Best AI Grammar Checkers
This list is for students, job seekers, freelancers and professionals who write in English and want fewer mistakes in emails, assignments, proposals and posts. When choosing, look at how clearly the tool explains its corrections, whether it works in your browser or documents, and whether it handles tone, clarity and academic style as well as basic grammar. Free and freemium options are marked, so you can find a reliable checker without paying.
Free to start: Grammarly, ProWritingAid, QuillBot, Trinka AI, Wordtune
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Why it's here: Checks grammar and clarity, suggests tone changes and works across the apps and websites you use every day.
An AI writing assistant that checks grammar, adjusts tone and rewrites text across the apps and websites you use.
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Why it's here: Offers detailed grammar and style checks plus rephrase suggestions, and is described as useful for non-native speakers.
A writing assistant with grammar and style checks and a Rephrase tool that suggests clearer ways to say things.
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Why it's here: A writing assistant with a free tier that helps students and professionals produce clearer, correct text.
An AI writing assistant for students and professionals who want help producing clearer, better written text.
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Why it's here: A grammar checker focused on academic and technical writing, with a confidential data plan for sensitive documents.
An AI writing and grammar checker focused on academic and technical writing, with privacy-first options.
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Why it's here: Proofreads your English and suggests rewrites in formal or casual tone, handy after fixing basic errors.
An AI writing companion that rewrites, paraphrases and proofreads your English so it reads clearly in the right tone.
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Why it's here: Highlights hard-to-read sentences and adjusts grammar and tone, helping you make writing clearer as well as correct.
A writing editor that highlights hard-to-read sentences and helps you make your text clearer and bolder.
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Why it's here: Gives one-tap grammar fixes and style improvements in mobile and desktop apps, great for emails and messages.
An AI writing assistant that fixes grammar, improves style and drafts email replies wherever you write.
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Why it's here: A free tool that corrects grammar and changes tone with a wide choice of writing styles and instant results.
Rewrite AI fixes grammar and changes the tone of your text with a choice of over 30 writing styles.
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Why it's here: A free set of writing tools that includes a grammar checker, plagiarism check and citation generator for students.
A set of AI writing tools including an AI detector, humanizer, paraphraser, grammar checker and plagiarism checker.
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Why it's here: Catches grammar mistakes and improves readability, while also offering rewriting and AI content detection.
An AI writing assistant that detects AI content, rewrites and edits text, and catches grammar mistakes to make writing clearer.
Frequently asked questions
What is the best free grammar checker?
Several tools on this list are free or have a free tier that covers basic grammar and spelling. Try a few with your own writing and pick the one whose corrections are accurate and easy to understand.
Can grammar checkers make mistakes?
Yes. They sometimes flag correct sentences or miss errors, especially with names, technical terms or local expressions. Read each suggestion before accepting it rather than clicking accept on everything.
Is using a grammar checker allowed for assignments?
Most institutions allow basic spelling and grammar checks, but rules differ, especially for tools that rewrite whole paragraphs. Check your university's policy and use these tools to learn from your mistakes.
Do grammar checkers help improve my English?
They can, if you read the explanations and notice patterns in your mistakes. Over time you will make fewer errors. Combine them with reading and practice for the best progress.
More lists
Plans and features change often; confirm on each tool's official website. Last updated September 24, 2026.
