Grammarly
AI writing assistant that checks grammar, clarity and tone as you type, in more than a million apps and websites.
Founded 2009
Some links on this page are affiliate links. If you buy through them we may earn a commission at no extra cost to you. This never affects our verdicts.
Grammarly is an AI writing assistant that checks grammar, spelling, clarity and tone as you type. It works in more than 1 million apps and websites through browser extensions, Windows and Mac apps, mobile apps, Microsoft Office and Google Docs. Founded in 2009, it is now part of Superhuman, the name its company took in October 2025 after buying Coda and Superhuman Mail.
The Free plan fixes mistakes, shows your tone and includes 100 AI prompts a month. Pro costs $12 per member a month billed yearly, or $30 month to month, for 1 to 149 seats. It adds full-sentence rewrites, tone adjustment, plagiarism and AI-text detection, 2,000 AI prompts per member a month, and team tools: one style guide, one brand tone, snippets and analytics. Enterprise adds unlimited prompts and members, SAML SSO and data loss prevention.
Best for
Individuals and teams of up to 149 people who write in many apps every day and want grammar, tone and clarity fixes, plagiarism checks and shared style rules, rather than long-form SEO content.
Pros
- Free plan with grammar and spelling checks, tone detection and 100 AI prompts a month
- Works in more than 1 million apps and sites, including Google Docs, Word, Gmail, Outlook and Slack
- Pro covers 1 to 149 seats at $12 per member a month billed yearly, with a style guide, a brand tone and snippets
- Pro adds plagiarism and AI-text detection; the plagiarism checker compares text with over 16 billion web pages and academic papers in ProQuest's databases
- AI agents such as Proofreader, Reader Reactions, Citation Finder and Humanizer; Grammarly says most of its agents can be tried on the free plan
Cons
- Pro costs $30 per member a month billed monthly, against $12 a month billed yearly
- Pro includes one style guide and one brand tone; more need Enterprise
- No SEO or keyword features are listed on any plan
- The APIs are only for Enterprise and Education admins, and SAML SSO and SCIM need Enterprise
- Pro caps AI text generation at 2,000 prompts per member a month
From our tests
Screenshots of Grammarly from our hands-on tests. Each links to the full-size image; the test name leads to the task, how we judged it and the other tool's result.
Pricing
| Plan | Monthly | Yearly (12-month total) |
|---|---|---|
| FreeFor individuals; grammar and spelling checks, tone detection, 100 AI prompts a month | Free Free plan | |
| ProPer member; $12/member/mo billed yearly ($144/yr) or $30 billed monthly; 1-149 seats; 2,000 AI prompts/member/mo | $30/mo | $144/yr ($12/mo) |
| EnterpriseContact sales; available through Superhuman Go; unlimited members and AI prompts, SAML SSO, SCIM, data loss prevention | Custom | |
Prices checked on .
Features
In AI writing tools
| Feature | Grammarly |
|---|---|
| Brand voice | Yes · Brand tones: 1 on Pro, unlimited on Enterprise; not on Free |
| SEO mode | No · No SEO or keyword features listed on any plan |
| Plagiarism check | Yes · In the app on Pro and Enterprise, not Free; also a web checker; 16B+ web pages and ProQuest academic papers |
| Templates | Partial · Snippets only: shared, on-brand messaging templates on Pro and Enterprise |
| Team seats | Yes · Pro 1 to 149 seats; Enterprise unlimited members |
| API | Partial · Enterprise and Education admins only: analytics, license, writing score, AI and plagiarism detection (beta) APIs |
| Word limits | Yes · AI prompts: 100/mo Free, 2,000/member/mo Pro, unlimited Enterprise |
| Free trial | Yes · Free plan; Pro trials offered periodically (a 7-day trial on the US plans page captured 2026-10-13) |
| Integrations | Yes · 1M+ apps and sites: Google Docs, Word, Gmail, Outlook, Slack, Salesforce, Jira and more |