Open Grammar Checker

AI-powered grammar checker with privacy-first design. Polish your writing instantly using your own OpenRouter API key.

✨ FREE AI GRAMMAR CHECKER Fix grammar, improve clarity, and polish your writing using powerful AI models — completely FREE. Open Grammar Checker connects to OpenRouter, giving you access to FREE AI models like Llama 3, Gemini Flash, Mistral, and more. No subscriptions. No hidden fees. No limits imposed by us. 🆓 WHY IT'S FREE OpenRouter offers many models with FREE tiers: • Llama 3.3 70B — Free • Gemini Flash — Free • Mistral 7B — Free • DeepSeek — Free • Qwen — Free • And many more! Just create a free OpenRouter account, grab your API key, and start improving your writing instantly. ⚡ HOW IT WORKS 1. Sign up free at openrouter.ai (takes 30 seconds) 2. Copy your API key and paste it in the extension 3. Select a free model 4. Paste your text → Click "Check Grammar" → Done! ✨ FEATURES • 30+ FREE AI Models — Choose from Llama, Gemini, Claude, GPT-4, Mistral, and more • Real-Time Streaming • Lightweight • No Account With Us — We don't require registration or sign-up 💡 PERFECT FOR • Students writing essays, papers, and assignments • Professionals drafting emails and reports • Content creators polishing posts and articles • Non-native speakers improving their English 🔒 YOUR DATA STAYS YOURS • Your API key is encrypted and stored locally on your device • We don't collect, store, or see your text • No tracking, no analytics, no data selling 💬 HOW MUCH DOES IT REALLY COST? $0 if you use free models like Llama 3.3 or Gemini Flash. If you want premium models (GPT-4, Claude), you pay OpenRouter directly. --- Free AI. Better writing. No catch.