Task
Best AI tools to check grammar
We compared 2 AI tools to check grammar. All 2 have a free plan. Grammarly ranks first on our task-fit signals: spelling and grammar correction plus proofreading for structure and clarity runs inside desktop apps, browsers, MS Office and Google Docs. Listings were last checked on Nov 6, 2026.
Grammar checkers flag spelling, grammar and style problems as you type. Compare where they work (browser, desktop apps, Word, Google Docs, mobile keyboard), which corrections are free, and whether they support the languages and English variants you write in.
Preview build: this list has 2 of the 8+ tools a task page needs before it can be published (methodology, coverage rule).
The ranking
- 1
Grammarly
FreemiumFree plan availableWhy it fits: Spelling and grammar correction plus proofreading for structure and clarity runs inside desktop apps, browsers, MS Office and Google Docs.
Fit score 8/9: The task is the tool's first-listed use case; The tool's primary category matches the task's category; Five or more verified features; A free plan is available (stated on its pricing page)
- 2
QuillBot
FreemiumFree plan availableWhy it fits: Its grammar and spelling checker sits beside a paraphraser, so you can fix errors and reword sentences in one place.
Fit score 8/9: The task is the tool's first-listed use case; The tool's primary category matches the task's category; Five or more verified features; A free plan is available (stated on its pricing page)
Side-by-side
Choosing a tool to check grammar: what the data says
- Free to try: Grammarly and QuillBot have a free plan.
- Prices not verified: Grammarly and QuillBot. Their pricing pages couldn't be read, so we show no figure rather than a guess.
- On your phone: Grammarly and QuillBot list an iOS or Android app.
Order is by fit score, from published signals; ties go alphabetically and no tool can pay for a position. How the score works.