Your app starts
right here.

A Mac workspace for building native apps with your AI agent. Shape the screens, see every change and take your project all the way to a build.

Join the preview

For Mac. Build for iOS, Android and web.

Appmost workspace showing Still Horizon’s music app on folded iPhone Duo — Explore iPhone Duo

Connect services.
Add your logic.

Connect your app to integrations, build reusable functions and manage the state behind each screen. Shape the interface and the behavior together, with your project open beside you.

Still Horizon’s Integrations workspace in Appmost, showing the available service integrations — Explore integrations for backends, analytics, purchases and device features, then configure the services your app needs.

Reusable functions in Still Horizon’s Appmost Functions workspace — Define reusable functions and call them from your app’s actions to keep shared behavior in one place.

Still Horizon’s app state in Appmost’s Variables workspace — Use Variables to manage app state, from saved favorites and selections to the values that drive your screens.

Still Horizon in Appmost with the Add component side panel open beside the music app preview — Add labels, images, buttons and controls while keeping the screen in view.

A little screen.
A bigger possibility.

Open it. Fold it. See how your app adapts. Explore the same design on a compact screen and a wider canvas with Appmost’s 3D iPhone Duo preview.

Explore the Duo preview

Genuine Appmost export: Still Horizon’s music artwork, player and navigation in the expanded iPhone Duo preview — The expanded preview gives the album artwork and listening library more space.

Genuine Appmost export: the Still Horizon design partway through the 3D iPhone Duo fold preview — Inspect a folding pose with Appmost’s 3D preview controls.

Genuine Appmost export: Still Horizon in the compact iPhone Duo preview with its color settings open on the right — Still Horizon in a compact layout, with its color settings open in Appmost.

One project.
Ready to go further.

Take the same project to iOS, Android and the web. Build includes internal TestFlight testing, Firebase App Distribution for Android, and live web publishing. Public App Store releases and Google Play publishing require Production, which is coming later.

Appmost’s iOS Publish workspace showing the Appmost Demo organisation, signing setup and Build and publish to TestFlight action — Prepare signing and send an iOS build for internal TestFlight testing with Build. Public releases require Production, coming later. TestFlight upload guide.

Appmost’s Android Publish workspace showing Google Play internal testing, the Appmost Demo organisation, signing readiness and Build and publish to Google Play action — Firebase App Distribution is included with Build. Google Play publishing, shown here, requires Production and is coming later.

Appmost’s Web Publish workspace showing an Appmost account and Firebase project, a demo Hosting destination and Publish website action — Choose a connected account, Firebase project and Hosting site, then publish your web app.

Your favorite agent.
Your own app.

Connect Codex or Claude Code to Appmost and review changes in the native preview.

Enable External Agents in Appmost’s settings. Run the command in Terminal on the same Mac, then restart your agent.

OpenAI Codex

codex mcp add appmost --url http://127.0.0.1:48733/mcp

Codex setup guide

Claude Code

claude mcp add --transport http appmost http://127.0.0.1:48733/mcp

Claude Code setup guide

Requires the agent’s CLI and Appmost’s default port. For a custom port, copy the command from Appmost. Claude Code uses the current project directory.

What will you make?

Join the preview list for access to Appmost and news about the launch. Early access is free through December 31, 2026. No credit card required.

Your app startsright here.

Connect services.Add your logic.

A little screen.A bigger possibility.

One project.Ready to go further.

Your favorite agent.Your own app.