Grammarly checks spelling, grammar and tone as you type in your browser, email and documents, and adds AI prompts for drafting and rewriting. The free plan is worth installing for almost anyone who writes for work. Pro, at $12 a month billed yearly, is worth it if you want full sentence rewrites, tone adjustment and plagiarism checks; for drafting long pieces from scratch, a chat tool does more.
What Grammarly is
Grammarly is a writing assistant that works inside the apps where you already write. It offers a browser extension for Chrome, Safari, Firefox and Edge, desktop apps for Windows and Mac, and add ons for Microsoft Office and Google Docs Grammarly site ↗. As you type, it flags spelling and grammar mistakes and tells you how your writing sounds Grammarly plans ↗.
It has added generative AI on top of the checker. You can use prompts to draft or rewrite short pieces, and Pro includes Docs, an AI document editor, plus support in more than 20 languages with inline translation Grammarly Pro ↗.
Grammarly is now part of Superhuman, and its Enterprise plan is sold through Superhuman Go Grammarly Pro ↗. Grammarly says it has 40 million users and 50,000 organizations Grammarly Pro ↗.
What it does well
It catches mistakes where they happen. Because it runs in your browser and desktop apps, it checks the email you are about to send and the message you typed in a hurry, without copying text into a chatbot Grammarly site ↗. That is the main reason to install it.
The free plan is useful on its own. It corrects spelling and grammar, shows your writing tone and includes 100 generative AI prompts a month Grammarly plans ↗. For many people that is enough.
Pro adds real editing power. It rewrites full sentences, adjusts tone, helps with fluent English and inclusive language, checks citations and detects plagiarism and AI generated text Grammarly plans ↗. It raises the AI prompt allowance to 2,000 per member a month Grammarly plans ↗.
It suits small teams. Pro supports team accounts from 1 to 149 seats, with one style guide, one brand tone, snippets, a shared knowledge feature and team analytics Grammarly plans ↗ Grammarly Pro ↗. A brand tone helps keep everyone's emails sounding like the same company.
Enterprise has strong controls. It adds single sign on, SCIM, confidential mode, data loss prevention, audit logs and bring your own key encryption, with unlimited prompts Grammarly plans ↗.
Where it falls short
The free plan stops short of rewriting. Full sentence rewrites, tone adjustments, plagiarism checks and AI text detection are all unavailable on Free Grammarly plans ↗.
Monthly billing is expensive. Pro is $12 per member a month billed yearly, but $30 a month if you pay monthly Grammarly Pro ↗. The plans page shows $12 without saying it requires a yearly commitment Grammarly plans ↗.
It is a polishing tool, not a writer. Grammarly's prompts handle short pieces, but for drafting a full blog post or proposal from scratch, a chat tool like Claude or ChatGPT does more Claude pricing ↗ ChatGPT pricing ↗.
AI detection is not proof. Grammarly Pro includes AI text detection Grammarly plans ↗, but no detector is perfect. Treat a score as a hint, not a verdict.
Availability has wrinkles. Pro is rolling out gradually and is not available to Grammarly Business or Education customers, or to Premium customers who bought through the App Store or Google Play Grammarly Pro ↗. Hands on testing is in progress; we will update this review with results.
Pricing and plans
Grammarly has three plans, as listed in October 2026 Grammarly plans ↗ Grammarly Pro ↗.
Free is $0. It includes spelling and grammar correction, tone detection and 100 AI prompts a month, with help center support Grammarly plans ↗.
Pro is $12 per member a month billed yearly, or $30 per member a month billed monthly Grammarly Pro ↗. It adds rewrites, tone adjustment, fluency help, plagiarism and AI text detection, 2,000 AI prompts per member a month, one style guide, one brand tone, snippets and priority support Grammarly plans ↗. There is a 7 day free trial, and Grammarly emails a reminder 2 days before it ends Grammarly plans ↗.
Enterprise has custom pricing through sales. It includes unlimited prompts, unlimited style guides and brand tones, and advanced security controls Grammarly plans ↗.
You can pay by major credit card or PayPal Grammarly plans ↗. Educational institutions can ask about discounts Grammarly plans ↗.
Who should (and shouldn't) use it
- Good fit: anyone who writes emails and documents for work and wants fewer typos, using the free plan Grammarly plans ↗.
- Good fit: small teams that want one brand tone and style guide across everyone's writing Grammarly plans ↗.
- Good fit: non native English speakers who want fluency suggestions on Pro Grammarly plans ↗.
- Skip it if: you want an AI to write long drafts for you. A chat tool is better Claude pricing ↗.
- Skip it if: you will only pay monthly. $30 a month is steep for a checker Grammarly Pro ↗.
Alternatives worth a look
- Claude: a stronger drafting tool, with Pro at $20 a month Claude pricing ↗.
- ChatGPT: a free plan for everyday drafting and rewriting ChatGPT pricing ↗.
- QuillBot: a paraphrasing tool whose Premium plan also includes AI text detection QuillBot Premium ↗.
Where it appears
ComparedThe Best AI DetectorBest for writingThe Best AI Tools for StudentsBudget pickThe Best AI Writing ToolBest for fixing what you writeThe Best Free AI Writing ToolWhat’s good
- Works as you type
- 100 AI prompts a month free
- 7 day Pro trial
What to know
- No rewrites or plagiarism check on free
- Pro is $30 billed monthly
Key features
- Spelling and grammar corrections
- Tone detection
- Generative AI prompts
- Full sentence rewrites and tone adjustments on Pro
- Plagiarism and AI text detection on Pro
- Brand voice and style guides on Pro
Questions people ask
Is Grammarly free?
Yes. The free plan corrects spelling and grammar, shows your tone and includes 100 AI prompts a month Grammarly plans ↗.
How much is Grammarly Pro?
$12 per member a month billed yearly, or $30 billed monthly, with a 7 day free trial Grammarly plans ↗ Grammarly Pro ↗.
Is Grammarly worth paying for?
If you want rewrites, tone adjustment and plagiarism checks, yes. If you only need spelling and grammar fixes, the free plan covers that Grammarly plans ↗.
Does Grammarly have an AI detector?
Yes, on Pro and Enterprise. It is not available on the free plan Grammarly plans ↗.
Where this comes from
Checked Oct 9, 2026. Vendor pages describe their own products; independent sources add outside views. Hands on testing is in progress.
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