# Build a mobile app

A complete example of building a cross-platform mobile app with GenVibe.

We'll build a **workout logger** for iOS and Android.

## 1. First prompt

Say "mobile app" so GenVibe scaffolds React Native + Expo:

> Build a mobile workout logger app. Bottom tab bar with two tabs: Log and History. On Log, I can pick an exercise, enter sets and reps, and save. History shows past workouts grouped by date. Clean, modern mobile design.

GenVibe builds the app and shows it in a **phone frame** preview.

## 2. Iterate

> Add a "+" button to create a custom exercise.

> Show a weekly summary card at the top of History with total workouts this week.

> When I save a workout, show a quick confirmation toast.

## 3. Persist data

Connect [Supabase](/integrations/supabase.md):

> Use Supabase to store workouts so they sync and persist, with email login so each user sees only their own data.

## 4. Test interactions

Use the device-frame preview to tap through tabs, add entries, and check navigation.

## 5. Ship to the stores

Export to [GitHub](/integrations/github.md), then use the standard **Expo** build and submit workflow (EAS) to publish to the App Store and Google Play.

{% hint style="success" %}
Building real mobile apps from a prompt is GenVibe's standout feature — and it's on the free tier.
{% endhint %}


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