StemStudio AI · iPhone and iPad

The first mobile IDE for StemJSON

Create, test and play with mobile features on the device they are made for, before you ship them.

Free. Coming soon on the App Store.

What it does

Describe what you need in plain words, and AI writes the StemJSON for the layout you picked: phone, tablet, widget or banner.

See and play with the result exactly as your users will. The Preview pane runs the module on the same runtime your app ships.

Ask AI agents for changes, or make the final touches by hand in the JSON editor. Every version is kept and can be restored.

Generate modules with the StemJSON MCP server in any AI tool, then import them to review, run and refine.

Add an OpenAI or Anthropic key. It is verified on save and stored encrypted. No sign-in required.

Export a .stem module. It runs on iOS and Android, rendered natively with SwiftUI and Jetpack Compose.

Add the StemJSON runtime package to your app, and use .stem modules to extend its native functionality without a release.

Scan to open TestFlight on your iPhone or iPad

Free. Coming soon on the App Store