What it is
Grammarly checks spelling, grammar, punctuation and tone as you write, in browsers, desktop apps, Microsoft Office, Google Docs and on phones. It also rewrites sentences, generates text from prompts, and checks for plagiarism and AI-written text.
The company behind it renamed itself Superhuman in October 2025, putting Grammarly, the Coda docs app, Superhuman Mail and an assistant called Superhuman Go under one brand. Grammarly is still sold under its own name. Superhuman has kept buying: it completed the purchase of the AI detector GPTZero on 28 September 2026 and announced the acquisition of the Fathom meeting notetaker on 14 September 2026.
The plans are Free, Pro and Enterprise. Pro replaced the old Premium and Business plans and includes 2,000 AI prompts per member a month, plagiarism and AI-text detection, one style guide and one brand tone. Enterprise adds unlimited prompts, SAML SSO, SCIM, bring-your-own-key encryption and data loss prevention, and delivers Grammarly through Superhuman Go.
Our review
Grammarly's core job has not changed and it still does it better than anything else that runs everywhere: catching mistakes in email, chat, documents and web forms without being asked. For non-native English speakers and anyone writing a lot of business email, the free plan alone is worth installing. The weaker case is the paid AI layer. Full-sentence rewrites, tone shifts and drafting from prompts are now built into ChatGPT, Gemini in Workspace and Microsoft Copilot, often inside the same apps.
What Pro actually buys is narrower than the marketing suggests: 2,000 AI prompts per member a month against 100 on Free, plagiarism and AI-text detection, one shared style guide and one brand tone, and team analytics. The plans page shows Pro at $12 per member but does not show the monthly-billing price, so the real cost only appears at checkout. SAML SSO is not in Pro at all; it starts at Enterprise.
The data defaults split by how you buy, and this is the detail most teams miss. Grammarly's support docs say Product Improvement and Training is off, and cannot be switched on, for Enterprise, for Pro or Business bought through its sales team, and for Education accounts. For Free, Premium and self-serve Pro it is on by default, and on multi-user Pro only an admin can turn it off. A team that signs up with a card on the website starts out sharing its text for training. The certification list is long: SOC 2 Type 2, ISO 27001, 27017, 27018, 27701 and the AI-management standard ISO 42001, with HIPAA support only under a signed BAA.
Engineers should know there is nothing to integrate. Grammarly shut down its Text Editor SDK on 10 January 2024 and has not offered a grammar-checking API since; the Superhuman SDK announced at the rebrand is a closed beta for building agents. Meanwhile the parent's purchases point somewhere other than proofreading. GPTZero's detector is being folded into Superhuman Go and merged with Grammarly's Authorship tool, so Grammarly's future looks more like an authenticity and assistant suite than a better spellchecker.
Where it earns its place
A 30-person marketing team writing customer emails and web copy
Keep tone and terminology consistent across writers
Pro gives one shared style guide and one brand tone, 2,000 prompts per member a month and team analytics: 30 seats at the displayed $12 come to $4,320 a year. If bought self-serve, an admin must switch off Product Improvement and Training, which starts on.
An IT security lead rolling Grammarly out to 2,000 staff at a regulated firm
Approve a writing assistant that sees every email and document
Enterprise adds SAML SSO, SCIM, bring-your-own-key encryption, data loss prevention and an Audit Logs API, and training is off and locked. HIPAA use requires a signed BAA; pricing is by quote.
A university writing centre
Help students with grammar and check submissions for plagiarism and AI text
Education accounts have training off by default. Plagiarism and AI-text detection come with Pro and Enterprise, not Free, and Superhuman is combining Grammarly's Authorship tool with GPTZero's Replay. Detection results should prompt a conversation, not settle a misconduct case.
A product engineer adding spelling and grammar checks to an in-house editor
Embed a checker in a web app
Grammarly is not an option: its Text Editor SDK stopped working on 10 January 2024 and no public grammar API replaced it. Users can still run the browser extension over your app, but you get no control or logs.
Before you commit
- Setup
- Install the browser extension or desktop app and sign in; checks start in the next text field you type in. Enterprise rollout uses SAML SSO and SCIM provisioning.
- Integrations
- Browser extensions, Windows and Mac apps, Microsoft Office, Google Docs and phones. No public grammar API; Enterprise has an Audit Logs API.
- Data and privacy
- SOC 2 Type 2, SOC 3, ISO 27001, 27017, 27018, 27701 and 42001; HIPAA only with a BAA. Training is on by default for Free and self-serve Pro and off and locked for Enterprise, sales-sold and Education accounts; saved documents are kept until you delete them.
- Cost at scale
- At the displayed $12 per member, 100 Pro seats cost $14,400 a year. Organisations that need SSO or locked-off training move to Enterprise, which has no published price.
- Limits
- Free allows 100 AI prompts a month and Pro 2,000 per member; Pro has one style guide and one brand tone. Only Enterprise is unlimited.
What's good
- Works in nearly every app, browser field and office suite
- Accurate grammar and tone suggestions with explanations
- Free plan covers core checking with 100 AI prompts a month
- SOC 2 Type 2 plus ISO 27001, 27701 and 42001 certifications
- Training off by default for Enterprise, sales-sold and Education accounts
What's not
- AI rewriting is matched by chatbots many teams already pay for
- Self-serve accounts share text for training unless switched off
- Monthly-billing price not shown on the plans page
- SAML SSO only on Enterprise
- No developer API since the Text Editor SDK closed in January 2024
Best for
Professionals, students and non-native English writers who want error checking in every app.
Alternatives
Head to head
Grammarly: common questions
- Is Grammarly worth it?
- Grammarly is still the proofreader that follows you into every text box, but the AI writing it now sells is something your chatbot already does. We rate it 4.3 out of 5.
- How much does Grammarly cost?
- Free (100 AI prompts/month); Pro $12/member/month as displayed on the plans page (monthly-billing price not shown there); Enterprise custom.
- What are the downsides of Grammarly?
- AI rewriting is matched by chatbots many teams already pay for; self-serve accounts share text for training unless switched off; monthly-billing price not shown on the plans page; sAML SSO only on Enterprise; no developer API since the Text Editor SDK closed in January 2024.
- Who is Grammarly best for?
- Professionals, students and non-native English writers who want error checking in every app.
- How much does Grammarly cost for a team or in production?
- At the displayed $12 per member, 100 Pro seats cost $14,400 a year. Organisations that need SSO or locked-off training move to Enterprise, which has no published price.
- Is Grammarly safe for company data?
- SOC 2 Type 2, SOC 3, ISO 27001, 27017, 27018, 27701 and 42001; HIPAA only with a BAA. Training is on by default for Free and self-serve Pro and off and locked for Enterprise, sales-sold and Education accounts; saved documents are kept until you delete them.
- What are the best Grammarly alternatives?
- The closest alternatives we have reviewed are QuillBot, WRITER and Jasper.
Answers checked Oct 23, 2026.
Make Grammarly? Show this rating on your site
