the best punctuation checking tools:


WhiteSmoke has a state-of-the-art punctuation detector to help you analyze and correct your mistakes. This makes it an excellent choice as your punctuation checker.
Also, it is smart enough to identify less-obvious punctuation mistakes such as missing commas, wrong placement of semicolons, or unnecessary hyphens. It works as your tutor and guides through the mistakes to help you write better.

Key features

  • AI-integrated punctuation checker
  • Highlights errors and offers possible suggestions
  • Provide writing tips to avoid punctuation errors in the future

Ginger Online

This is one of the best punctuation tools that is available as a browser extension, and you can easily add it to MS-Word. It helps you improve your writing and corrects any punctuation error. Ginger’s groundbreaking technology fixes these mistakes with the utmost accuracy. The tool has made punctuation-checking fast and easy.

Key features

  • Analyzes the context of your sentence
  • Single-click punctuation correction
  • Corrects error after scrutiny

Best free grammar tools

Most free online grammar checker tools do a good job of finding grammatical errors and offering suggested corrections. These free tools can be extremely beneficial for students to check their assignments, papers, and essays or for bloggers who can run a quick grammar check for any post they create.

Selecting the best free grammar check tool depends on the features that you require for an accurate grammar check.

Here are the two best free grammar check tools that can help you enhance your writing.

Hemingway App

Hemingway App is the easiest to use online grammar check free tool. All you have to do is go to its website, paste your text in the editor’s text box, and check for mistakes. Not only does it check grammar, but it also detects the style and tone of the written content. It was designed to help the user increase the readability of a piece which is done by displaying a readability score of your content and improvement suggestions. Hemingway App has a clean and simple layout that can help you analyze your content quickly before posting it.

Key features

  • No content word limit
  • Five colored recommendations for clarity
  • Locates the overuse of passive phrases and adverbs

After the Deadline

It is another best free grammar checker tool that is available as a Google Chrome spell check extension. Once you have installed it in the browser, you will just have to click it and view the options. After the Deadline finds passive voice, redundant phrases, and complex expressions to report you so that you can work on them and write better in the future.

Key features

  • Jargon, double negatives and hidden verbs detection
  • Advanced style checking
  • Misused words detection
  • Errors explanation

Best iOS grammar apps

Learning grammar has become even easier with smartphones now. Several grammar iOS apps correct grammatical mistakes to help you read and write correctly.

So, if you are looking for an app that corrects your grammar on the go, you can read our analysis on two of the best iOS grammar checking apps which are completely free and can be easily found on the Apple Store.


CorrectMe is a fast and user-friendly app to improve your writing. Not only does it correct all your grammar and spelling mistakes as you type, but it also uses a built-in synonym checker to offer suggestions for different words. While this app is completely free for all iOS devices, it does come with a pro version that you can purchase. The pro version offers advanced features, such as smart recommendations and grammatical explanations.

Key features

  • Detects contextual grammar mistakes
  • Detects spelling mistakes
  • Shows recommendations to fix them
  • Grammatical errors explanation


Speller is another cool app for iOS devices. It’s an open-source spellchecker that combines multiple sources to help you find definitions. It is equipped with Spanish, American, British, and Canadian dictionaries. Being a spelling-checker app, it checks spellings as you type, helping you write error-free texts. It is a great tool to enhance your writing, especially for formal write-ups.

Key features

  • Instant feedback in the text field
  • Alternate spelling suggestions
  • Dictionaries available in multiple languages

Best Android grammar apps

Android smartphones are now more preferred than desktop computers as they are easy to use. So, if you want to check the grammar of your content on your android smartphone, there are several apps available on the Play Store.

Through these interactive apps, not only let you detect grammatical and spelling mistakes, but also let you learn and improve your skills.

Here are the best mobile grammar and spelling checker apps, all of which are completely free and can be found on Google Play.

English Grammar Spell Checker

This app is like a portable grammar dictionary that you can carry in your pocket. It corrects all your grammar and spelling mistakes as you type and helps you write error-free sentences. The app also comes with a text-to-speech option, which is perfect if English is your second language, and you want to learn proper pronunciation. The app can read aloud everything you type.

Key features

  • Provides 600 interactive activities
  • Designed for both beginners and experts
  • In-app help
  • Multiple languages

Spell Checker

The Spell Checker app is another awesome app for Android that can help you write sentences without any spelling mistakes. It’s great for proofreading your texts, be those messages, emails, notes, or any other type of content. It doesn’t include any grammar checks, but its spelling checks are more than useful. As soon as it detects a spelling mistake, it flags it and provides suggestions from its dictionary to correct the mistake. What makes this app stand out is the option to send your messages directly from the app. You can send messages to Facebook, Twitter, Skype, and other platforms, including email. This saves time, and the app even stores and organizes all your typed documents. The app also offers a voice-typing function, so you can save time and write quickly.

Key features

  • Saves all corrected documents
  • Voice to text input
  • Edit and take notes
  • Supports English, Russian and Armenian


What is the best free grammar checker?

Nothing is free in this world, and neither are the best grammar checker tools. They all offer a free version, but to unlock the best features of any given grammar and punctuation checker tool, you will have to get their premium or pro version. As for free versions, Grammarly’s free version is a marvelous thing to have installed on your device as you write. Hemingway App is also a smart free option choice as it will conduct a free grammar check on your document, and it will detect the style and tone of your written content.

What is the best grammar checker app?

Hands down, we go with Grammarly. Grammarly isn’t just a precautionary measure against writing mistakes but is a habit-forming system to improve your writing proficiency. You can easily keep track of your progress in the weekly usage reports, so you will be aware of your recurring mistakes and it will help you to avoid the same mistakes again. The app will also help improve your vocabulary and check if your writing is plagiarism-free, all in a matter of seconds. Another great option is ProWritingAid.

How can I check my grammar online?

Most of the grammar checker tools that I have listed above can check your grammar online. Visit their official website, copy and paste your text to be examined into the selected area, and enjoy a basic grammar check. The checker will highlight your mistakes and offer its suggested corrections. If you need a more in-depth grammar check, we advise you to acquire a paid version of the checker tool that suits your needs best.

Can grammar checkers work offline?

Not all of them, but there are a couple of tools that work offline too. You probably won’t receive the same quality of service as with online checkers, but if you are a person that is often on the road, or you simply don’t have a stable Internet connection all of the time, offline grammar checkers can get the job done as well. Some offline options are Ginger Software, WhiteSmoke, and Hemingway App.

How do I check my grammar on Google Chrome?

Grammar checking tools such as ProWritingAid and Grammarly offer their users the ability to install a Google Chrome plug-in extension. With the installment of the plug-in, you will be able to eliminate the grammatical mistakes you make while using the browser, no matter if you are writing a post on social media, using Gmail services, or posting a comment on a blog.


With these 15 online grammar checker tools, proofreading and editing your writing should be a breeze! All of these tools come with different features, pros, cons, and capabilities. And while no tool can meet all of your requirements, think about your writing needs, the amount of help that you need with it, and select the perfect grammar tool that will help you elevate your game to the next level so that you can enjoy writing like never before.

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13 comments on “15 Best Online Grammar Checker Tools in 2020

  1. Writing in English is difficult for everybody who is not strong in the English language. Sometimes you might think that you have written a perfect post but did you know that small mistakes can give away to the charm of your writings. So, it is wiser to use Noun Plus grammar checker tool.

  2. I use Grammarly and I particularly love the features. It works both on my phone and pc and it has significantly improved my writing skills. I totally recommend them to everyone who really wants to get serious with professional writing.

  3. Wow. This list has everything and I’m not even sure which to pick anymore. They all have amazing features and I’m sure they will work just as I want. Maybe I’ll try the Grammarly since I heard a lot of good reviews about it.

  4. Grammarly is the best. I have it as an extension in Chrome and also in my MS Word application. It has made writing a lot easier and the fact that I get reasons and explanations on each error is enough to improve my vocabulary and writing.

  5. I’ve used like 4 of the tools on this list and they all delivering the expected results. If you write professionally, or even for yourself, you may want to have one of these to make the whole thing a lot easier and faster for you.

  6. I have no problem with grammar, being a college English teacher. But I am an abominable speller. So I need a spellchecker that is 50 times better than the ridiculous one that comes with WORD, which is beyond belief stupid and idiotic! I also don’t know how to download a superb spellchecker that will automatically open in Word every single time without me having to do anything special. I’ve tried following online directions, but I just don’t understand them, and they don’t function for me.
    Suggestions for a smart editor that is dim about spelling and computers??

  7. For years I have been stalling trying to write a book but didn’t have a clue of how to put together the manuscript because I had major problems with grammar, spelling, and simply putting a manuscript to begin with!

  8. Thank you Anja for this great list of grammar checker tools! I’m using Ginger Online and for a single payment of $40, you can get it for life.

  9. For all the mistakes, Grammarly will give you an explanation of what you did wrong and offer to improve or replace errors. Great tool for a small price!

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