Vibe coding means you describe an app in plain words and an AI writes the code for you. It is fast and fun. But a vague request often gives you nice-looking screens that don't work together.

This guide shows a simple path from your first prompt to an app running on your phone. You don't need to write code. You only need to make a few clear decisions along the way.

Key takeaways

Start with a short brief: what the app does, who it's for, the first screens and the look.
Review the preview like a real user, then ask for one change at a time.
Put keys and passwords in Connections, never in the chat.
Test a real build on a real phone before you call the app done.

A timelapse of the FluxNative editor building a habit tracker: the agent writes a checklist, the preview changes from a starter screen to a Progress tab, a habit detail screen and the finished Today screen. — One brief, one turn: the agent plans a checklist, builds each screen, checks it in the live preview, and stops when every journey works.

1. Write a short brief

Your first prompt sets the direction for everything after it. "Build a fitness app" is too vague. The AI has to guess who uses the app and what happens when they tap.

A good brief answers four questions:

What does the app do?
Who is it for?
Which screens come first?
How should it feel? Think mood, color and style.

Here is an example you can copy and change:

A habit tracker for students. Home lists today's habits with a check button. A habit detail screen shows a 30-day streak calendar. A stats tab shows weekly progress. Calm, friendly look with a green accent. No sign-in yet.

A chat message with four highlighted parts, matched to four labels: job, who, screens and look. — A good brief answers four questions: what the app does, who it's for, which screens come first, and how it should feel.

Your first app starts in a short wizard: describe the idea, add a few optional details such as who the app is for, pick a look, then press Generate app. Later apps start from the prompt box on your dashboard.

The first-app wizard in three steps: describe the idea, add optional details such as who it's for, then pick a look and press Generate app. — Your first app starts in a short wizard: the idea in your own words, a few optional details, then a look and Generate app.

The FluxNative assistant then writes a real Expo and React Native project in TypeScript. It plans the work as a checklist, builds one screen after another, and the live preview updates as it goes.

2. Review the preview like a user

While the assistant works, it uses the preview itself to check its screens, so the preview is locked. When the turn ends, it's your turn.

Tap through the app the way a real user would. Don't just look at the colors. Ask yourself:

Can I finish the main task from start to end?
Does every button do something?
What do I see when there is no data yet?
Does it still fit on a small phone and on a tablet?

Click a screen in the Screens list to open it, or use the route picker to jump straight to a route. The device picker switches between phone and tablet sizes.

The editor's screens list and preview toolbar, with the route picker, the device picker and the Ready status marked. — When the turn ends, the preview is yours: open any screen, switch the route or the device, and tap through it like a user.

3. Change one thing at a time

Vague feedback gets vague results. A good change request names the screen, says what's wrong, and says what to keep. For example:

On the habit detail screen, make the streak calendar bigger and show the current streak above it. Keep the rest as it is.

The assistant makes the change, checks it in the preview, and tells you which files it touched.

A change request typed into the chat, the agent working and checking the preview, then the habit detail screen with a bigger calendar, a current streak card and an Undo button. — One clear request: the agent changes two files, checks the result in the preview, and leaves an Undo on the turn.

Every change is saved as a revision. If a change goes the wrong way, press Undo on that turn and ask again more clearly. That's easier than piling fixes on top of a bad change.

4. Connect real data safely

Sample data is fine for a first version. When you need accounts and saved data, connect a backend: Supabase, Firebase, Appwrite, Cloudflare or your own API.

Click Server in the project bar to open Connections. Choose your backend under Backend, paste its values and press Save and test. Then tell the assistant in chat to use that connection. It creates the tables and functions without ever seeing the secret values.

Never paste a key, token or password into the chat, not even as an example.

The Connections window: Backend, Monetization and API keys & secrets tabs, and the backends Supabase, Firebase, Appwrite, Cloudflare and HTTP API. — Server opens Connections. Keys are entered there once and stored encrypted, never in the chat.

5. Build it and test it on your phone

The preview runs in a web browser. It can't prove that the camera, notifications, purchases or sign-in work on a real phone. For that you need a native build.

Click Build in the project bar. FluxNative makes a signed app on its own build machines, so you don't need a Mac, Xcode or Android Studio.

Android: build an Installable APK. When it's ready, scan its QR code with your phone and install it. The link works for one hour.
iPhone: build an IPA and send it to TestFlight from Publish, then install it with Apple's TestFlight app. You need an Apple Developer account for this.
Test the real thing: the main flow, sign-in, permissions, and what happens on a bad network.

A build is charged only when it succeeds. Native builds are on paid plans (Creator and up).

The Build window for Android: Android and iOS tabs, Installable APK and Play Store AAB with their credit prices, and the version and build number fields. — The Build window: pick the platform and the file, check the version, and FluxNative compiles a signed app for you.

Frequently asked questions

Is vibe coding the same as making a mockup?

No. With FluxNative you get a real Expo and React Native project. You can preview it, edit it, export it and build it into an app for the stores.

Do I need to know how to code?

No. You can build the whole app in chat and in the Design tab. If you do code, every file is open in Code, and you can export the full project at any time.

Can I start from a template instead?

Yes. Templates are complete, working apps. Forking one gives you your own copy, with a setup checklist and ready-made prompts for the steps that remain.

Keep exploring

Quickstart — Go from sign-up to an app on your phone in a few minutes.
Write better prompts — Simple patterns for clear briefs and follow-up requests.
Install and test on a device — What to check on a real phone before you publish.

Vibe Coding a Mobile App From Prompt to Phone