Baby 4.0 Mobile App Creator: From Prompt to App Store
What we're doing at Brainbaby Labs to take you from a one-line prompt to a real React Native app running on your phone — and into the App Store.
Baby 4.0 Mobile App Creator: From Prompt to App Store
TL;DR: Describe an app in one sentence. Baby 4.0 writes a real React Native + Expo project, shows it in a live phone-frame preview, lets you run it on your actual device via QR code, and helps you publish to the App Store and Google Play.
Real React Native, not a mockup
A lot of "AI app builders" generate a web page in a phone-shaped frame. Brainbaby's mobile creator generates actual React Native code on Expo — the same stack used by production apps you already have on your phone.
- Live preview renders your app with real React Native components in the browser.
- Run on device: scan a QR code and your app opens on your own phone in seconds via Expo Go.
- Own your code: export the full project any time. It's standard Expo — no lock-in.
Built to not break
The most common failure mode in AI app builders is the generated app crashing on first run. At Brainbaby Labs we attacked this directly:
- Style and syntax sanitizers catch the classic generation bugs before your preview ever loads.
- Self-healing preview: if something does error, the builder reads the exact error and patches the file scoped to that fix — automatically.
- Full-context edits: follow-up prompts edit your existing app instead of regenerating it from scratch.
Publish to the stores
When your app is ready, the Publish flow walks you through Expo Application Services (EAS): app icons (AI-generated if you want), bundle identifiers, and the build commands that produce store-ready binaries for the App Store and Google Play.
Brainbaby vs Rork
| Rork | Brainbaby | |
|---|---|---|
| React Native + Expo output | ✅ | ✅ |
| Live in-browser preview | ✅ | ✅ |
| Run on device via QR | ✅ | ✅ |
| Store publish guidance (EAS) | ✅ | ✅ |
| Part of full AI workspace (chat, slides, video) | ❌ | ✅ |
| Price | $20/mo minimum | Included from $5/mo |
FAQ
Do I need Xcode or Android Studio? No — EAS builds in the cloud. You need a developer account with Apple/Google to publish.
Can I bring my own designs? Yes, describe them or paste screenshots and Baby 4.0 matches the style.
What about backends? Generated apps can call any API; Supabase-style backends are on the Labs roadmap.