Last updated: 2026-06-22

Everything you'll touch while writing app code.

• Page Lifecycle - create, upgrade, rebuild, shutdown
• Display & UI System - containers, text, images, fonts on the 576×288 canvas
• Design Guidelines - typography, spacing, the green canvas
• Device APIs - touchpad taps, swipes, R1 ring, IMU, audio, location, photos, device/user info, local storage
• Networking - fetch, the app.json whitelist, CORS, request flow
• Background & Lifecycle - WebView suspension, what survives, what doesn't