According to AlphaMoat, as of 2026-09, the Chrome extension GemType has 246 users (+158.9% MoM), rated 5 (2 reviews) — ranked #2,956 of 9,324 AI browser extensions, and #245 of 744 in Writing.
What is GemType
Grammarly-style grammar checking and text refinement on any website, powered by the Gemini API (bring your own key). GemType is a free, open-source Grammarly alternative. It checks your grammar and spelling and rewrites your text as you type, on any website — powered by Google's Gemini AI and your own free API key. No account, no subscription, and no company server in the middle.
HOW IT WORKS
- Type in any text field on the web
- Mistakes get a wavy underline a second after you pause
- Click an underline to accept the fix (Ctrl/Cmd+Z always undoes it)
- After each fix, the surrounding sentence is automatically re-checked
REWRITE ON DEMAND Select any text and choose Improve, Fix grammar, Shorten, Formal, or Casual — from a floating toolbar or the right-click menu. Rewrites keep your meaning; corrections keep your exact wording.
BEYOND THE BROWSER GemType is also a Microsoft Word add-in and a desktop app for Mac, Windows, and Linux that works in any application.
BRING YOUR OWN KEY (FREE) GemType uses your personal Gemini API key from Google AI Studio — free tier, no credit card. Requests go directly from your browser to Google; we never see your text or your key.
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PRIVATE BY DESIGN
- No accounts, no tracking, no analytics
- Your key and settings stay on your device
- Your text is sent only to Google's Gemini API
- Fully open source, so you can verify exactly what it does
- Turn GemType off globally or per-site in one click
Works in your language — GemType auto-detects what you are writing, or you can pin a language in settings.
FAQ Is GemType free? Yes — it is free and open source, and it runs on your own free Gemini API key (no credit card). There is no subscription.
Where does my text go? Only to Google's Gemini API, using your own key. There is no GemType server, no account, and no analytics.
Why does it need access to the pages you visit? So it can check your writing in the text field you are using. It stays inactive until you focus a field, and you can disable any site in one click.
Free and open source (Apache-2.0). Made by Matily.
Extension profile
User Growth Trend
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+ CompareData month: 2026-09 · User counts and ratings come from public Chrome Web Store data, aggregated monthly. See methodology.