7 Best AI Grammar Checker Tools to Improve Writing

Why Use an AI Grammar Checker

An AI grammar checker reads your text and flags mistakes in seconds. It catches spelling slips, wrong punctuation, awkward sentences and tone problems that a basic spell check misses. Many tools also rewrite weak sentences for you.

This guide covers seven tools that writers, students and teams use the most in 2026. For each one you get what it does, the key features, the current price and who it suits best. Every price and feature below was checked against the official product pages in October 2026.

Quick Comparison

Official pricing pages opened October 15, 2026. LanguageTool and Ginger prices from 2026 third party listings.

All seven tools have a free plan. The chart shows the entry paid plan for each one, so you can see the spread at a glance. The table below shows the three things that most often decide which tool fits.

1. Grammarly

Grammarly is the most widely used AI grammar checker, with more than 40 million users. It works almost everywhere you type, including Chrome, Word, Google Docs, Gmail, Windows, Mac, iPhone and Android.

Key features

1. Fixes spelling, grammar and punctuation as you type
2. Shows the tone of your writing (formal, friendly, confident and more)
3. Rewrites full sentences with one click on the paid plan
4. Checks for plagiarism and AI generated text on the paid plan
5. Includes a style guide and brand tone settings for teams

Pricing

Pro comes with a 7 day free trial.

Best for: anyone who wants one tool that works in every app they already use. Students and office workers get the most value from the free plan.

2. QuillBot

QuillBot started as a paraphrasing tool and now bundles a grammar checker, plagiarism checker, AI detector, summarizer and translator in one place. More than 35 million writers use it, and the grammar checker works without creating an account.

Key features

1. Fixes grammar, spelling and punctuation in 6 languages
2. Paraphrases text in 9 modes such as Academic, Formal, Simple and Shorten
3. Plagiarism checker that covers 25,000 words a month on the paid plan
4. Tone insights and advanced writing suggestions on the paid plan
5. Works in Chrome, Edge, Safari, Word, Windows, macOS, Android and iOS

Pricing

There is no free trial, but Premium comes with a 3 day money back guarantee.

Best for: students and anyone who needs to fix grammar and rewrite sentences in the same tool at a lower price than Grammarly.

3. ProWritingAid

ProWritingAid goes deeper than a grammar check. It runs more than 25 reports on your writing, such as readability, overused words, sentence length, passive voice and pacing. It is built mainly for authors, bloggers and anyone writing long documents.

Key features

1. Grammar, spelling and punctuation checks in English (US, UK, Australian and Canadian)
2. 25 or more writing reports that show patterns across your whole text
3. Rephrase tool that makes a sentence formal, informal, longer or shorter
4. Custom style guide and dictionary so the tool follows your own rules
5. Compares your writing to 90 published fiction authors
6. Works in Google Docs, Word, Scrivener, the desktop editor and browsers

Pricing

Yearly and lifetime plans come with a 3 day money back guarantee. Students get 25 percent off yearly plans.

Best for: fiction writers, bloggers and long form writers who want detailed feedback on style, not just grammar. The lifetime plan is a strong deal if you plan to use it for more than 3 years.

4. LanguageTool

LanguageTool is the best pick if you write in more than one language. It checks grammar, spelling and style in more than 30 languages, including English, German, French, Spanish, Dutch, Portuguese and Polish. It started as an open source project and still offers a free web editor.

One big change in 2026: since March 2026 the browser extension only works with a Premium plan. Free users can still use the grammar checker and paraphraser on the LanguageTool website.

Key features

1. Grammar, spelling and punctuation checks in 30 or more languages
2. Picky Mode that turns on extra style suggestions for long documents
3. Translation between more than 10 languages inside the editor
4. Personal style guide and dictionary so it learns your preferred spelling
5. Works in Chrome, Edge, Firefox, Safari, Word, Google Docs, Windows, macOS and iOS

Pricing

Premium comes with a 14 day free trial.

Best for: people who write in German, French, Spanish or other non English languages, and anyone who wants a privacy friendly tool with an open source engine.

5. Hemingway Editor

Hemingway Editor focuses on one thing: making your writing short and clear. The free web editor highlights long sentences in yellow and red, marks passive voice and adverbs, and gives your text a reading grade level. The paid Editor Plus adds AI that rewrites those sentences for you.

Key features

1. Color coded highlights for hard to read sentences, passive voice and weak words
2. Readability grade level score for the whole document
3. AI sentence rewrites and grammar fixes on the paid plan
4. Eight style options such as more formal, more friendly or shorter
5. Set a target reading level and the AI edits toward it
6. Does not store your documents and does not train AI on your writing

Pricing

Editor Plus comes with a 2 week free trial and no credit card is needed.

Best for: bloggers, marketers and anyone who tends to write long sentences. It is not a full grammar checker on the free plan, so pair it with another tool if you need spelling and grammar fixes for free.

6. Wordtune

Wordtune is built by AI21 Labs and is best known for its rewrite feature. You highlight a sentence and it gives you several ways to say the same thing, such as more casual, more formal, shorter or longer. Spelling and grammar checks are unlimited even on the free plan.

Key features

1. Unlimited spelling and grammar corrections on every plan, including free
2. Rewrites any sentence in a casual, formal, shorter or expanded style
3. Summarizes long articles, PDFs and YouTube videos
4. AI recommendations that improve vocabulary, clarity and fluency on paid plans
5. Works as a Chrome and Edge extension, in Google Docs, Gmail, Slack and on iOS

Pricing

Paid plans come with a 3 day free trial. Students, teachers and nonprofits get 30 percent off.

Best for: non native English speakers and anyone who knows what they want to say but struggles to phrase it well. The free plan is one of the few that gives unlimited grammar checks.

7. Ginger

Ginger is one of the older grammar checkers and is popular with non native English speakers. It corrects whole sentences at once instead of one word at a time, and it can read your text out loud so you can hear how it sounds.

Key features

1. Grammar, spelling and punctuation checks that look at the full sentence context
2. Rephrase tool that gives you alternative ways to write a sentence
3. Translates text into more than 40 languages
4. Text reader that speaks your writing back to you
5. Personal trainer that explains the mistakes you make most often
6. Works on Windows, Mac, Chrome, Safari, Edge, Word, Outlook and as a mobile keyboard on iOS and Android

Pricing

Prices are from the Capterra listing updated in 2026 and may vary by region or sale.

Best for: English learners who want a tool that explains mistakes and reads text aloud. It does not work in Google Docs and has no plagiarism checker, so it suits personal writing more than academic work.

How to Choose the Right Grammar Checker

Pick the tool based on what you write most, not on which one has the longest feature list.

Three quick tips before you pay:

• Start with the free plan. Every tool on this list has one, and for short emails and messages it is often enough.
• Pay yearly if you decide to upgrade. Monthly prices are 2 to 3 times higher across all seven tools.
• Check where it works. Ginger does not support Google Docs, and LanguageTool now needs a paid plan for its browser extension.

Final Thoughts

After using all seven of these tools on my own emails, blog posts and longer drafts, here is where I landed. Grammarly is the one I keep coming back to. It catches the most mistakes with the fewest false alarms, and it is already there in every app I open, so I never have to copy and paste my text anywhere. If I could only keep one tool, it would be this one.

QuillBot surprised me the most. I expected a paraphrasing gimmick and got a solid grammar checker with a rewrite tool I now use almost daily, at a lower price than Grammarly. Wordtune was close behind for the same reason, and its free plan with unlimited grammar checks is the best deal on this list.

ProWritingAid is the tool I open when I am editing something long. The reports showed me habits I did not know I had, such as starting too many sentences the same way. It is slower to use, so I would not run it on a quick email. Hemingway sits in the same category for me. It does one job, cutting long sentences, and it does that job better than anything else here.

LanguageTool and Ginger were the two I used the least, but for a clear reason. I write mostly in English, so I did not need 30 languages or a text reader. If you write in German or Spanish, or you are still learning English, both of them do things the other five cannot.

My advice is simple. Pick two free plans, paste in the same piece of writing and see which suggestions you actually accept. That is the tool worth paying for. For me that was Grammarly for everyday writing and ProWritingAid for anything over a thousand words.

All prices and features in this article were checked on October 15, 2026 against each tool's official pricing page. Prices may differ by region, student status or ongoing sales.