I got tired of paying for Grammarly Premium every month, so I built a free alternative that runs entirely in the browser.
The Problem
Grammar checkers are everywhere, but most of them either:
- Require a subscription
- Send your text to their servers
- Need an internet connection
I wanted something I could use offline, without worrying about privacy.
What I Built
Grammar AI Check is a free, browser-based grammar checker that:
- Works offline — all processing happens locally
- No signup required — just paste and check
- Supports multiple languages — English, Spanish, French, German
- Privacy-first — your text never leaves your device
How It Works
The tool uses a combination of rule-based grammar patterns and local language models. I spent the most time tuning the false positive rate — there's nothing more annoying than a grammar checker that flags correct sentences.
Tech Stack
- Pure HTML/CSS/JS — no framework bloat
- Deployed on Cloudflare Pages for global edge delivery
- Local storage for user preferences
Why I Made It Free
I believe good writing tools should be accessible to everyone. Students, job seekers, and non-native speakers shouldn't have to pay $12/month just to write a decent email.
Try it out at grammaraicheck.com and let me know what you think in the comments.
What's the one grammar rule you always mess up? Mine is "who vs whom" — I've given up and just use "who" for everything now.
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