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Every design tool today puts AI on top of a canvas. Prototo removes the canvas. Describe a screen in plain language and it renders as a real native iOS app, not a webview mockup. Prototo Desktop puts Claude Code and the iPhone Simulator side by side in one window. No terminal, no commands, no file to touch. Publish turns any prototype into a link. Recipients open it in the free Prototo app and the prototype runs natively on their own iPhone, real gestures, real haptics, real Liquid Glass.
Hey everyone, it's Sherizan, the creator of Prototo. Stoked to be sharing this with you.
Prototo came from a problem I kept hitting. Every time I wanted to prototype something native with real gestures, real scroll physics, actual Liquid Glass, I had two options. Fake it in Figma or hand it to an engineer and wait. Neither felt right.
The gap was obvious once I saw it. Nothing existed for a designer who wanted genuine native fidelity, prompt-only, without opening Xcode. Figma Make renders through a webview. Expo and SwiftUI are built for developers.
So I built the thing I needed. First as a proof of concept.
One terminal command. The iOS Simulator opened. You described a screen to Claude Code in plain language, it appeared. No canvas, no file to touch. I wanted to see if the idea even worked before building anything bigger.
It worked. 5,500+ npm installs, no marketing. Designers started sharing videos of their prototypes running in the Simulator. That was the signal.
So I built Prototo Desktop.
One window now. Claude Code on one side, the iPhone Simulator on the other. Same interaction model, describe and it appears, but no terminal, no commands to remember.
The part I'm actually proud of is Publish. One button turns a prototype into a link. Anyone opens it on their own iPhone through the Prototo app, no build, no export, and it runs natively on their device.
Getting a prototype off your machine and onto someone else's phone, running for real, not a screen recording, not a webview, is a genuinely hard problem. That was the real work.
Simpler always wins.
@sherizan Congrats on the launch!
@kutlwano_melamu thank you so much!
How does publishing actually work behind the scenes when someone opens the link in the Prototo app, does it stream the UI definition or does the app pull down a full bundle first?
@feride188591 Great question. From the viewer’s side it’s designed to feel instant, you open the link, sign in, and the prototype is just running natively on your phone, real gestures and all.
The “how” is what makes Prototo possible and most of the development that went into.
Have you considered adding a way for recipients to leave timestamped comments or annotations directly on the prototype? Like, tapping and holding a screen to drop a note that the maker can see in their dashboard. Would make async feedback way less painful than stitching screenshots into a doc.
@agackesen72622 good idea. We have a few ways to do it and will be in our next iteration.
Afterplay
Very nice product! Last week I spent a lot of xcode configuration and installing & bugfixing dependncies. With Prototo i didn't have this issue. Also the tools see my skills from Claude Code. Looking forward for next steps and more feature.
@mbalasinski Thanks Maciej, this means a lot. Hearing about the dependencies pain is the best feedback I could get. More coming soon!