Get Prototo.

Build on your Mac. Runs native on any iPhone. You’ll be in the Simulator in under a minute.

For building and publishing

Prototo Desktop.

Describe your app to Claude or Codex and watch it build live in a real iOS Simulator: one window, no setup after the first install.

Download for Mac

macOS on Apple Silicon · needs Claude Code or Codex + Xcode

For sharing and viewing

Prototo Viewer.

This is the part nothing else can do. Send anyone a link and your prototype runs native on their iPhone. Real gestures, real haptics, the real thing. Free to download, free to view.

Get it on the App Store

iOS 26 or later