Top pick
Grammarly
Writing & Translation4.3
Fixes grammar, clarity and tone in your writing, wherever you type.
Best for: Proofreading emails and documents as you type
Top picks
Best AI grammar checker
A grammar checker catches spelling, grammar and punctuation mistakes as you write, in emails, docs and social posts.
Picked by Sam Despo on
Why Grammarly is the top pick
It is the most widely used writing checker, and it works live in nearly every app you type in.
- Catches mistakes and awkward phrasing live in Gmail, Outlook, Word, Google Docs, Slack and the browser.
- Free covers spelling, grammar and 100 AI prompts a month. Pro is $12 a month billed yearly, or about $30 month to month, and adds rewrites, tone changes and plagiarism checks.
- Better as a live checker than QuillBot; worse than Claude or ChatGPT for writing whole drafts.
- The company is now called Superhuman, but Grammarly keeps its name. The paid Superhuman bundles include Grammarly with the Superhuman email app and Coda.
- Accepting every suggestion can make you sound generic. Treat it as a proofreader, not an author.
Other tools that do this job
Rewords, fixes grammar and summarises text, with an AI checker and humaniser built in.
Translates text, whole documents and live conversations, with natural-sounding results.
Questions
What is the best AI grammar checker?
Grammarly is the top pick. It is the most widely used writing checker, and it works live in nearly every app you type in.
Is there a free AI grammar checker?
Yes. Grammarly has a free option. There's a free plan, and paid plans start at $12/member/mo.
How much does Grammarly cost?
There's a free plan, and paid plans start at $12/member/mo.
What are the alternatives to Grammarly?
Other good options are QuillBot and DeepL. QuillBot is best for rewording a sentence or paragraph.