Beta · v0.4.5 · 1,094 weekly downloads

Prototype natively
no cap.

You describe what you want. It appears on your device. Claude Code is the design tool. Simulator is the canvas.

Prerequisites · Claude Code · Node 18+ · Xcode

01 / Speedrun

Fast setup, under 60 seconds

One terminal command, one tap on your iPhone. You're in the simulator before your coffee's cold. No Xcode wrangling after the first install.

02 / Pure rizz

Real native feel, built for craft

Real iOS gestures. Real haptics. Real native scrolling. The kind of fidelity that holds up in a design review, on the same stack production apps ship on (Expo UI on React Native).

03 / Loaded

The good stuff, wired in

Reanimated, easing curves, Skia, and Lottie are ready from day one. Drop in motion, run a Skia canvas, play a Lottie file. No npm hunting. No build wrangling.

Show your prototo

What people are protomaxxing.

A peek at what designers are making. Built something good? Send it in. The best ones land here.

See it in action

Watch a prototo come together.

Roadmap

What’s coming next?

  • Done

    Phase 3: Proto App (physical device)

    Open Proto on your iPhone, scan a QR, and your prototype lands on the device. Proto-branded, Liquid-Glass-capable, signed once via EAS Build with the native pieces baked in.

  • In progress

    Phase 4: Share + Scale (prototo.app)

    Share a prototype with a stakeholder in one tap. No account. No setup. Run proto share, hand over the link or QR, and the prototype opens for them via prototo.app.

  • Planned

    Phase 5: Graduate to real app

    Your project is already a real Expo SDK 55 app. Same screens/ and components/ structure as anything in production. When you're ready to ship: keep the file layout, swap placeholder data for real APIs, add auth, build with EAS, and send it to TestFlight.

  • Planned

    Phase 6: Android support

    One codebase, both platforms. Same prototypes, same prompts, running natively on Android alongside iOS.

Spotted a bug or got a feature in mind? Open an issue on GitHub →

Release notes

What we shipped lately.

May 28, 2026

  • FixedFixed broken placeholder images that stopped fresh projects from building.
  • FixedFixed a packaging issue that could break installs of new projects.

May 27, 2026

  • NewMotion, gestures, Lottie animations, and canvas drawing, built into every new prototype.
  • NewNew projects scaffold with a DESIGN.md so Claude Code follows your design system from the first prompt.
  • FixedDeep imports inside your project resolve correctly again.

May 26, 2026

  • ImprovedCleaner welcome screen with copy written for designers.
  • ImprovedCold launch drops you straight to your running dev servers.
  • FixedLive preview connects reliably on the same Wi-Fi network.

May 25, 2026

  • NewViewer mode: open a shared prototype straight from a link on your device.
  • NewReal app icon and splash screen.
  • FixedNew project setup works smoothly with the latest pnpm.

Preview on iPhone

Wanna lock in on your iPhone?

Preview your prototypes on a real iPhone native iOS 26 Liquid Glass, system haptics, real gestures. No Xcode beyond the one-time setup you already did.

You won’t find Prototo on the App Store. It’s a space for your ideas to live before they’re ready for the world, half-formed, in-progress, just for you. That kind of thing doesn’t belong on a public shelf. So we’ll get it onto your iPhone a different way. Takes about two minutes.

  1. 1. Get Prototo onto your iPhone

    Open this page on your iPhone if you’re reading on desktop, then tap the button below. It’ll take you to the install page.

    Install Prototo →Open this on your iPhone

  2. 2. Register your device (first time only)

    On your first install, you’ll be prompted to set up your device. Tap Register this device and follow the iOS prompt, Settings will open automatically, tap Allow, then Install. Takes about 30 seconds. You only do this once.

  3. 3. Install + preview your prototype

    Back at the install page, tap Install Prototo , the app downloads and appears on your home screen. Then in your Prototo project on Mac, run npx proto start, open Camera on your iPhone, point it at the QR in your terminal, tap the notification, your prototype loads in Prototo.

A few notes

  • Same Wi-Fi. iPhone and Mac on the same network when previewing.
  • iOS 26+. Required for Liquid Glass and other system materials.
  • First-time install: ~10–15 min wait after registering, while a fresh build is signed for your device. The Install button activates automatically when ready.

Start prototyping natively today.

You describe the screens. They appear in the Simulator. No canvas. No IDE. No engineering concepts. Fr.