LexiLint

Spell-check entire webpages, not just input fields. Free AI grammar checking with your own Gemini API key. Offline & private.

Catch typos before your readers do. LexiLint is the first browser extension that spell-checks and grammar-checks entire webpages - articles, blog posts, documentation - not just input fields. Stop finding errors after publication. Catch them while reading. 🆕 v1.1.0: Multi-provider AI grammar checking + Premium multi-language support ✨ FEATURES FREE SPELL CHECKING (100% Offline) • Works on any webpage - no internet required • US & UK English dictionaries included • Custom dictionary - add technical terms, names, brand names • Zero tracking, zero data collection • Instant results with visual highlights FREE AI GRAMMAR CHECKING • Grammar, style, clarity, and punctuation checking • Powered by Google Gemini 2.5 Flash (free tier: 1500 requests/day) • Bring Your Own API Key (BYOK) - you control the data • Deterministic results - same page, same errors every time • Context-aware checking for headings, paragraphs, lists, quotes PREMIUM: MULTI-LANGUAGE SUPPORT (7 Languages) • Free tier: English (US & UK) • Premium tier: French, German, Polish, Russian, Turkish • $49 lifetime OR $4.99/month (7-day free trial) • Test all languages during trial period PREMIUM: ADVANCED AI PROVIDERS • OpenAI GPT-4 / GPT-4o - Industry-leading grammar analysis • Anthropic Claude 3.5 Sonnet - Advanced reasoning and style • Seamless provider switching • All providers use BYOK model (you provide your own API key) 🚀 HOW IT WORKS 1. Click the LexiLint icon in your browser toolbar 2. Click "Check Spelling" to scan the current page (offline, instant) 3. Click "Check Grammar" for AI-powered analysis (requires free API key) 4. Click on any highlighted error to see suggestions 5. Accept suggestions or add words to your custom dictionary 🎯 WHY LEXILINT? Competitors (Grammarly, LanguageTool) only work in input fields while you're typing. LexiLint is different: • Checks published content - Find errors in articles, docs, and blog posts BEFORE sharing • Works everywhere - News sites, GitHub READMEs, Medium articles, Notion pages • Privacy-first - Spell checking is 100% offline. Grammar checking uses YOUR API key with YOUR chosen provider • Free forever - Spell checking and Gemini grammar checking are always free • Premium options - Unlock 5 additional languages and advanced AI providers 🔧 CONFIGURATION Spelling Settings: • Choose from 7 language variants (2 free, 5 premium) • Manage custom dictionary words • Language auto-detection Grammar Settings: • Choose AI provider: Gemini (free), OpenAI (premium), or Claude (premium) • Get a free Gemini API key from Google AI Studio (https://aistudio.google.com/apikey) • Test connection to verify setup • Separate API key storage per provider Premium Settings: • Activate license key for premium features • License syncs across all your Chrome browsers • Manage subscription or lifetime access 🗺️ AI PROVIDER STATUS ✅ Google Gemini 2.5 Flash - Available (FREE - BYOK) ✅ OpenAI GPT-4 / GPT-4o - Available (Premium) ✅ Anthropic Claude 3.5 Sonnet - Available (Premium) 🚧 Local LLM - Coming soon (100% offline grammar checking!) Want a specific provider? Email us at lexilint@igniteapp.net 💎 PREMIUM FEATURES Unlock all languages and advanced AI providers: • 5 additional languages: French, German, Polish, Russian, Turkish • OpenAI GPT-4 and GPT-4o support • Anthropic Claude 3.5 Sonnet support • Multi-device license sync Pricing: • Lifetime access: $49 (one-time payment, no trial) • Monthly subscription: $4.99/month (7-day free trial, cancel anytime) Secure checkout via Polar.sh (powered by Stripe) 🔒 PRIVACY GUARANTEE LexiLint NEVER stores your data: • Spell checking: 100% offline, never leaves your device • Grammar checking: Text sent to YOUR chosen AI provider using YOUR API key • No tracking of your browsing or text content • Error logging (Sentry) excludes all user text, API keys, and personal data • API keys stored locally in Chrome's encrypted storage • License keys validated daily (only checks valid/invalid status) Full privacy policy: https://igniteapp.net/lexilint/privacy/ 💬 FEEDBACK & SUPPORT We're here to help: • Email: lexilint@igniteapp.net • Response time: Usually within 24 hours • Feature requests welcome! 🛠️ REQUIREMENTS • Chrome 90+ (for modern highlighting features) • For AI grammar checking: Free API key from your chosen provider - Google Gemini: https://aistudio.google.com/apikey (FREE) - OpenAI: https://platform.openai.com/api-keys (Premium) - Anthropic: https://console.anthropic.com/settings/keys (Premium) 📝 CHANGELOG v1.1.0 (Latest): • Multi-provider AI support (Gemini, OpenAI, Claude) • Premium multi-language support (7 languages total) • Polar.sh payment integration • Sentry error logging (privacy-first) • Improved error messages and UX --- Built with ❤️ for writers, developers, content creators, and anyone who reads on the web.