stag.build logostag.build

Design once.Test it in the real app.

Stag builds your design into your team's iOS and Android app, so you see it working before it reaches your developers. No code to learn.

Joining means you accept emails and the privacy policy.

Stag
iOS
Android
The order screen running in the iOS app
The same order screen running in the Android app

You're designing for two platforms at AI speed.

A product designer at a desk buried in paper, with a line of teammates waiting behind her

Everything, twice.

One design for iOS, another for Android, and a long thread about why they don't match.

Someone else builds it.

You hand off a Figma file and hope the app comes back the way you drew it.

Faster, every sprint.

Developers ship with AI now. The queue in front of you keeps growing.

Your design, in your real app. On both platforms.

  1. 1

    Once.

    Stag aligns your iOS and Android design systems inside the repositories. The code becomes the source of truth, and every change updates it.

    Stag setup showing where the iOS and Android brand colors disagree, with options to change iOS, change Android, change both, or keep the difference
  2. 2

    Explore.

    You prototype on the real app, not a picture of it.

    Stag ready for a request, with examples like showing the settings screen as it is today
  3. 3

    Build.

    You bring your Figma design, and Stag builds it in the real app on both platforms.

    Stag after adding the discount from a Figma reference to the iOS order screen
  4. 4

    Check.

    You see it with your own eyes: the states, the transitions, the edge cases.

    The same order screen running on Android with the new discount row
  5. 5

    Hand off.

    You send a pull request. The developers start from a working UI in their own code and take it from there: logic, data, backend.

    Add the discount to the order screenFrom design · Ready for review
    • iOSOrderView.swift
    • AndroidOrderScreen.kt
    Next, the developers add
    LogicDataBackend

UI design: Coffee Shop Mobile App Design, Figma Community.

Questions

Do I need to know how to code?

No. You describe the change in plain words. Stag works in your team's repository and shows you previews of the real app.

Does it work with our existing app?

Yes. Stag works in your team's real iOS and Android repositories, not in a separate prototype.

What about Figma?

Bring your Figma frames as references. Stag uses them to build the real screen on each platform.

Do developers still review the work?

Yes. When it looks right, your work reaches them as a pull request in their own code. They start from a working UI, see exactly what changed, and adapt it for production before they merge.

What do I need to run it?

A Mac. Stag is a native macOS app, currently in private beta.

How do waitlist updates work?

We email you when your spot opens and when there are important product updates. You can unsubscribe anytime from the link in any email.

Design once. See it in the real app.

Join the private beta for mobile designers.

Join the beta