iOS · iPadOS · Android · Desktop

ChatGPT & Codex live in a browser tab.
Sigmabrain lives on your desktop.

Sigmabrain installs as a full-screen app on every device you own — straight from the browser, no app store, no waiting. A native Tauri desktop app with embedded engine works offline. ChatGPT and Codex can't do that. Native store apps are on the way.

9:41 Σ
Sigmabrain
Ask your brain…

3 open commitments across 4 meetings this week —

⚠ Gap: Thu 2pm has no notes

Works offline

iPhone & iPad

Install via Safari in 10 seconds

  1. 1Open sigmabrain.com in Safari
  2. 2Tap the Share button (square with arrow)
  3. 3Tap “Add to Home Screen”
  4. 4Tap “Add” — done. Full-screen app with the Σ icon.

Works on iOS and iPadOS 16.4+. The app runs in standalone mode — no browser chrome.

Android

Chrome offers the install for you

  1. 1Open sigmabrain.com in Chrome
  2. 2Tap the “Install app” prompt (or menu ⋮ → “Add to Home screen”)
  3. 3Confirm — Sigmabrain appears in your app drawer
  4. 4Launches full-screen like any native app.

Also works in Edge, Samsung Internet and Firefox.

Desktop (Mac, Windows, Linux)

One click in Chrome or Edge

  1. 1Open sigmabrain.com in Chrome or Edge
  2. 2Click the install icon in the address bar (⊕ screen)
  3. 3Confirm — Sigmabrain opens in its own window
  4. 4Pin it to your Dock or taskbar.

App Store & Google Play

Native apps are in preparation — built on the same codebase via Capacitor, with push notifications, biometric unlock and a “Send to Sigmabrain” share extension.

Push notifications Biometric unlock “Send to Sigmabrain”

Coming soon to

App Store

Coming soon to

Google Play

Store availability follows the hosted-cloud launch (Apple requires a full account flow for review). Install the web app above today — it's the same product, and your account carries over.

Install questions

Is the installed app different from the website?

Same product, same account, same data. The install gives you a full-screen window, a home-screen icon, and an offline fallback. Native store versions will add push notifications and share extensions.

Does it work offline?

The app shell loads offline and tells you clearly when it can't reach your brain. Queries need a connection — your brain lives on your server or your EU cloud instance, not on the phone.

Is the mobile app secure?

It's the same hardened web app: encrypted transport, httpOnly session cookies, and your data never stored on the device beyond the session.

When do the store apps arrive?

After the hosted cloud is live — Apple's review requires a complete signup flow. The Capacitor build setup is already in the repository (mobile/README.md).

Install it now, thank yourself in the next meeting.

Set up in minutes, first answer the same day — on whatever device is in your hand.

Download — Sigmabrain on every device — Sigmabrain