About Prototo.

Prototo lets designers prototype natively for iPhone. You describe screens in plain language to Claude Code, and they run live on a real iOS Simulator, then on real iPhones. No Xcode knowledge, no handoff, no clickable mockup pretending to be an app.

Why it exists

Prototypes that look real are easy. Prototypes that run real are not. Native scrolling, haptics, live maps, real keyboards: the things that make an idea feel true only show up when the prototype is an actual app.

Prototo started as a personal tool to close that gap. Claude Code turned plain language into working native screens, and Prototo grew into the window around it: a Mac app that builds and publishes, share links that open on anyone’s iPhone, and Studio recordings for showing the work.

The pieces

• Prototo Desktop builds and publishes prototypes on your Mac, with Claude and a live Simulator in one window.
• Prototo for iPhone is the free viewer on the App Store. Anyone you share with runs your prototype natively.
• Studio turns recordings into clips framed in a 3D phone, ready for your portfolio or socials.
• The CLI underneath it all is open source under MIT, on GitHub.

Who makes it

Prototo is designed and built by Sherizan, a product designer and AI design lead. He has led design at Grab and TikTok, redesigned fintech products used by over 150 million people, and writes Design AI Stack, a playbook for designers using AI.

Prototo is what he wanted on his own desk: a way to go from idea to native app at the speed of a conversation.

Get in touch

Send us a message via the support page or find Prototo on X. We read everything.