Mobile App Development

Native, cross-platform and web apps

Compare native, React Native, Flutter and web-based (PWA) apps, and learn how to choose between them by team skills, app needs and budget. Know what Expo is before you start building.

Start an app with Expo (React Native)

Create an Expo app, run it on your own phone with Expo Go, and build a first screen with View, Text and Pressable. Learn how React Native differs from HTML and CSS on the web.

Building screens: layout, styling and lists

Build the Brew & Bean menu screen with flexbox layout, StyleSheet styling, a reusable component, search and category filters, and a FlatList that stays fast with long lists.

Navigation with Expo Router

Add tabs, a stack and a dynamic detail screen to the Brew & Bean app using Expo Router: file-based routes, layouts, route params, Link and router.push, and how deep links work.

Calling APIs and storing data on the device

Load the Brew & Bean menu from an API with loading, error and refresh states, save a cart on the device with AsyncStorage, and send the order to the server. Learn where each kind of data belongs.

Device features: camera, location and notifications

Add a QR scanner, a distance-to-shop feature and a local notification to the Brew & Bean app with Expo. Learn how permissions work and how to handle refusals, plus what Expo Go can and cannot do.

Login and secure storage

Build a login flow in Expo: a login screen, a token saved in secure storage, routes only signed-in users can open, logout and session restore. Learn why tokens and secrets must never sit in plain storage.

Offline support and performance

Make your app useful on weak or missing networks: detect connectivity, cache data, keep user data in a local database, sync later, and keep lists and images fast on budget Android phones.

Flutter in one lesson: how it compares

See what Flutter is, how it renders differently from React Native, how the same screen looks in both, and how to choose between Flutter, React Native and fully native for a real project.

Build and publish to the Play Store

Take an Expo app to the Google Play Store: set the app identity, build an APK and an AAB with EAS Build, test on a real phone, set up Play Console, pass the testing rules and release updates.

Project: expense tracker app

Build Paisa, an offline expense tracker with Expo Router, SQLite, an add form with validation and a monthly summary by category. Then extend it and ship it to your phone.

Adding AI features to a mobile app

Add an AI feature to an Expo app the safe way: a small backend holds the API key, validates the model's reply and limits usage, while the app shows loading, error and result states.