Lumen AI — AI Sidebar Assistant

An AI assistant in your browser side panel. Bring your own API key — no subscription, no sign-up.

Lumen AI — Your Browser Sidebar AI Assistant Lumen AI is a lightweight AI assistant that lives in your browser sidebar. Read, ask questions and take notes all within the sidebar panel, no need to switch between multiple tabs. Use your existing AI model service: simply enter your own API Key to get started. No registration required, no subscription fees. All chat requests are sent directly from your browser to your chosen AI provider, without passing through our servers. ✨ Core Features - Ask questions about the current page or selected text, with multi-turn context support - One-click summarization of long articles and reports to extract key takeaways - Word-highlight translation and full-page translation, with side-by-side original and translated text - Quickly jot down notes while browsing to save ideas on the fly - Upload screenshots or images for AI to describe visuals and extract text from images - Detect audio and video resources on web pages and save them locally 🔒 Privacy & Data Your API Key is stored locally only in your browser and is only sent to your selected AI provider. Lumen AI has no backend servers. We do not collect or store your conversations or browsing data. You have full control over your content. 📖 How to Use 1. Shortcut to open sidebar: Alt+Q 2. Go to extension settings and enter the API Key from a supported AI provider 3. Start using immediately Shortcuts: - Screenshot with annotation: Windows Ctrl+Shift+S - Screenshot with annotation: macOS Cmd+Shift+S