Join your lesson

Type the class code on your teacher's screen, or scan its QR code with your camera.

Already have an account? Sign in. Trying it out? Use the code TRYCAT.

• Works in the browser you already have — phone, tablet or laptop. Nothing to install.
• Light on data: after your first lesson the app's files stay on your device.
• On a shared device, use Sign out and clear this device in the menu when you finish.