Install the controller

The controller works straight from the browser, but you can also put it on your phone's home screen. It then opens like an app: full screen, no browser bars, always held sideways, and it remembers your name.

It is optional, it takes a few seconds, and nothing is downloaded from an app store.

On Android (Chrome)

1. Open app.ctrllr.com/play in Chrome.
2. Tap Install when Chrome offers it. If it doesn't, open Chrome's menu (⋮) and choose Add to Home screen or Install app.
3. Open CTRLLR from your home screen.

Once it is installed, scanning a game's code with your camera opens the installed controller directly.

Samsung Internet and Firefox work too: look for Add page to / Install in their menus.

On iPhone (Safari)

1. Open app.ctrllr.com/play in Safari.
2. Tap the Share button (on iOS 26, it is inside the ⋯ menu).
3. Choose Add to Home Screen, then Add.
4. Open CTRLLR from your home screen.

On iPhone, the camera always opens links in Safari, never in an installed app. So when you play with the installed CTRLLR, scan the game's code from inside CTRLLR (tap Scan to Play), not with the camera app.

In Chrome on iPhone, use the share button in the address bar, then Add to Home Screen.

From the controller itself

The controller has an Install button when installing is possible, and Settings → Install gives the steps for your phone. After a game, it may suggest installing for next time; "Not now" hides that for two weeks.

Removing it

Remove it like any app: press and hold the CTRLLR icon and choose Remove (iPhone) or Uninstall (Android).