Fix messages & emails instantly with AI. Multi-provider: Groq, Google Gemini, GitHub Models.
Users
6
−1 in 30 days
Rating
5.0 / 5
unchanged in 30 days
Ratings
4
0 in 30 days
Store rank
#227K
#190K among extensions
Version
2.1.6
updated 9 Apr 2026
Users
monthly, 6 months
Latest, 15 Oct 2026:6 usersMove the mouse over the chart for any month
Ratings count
monthly, 6 months
Latest, 15 Oct 2026:4 ratingsMove the mouse over the chart for any month
The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.
About GrammarGenius Pro
GrammarGenius Pro fixes your grammar, tone, and spelling
instantly — powered by free AI, with no subscription, no
server, and no data collection.
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💬 MESSAGE MODE
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Built for WhatsApp, Slack, Twitter, SMS, and any
short-form text.
- Fix Message — corrects grammar, spelling & punctuation
- Shorten — trims to the essential point
- Expand — adds detail and enriches phrasing
- Alternatives — gives 2 rephrased versions to pick from
- Changes Made — shows every correction applied, diff-style
Tones: Casual · Formal · Friendly · Assertive
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📧 EMAIL MODE
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Built for Gmail, Outlook, and professional correspondence.
- Fix Email — full grammar, tone & structure correction
- Rewrite — same intent, better phrasing, from scratch
- Shorten — condenses without losing the message
- Subject Line — AI-suggested subject generated instantly
- Smart Reply — suggested reply based on email context
Tones: Casual · Formal · Friendly · Assertive · Apologetic
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🤖 3 FREE AI PROVIDERS — AUTO FALLBACK
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Use any of three free AI providers — Groq, Google AI
Studio, or GitHub Models. Set your priority order. If one
fails or rate-limits you, the next kicks in automatically.
One free API key is all you need to get started.
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🔒 PRIVACY FIRST
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- Only one permission needed: storage
- No analytics, no telemetry, no tracking
- Your text goes only to the AI provider you configured
- API keys are stored locally and never leave your browser
- No account. No subscription. No data collection.
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✨ MORE FEATURES
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- Dark and light theme
- History panel — reload and re-fix previous inputs
- 10,000 character input with live counter
- Robust fallback — handles rate limits automatically
- Zero build step — lightweight and fast