LexAI - AI Writing Assistant

Grammar checking and writing assistance powered by your own LLM API key

LexAI is an AI-powered writing assistant that works on any webpage — powered by your own API key, with no account, no subscription, and no backend. Select text anywhere and instantly: ✍️ Fix Grammar — correct grammar, spelling, and punctuation 🔄 Rephrase — make it clearer and more professional ✂️ Shorten — cut the fluff while keeping the message 📖 Expand — add detail, context, and supporting points 💡 Explain — break down complex text into plain language ⚡ Make Prompt — turn a rough idea into a well-engineered AI prompt with the built-in Prompt Builder (choose style, persona, and output format) How you like it written Apply a writing style to any action — Formal, Casual, Academic, Creative, or Concise — from the floating toolbar or the right-click menu. Replace the selected text in place or copy the result, including "Copy as" reformatting (Markdown, lists, and more). Bring your own AI Connect your own API key from OpenAI, Anthropic, Groq, or OpenRouter (100+ models), and pick from a live model list right in the settings. You control which model runs and pay the provider directly — no middleman markup. Private by design 🔒 Your API key is encrypted and stored locally on your device. 🚫 No account, no telemetry, no LexAI servers — your text goes only to the AI provider you choose, and nowhere else. Works in text boxes, email composers, forms, and editable content across the web. Also includes a popup editor for quick one-off text without leaving your current tab.