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The Code surface builds native mobile apps as Expo / React Native projects. Create a project with the mobile type and the same chat-driven workflow applies: describe the app, and the coding agent builds it in a dedicated mobile build environment while you watch a live preview in a device frame.

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The mobile preview

  • Device frames: the preview renders inside a device frame. A device picker, curated by form factor, lets you switch between phones and tablets, and the frame feeds real device safe-area insets into the preview so it matches on-device chrome. Apps render edge to edge.
  • Stable preview URL: the preview is pinned to a stable URL that survives sandbox restarts, so the address does not change under you between sessions.
  • Branded loading: your app shows a real splash screen with its own name and icon while loading, and that branding is committed to the project’s repository so it persists across rebuilds.
  • Build feedback: the preview auto-refreshes when a mobile build completes, with a chime so you notice.
When the agent pushes a fix to the project’s repository, use Pull from GitHub to bring it into the running preview; the app hot-reloads with the change.
Mobile projects always run in the dedicated mobile environment. If a project ever resumes onto the wrong environment type, it is detected and recreated automatically, so a mobile project never boots as a web project.

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Databases and storage

Mobile projects get the same on-demand infrastructure as web projects: when your app needs a database, a per-project serverless Postgres database is provisioned and wired into the environment. App file uploads go to private storage and are served through a proxy rather than public URLs.

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Publishing to the App Store

The mobile publish wizard prepares a complete store listing from your actual app, not from generic boilerplate.

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Store metadata

  • Listing copy is generated in two stages, first a brief and then the copy, grounded in the real app you built.
  • Your app’s existing icon is sourced from its repository automatically.
  • Generated metadata and assets are persisted per project, so they do not regenerate every time you reload the wizard.
  • If the wizard does not have enough context about the app, it shows a single “What is this app?” field to fill the gap.

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Screenshot Mode

Screenshot Mode captures store screenshots directly from your app’s live preview:
  • Capture any screen; screenshots are named automatically after the app screen they show.
  • Each capture comes in two variants: a clean screenshot with no device chrome, and a framed variant cropped to the device.
  • Screenshots are grouped by device class (iPhone and iPad, or Phone and Tablet), and tablet captures use their own store dimensions.
  • The generated pack includes per-screen captions written from the actual image content, styled with your app’s real brand colors.
Generating the full screenshot pack takes around 3 to 5 minutes; the wizard sets that expectation while it works.