Grammarly

Grammarly is a grammar, spelling and style checker that works in browsers, desktop apps and phones, with a free tier and a paid Pro plan.

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At a glance

Price: Free tier, paid from $144/yr (Pro is $144/year ($12/month average); $60 per quarter or $30 billed monthly.)
Platforms: Web, Windows, Mac, Chrome extension, iOS, Android
Outputs KDP-ready files: No
Touches your KDP account: No
Categories: Editing & Proofreading
Last checked: 2026-11-09

Summary

Grammarly flags spelling, grammar, clarity and tone issues as you write and can rewrite sentences, check for accidental plagiarism and generate text from prompts. It is built for general and business writing rather than fiction, is not a replacement for a human editor on a book manuscript, and is now part of Superhuman's software suite. Corrections and rewrites of your own text count as AI-assisted under KDP rules and need no disclosure, but text generated from prompts counts as AI-generated and must be disclosed.

Best for

Catching typos and grammar errors before a human edit

Pros

Works almost everywhere you type
Free tier covers basic spelling and grammar

Cons

Monthly billing costs more than twice the annual rate
Tuned for business writing; fiction style suggestions can be off

Alternatives

ProWritingAid: ProWritingAid is a grammar and style editor aimed at fiction and long-form writers that runs line-editing reports on whole manuscripts.
Hemingway Editor: Hemingway Editor is a readability checker that highlights long sentences, passive voice and weak words, with a free web version and paid AI rewrites.
Editorial Freelancers Association: The Editorial Freelancers Association is a US association of freelance editors whose free directory and job list help authors hire editors and proofreaders.

Sources

Facts on this page come from the vendor and these pages. Prices change; confirm on the vendor site.

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