Lumen — AI DevTools Assistant

AI assistant built into Chrome DevTools. Inspect elements, debug errors, generate code, and run snippets directly on the page.

AI assistant in Chrome DevTools. Inspect elements, explain errors, run AI code on the page. Free account, local chat history. Lumen is an AI assistant built into Chrome DevTools. It sees the element you selected and the errors on your page, and one click runs its suggested code on the page. No API keys required. KEY FEATURES: • Run on page - execute AI-suggested JavaScript in the inspected page, only when you click • Attach context - selected element, console errors, page info or selected text • Live error capture with diagnosis and fix, plus Quick Fix popup • Page Scanner - accessibility, SEO, performance and HTML quality in one click • Smart Console - AI autocomplete for console snippets • Multi-turn chat with sessions, search and Markdown export • Gemini and OpenAI models, switch anytime • Chat history stored locally in your browser HOW IT WORKS: 1. Open DevTools (F12) and find the "Lumen" tab 2. Sign in with a free account 3. Add context and ask your question 4. Click "Run on page" to try the fix DATA & PRIVACY: Page context is sent only when you attach it or ask for an explanation. It goes through our server to the AI provider you selected (Google or OpenAI). We don't sell your data or use it for ads. Details: https://lumen-ai.online/privacy.html Free plan: 100 credits/month. Paid plans coming soon.