Grammarly review: our take
Grammarly is an editor more than a drafter: it is best at catching mistakes and adjusting tone in text you already wrote, in almost every app where you type. The free plan covers spelling, grammar and tone with 100 AI prompts a month. Pro adds sentence rewrites, fluency, plagiarism and AI-text checks and 2,000 prompts.
Where the money goes depends on billing: Pro is $12 a month on a yearly plan, $60 a quarter, or $30 month to month, with a 7-day trial. Its AI detector is free, but Grammarly itself says no detector can prove AI use. For drafting long pieces, pair it with Claude or ChatGPT; for fiction, see Sudowrite.
By the Prompt Hackers team · facts checked 4 Oct 2026
What Grammarly does
Grammarly checks what you have already written for spelling, grammar and tone, in a desktop app, browser extensions, Microsoft Office, Google Docs and mobile keyboards. Pro adds full-sentence rewrites, tone adjustment, fluency suggestions, plagiarism and AI-text detection, and 2,000 generative AI prompts a month.
Who Grammarly is for
Best for
- people who write all day in email, docs and browser tabs
- non-native English writers who want fluency suggestions
- teams that need a shared style guide
Not for
- month-to-month users on a budget: Pro is $30 a month unless you commit to a year at $12 a month
- heavy AI drafting: the free plan has 100 prompts a month and Pro 2,000
- proving that you wrote a text: Grammarly's own FAQ says no detector can definitively conclude whether AI was used
Grammarly features
- F1Grammar and spelling checks
- F2Tone detection and adjustment
- F3Full-sentence rewrites
- Pro
- F4Generative AI prompts
- 100 free, 2,000 on Pro
- F5Plagiarism detection
- Pro
- F6AI-text detection
- F7Style guides and brand tones for teams
- F8Works in Google Docs, Microsoft Office and browsers
Grammarly pricing and plans
| Plan | Monthly | Billed yearly, per month | What it includes |
|---|---|---|---|
| Free | $0 | — | spelling and grammar fixes, tone detection, 100 AI prompts a month |
| Pro | $30 | $12 | full-sentence rewrites, tone adjustment, fluency, plagiarism and AI-text detection, 2,000 AI prompts a month; 1 to 149 seats; also $60 per quarter |
| Enterprise | — | — | custom pricing; unlimited members and AI prompts, confidential mode, data loss prevention |
Free plan: yes. Free trial: 7 days. Prices as listed by the vendor in USD, before tax; they change, so check the pricing page before you buy.
Grammarly FAQ
- How much does Grammarly cost?
- Paid plans start at $30/mo, with a discount for yearly billing. Prices checked on 4 Oct 2026.
- Does Grammarly have a free plan?
- Yes, Grammarly has a free plan.
- What are the alternatives to Grammarly?
- Tools that cover the same jobs include Claude, ChatGPT, Sudowrite, Jasper.