Lumio Browser

A Chromium web browser with Lumio AI built in. Lumio sits in a side panel next to the page. Ask it anything, or tell it what to do: it reads and operates web pages, and opens the web versions of apps like Excel, Word or Google Sheets in a tab. It works only inside the browser, and asks before it acts.

Download: lumio-co.online/browser · macOS 14+ (Apple silicon and Intel)

What it does

• An AI that does things. Lumio reads the page you're on, clicks, types, fills forms, scrolls and opens tabs, using real mouse and keyboard input. It stays in the browser: for Excel, Word, PowerPoint or Outlook it opens Microsoft 365 on the web, and Google Docs, Sheets and Gmail work the same way. It can't open desktop apps, run commands or change system settings.
• You stay in control. Three approval modes: Ask (confirm every action), Auto (browse on its own, still stopping for your OK before buying, sending, posting or deleting), Bypass. While Lumio works, the page glows blue with a Stop button. Esc stops it too.
• Task progress. For bigger jobs, Lumio keeps a checklist above the chat box and ticks off steps as it goes.
• Safe by design. Page content is treated as untrusted data, never as instructions. Lumio never types passwords, payment or ID details. It stops to confirm before anything irreversible.
• Runs on your Lumio plan. Sign in with a Lumio account and the AI runs on your plan. Every plan includes some use each week, Free too, and Go, Plus, Pro and Max include much more. It uses one fast, inexpensive model (GPT-6 Luna); you choose how hard it thinks (Low, Medium or High) right under the chat box.
• Everything a browser needs:
  • tabs, multiple windows, pinned tabs, incognito windows, find, zoom, downloads, and a PDF viewer;
  • history search with time-range clearing;
  • a bookmarks bar and bookmark manager;
  • site permissions, and importing from Chrome, Edge, Brave, Arc or Vivaldi;
  • translate pages in place with Lumio AI, and a reading mode that reads articles aloud;
  • Share: copy a link, a QR code made on your computer, send a tab to your other computers, screenshots you can mark up, and the Mac's share sheet;
  • media controls in the toolbar for every tab that plays, with Picture in picture;
  • install sites as apps in their own window, with a launcher in Applications on the Mac;
  • Chrome extensions from the Chrome Web Store;
  • a password manager that saves, fills, generates, and imports or exports CSV, encrypted with your system keychain;
  • autofill for addresses, payment cards (filled only after Touch ID or Windows Hello; security codes are never saved) and earlier form entries, plus passkeys and security keys;
  • updates in one click: when a new release is out, a blue Update button appears next to your profile picture.

Install

Mac: open the .dmg and drag Lumio Browser to Applications. It's signed and notarized by Apple, so it opens like any other app (macOS asks once to confirm an app from the internet).

Lumio Browser is Mac only for now; copies already installed on Windows stay on 0.6.7.

Development

Requires Node 22+ and, for the Mac helper (Touch ID), Xcode command-line tools.

npm install
npm start                # run the app locally
npm test                 # unit tests
npm run test:e2e         # end-to-end tests (drive the real app)
npm run install:app      # build and install /Applications/Lumio Browser.app
npm run release          # dist/release: Mac DMGs (Apple silicon, Intel) and a Windows ZIP

How it's built

• Electron 43. Each tab is a WebContentsView, and each window has one shell page (renderer/ui) and one AI controller.
• Agent: main/ai holds the agent loop, the approval policy and the browser tools. The AI works only inside Lumio's tabs: the server offers no tools that act outside the browser, and for desktop apps the AI uses their web versions in a tab.
• Lumio account: main/account.js uses the lumio-co.online desktop sign-in hand-off. main/ai/lumio.js runs the AI through the account's plan (/api/browser/agent); the server owns the model, the tool definitions and the system prompt.
• Passwords: main/passwords.js and main/password-manager.js, plus the isolated preload in preload/internal.js. Each password is encrypted with Electron safeStorage. On the Mac, Touch ID goes through a small native helper (native/LumioHelper).
• Autofill: main/autofill.js and main/autofill-store.js (addresses, cards and form entries, encrypted with safeStorage), the session preload preload/autofill.js that finds form fields, and renderer/ui/overlay-autofill.js for the dropdown and the save bubble. Passkeys sync end-to-end encrypted through Lumio Sync; security keys use Chromium's own WebAuthn.
• While it works: main/ai/indicators.js (page glow and Stop bar). main/ai/tools/plan.js is the Task progress checklist.
• Updates: main/updater.js checks GitHub Releases, verifies the installer's SHA-256 and swaps the app in after it quits.
• Extensions: electron-chrome-extensions and electron-chrome-web-store. main/extensions-ui.js runs the puzzle-piece menu, pinned buttons, shortcuts and new tab page override; main/extension-access.js limits site access; main/extension-shims.js fills API gaps (see docs/extensions-support.md).
• Help and the Mac: main/help.js (Report an issue, which posts to the server's /api/feedback; lumio://version and lumio://flags-lite), main/menu-extras.js (Chrome's Mac menus), main/devtools.js (docking) and main/mac-integration.js (Handoff, Look Up).