#LinkUp

A modern mobile chat and calling application built with React Native and Expo. LinkUp allows users to connect through real-time messaging, audio/video calls, profiles, LinkUp IDs, and privacy controls.

📱 Android APK

Download the latest Android APK:

Features

• 🔐 User authentication with Supabase
• 💬 Real-time messaging with Stream Chat
• 📞 Audio calling
• 🎥 Video calling
• 🔔 Incoming call notifications with Firebase FCM
• 👤 User profiles
• 🆔 Unique LinkUp ID for finding users
• 🔎 Search users by LinkUp ID
• 🚫 Block and unblock users
• 🔑 Change password
• 🖼️ Profile photo support
• 🌐 Internet connection detection
• 📱 Responsive mobile UI
• 💾 Local storage for blocked-user data
• ☁️ Supabase-powered profile and authentication system
• 🎨 Light, clean mobile interface

Tech Stack

• React Native
• Expo
• Expo Router
• JavaScript
• React Native Paper
• Supabase
• Stream Chat
• Stream Video
• Firebase Cloud Messaging
• AsyncStorage
• React Native WebRTC

Architecture

LinkUp uses different services for different responsibilities:

Supabase

Used for:

• Authentication
• User profiles
• LinkUp IDs
• Profile images
• User account data

Stream

Used for:

• Real-time chat
• Audio calls
• Video calls
• Call signaling
• Call-related functionality

Firebase

Used for:

• Android push notifications
• Incoming call notifications through FCM

Environment Variables

Create a .env file in the project root:

EXPO_PUBLIC_SUPABASE_URL=your_supabase_url
EXPO_PUBLIC_SUPABASE_PUBLISHABLE_KEY=
EXPO_PUBLIC_STREAM_API_KEY=

Use your own project credentials for each variable.

Never commit your .env file or Firebase configuration containing sensitive project credentials to GitHub.

Installation

Clone the repository:

git clone https://github.com/Amna-Coder404/LinkUp-chatapp.git
cd LinkUp-chatapp
npm install
npx expo start

Privacy & Security

LinkUp keeps authentication and profile data in Supabase while real-time communication is handled through Stream.

Local configuration files and Firebase configuration should not be committed to the repository.

Make sure to configure your own:

• Supabase project
• Stream project
• Firebase project
• Android application credentials

Current Status

LinkUp is an actively developed mobile application.

Current development focuses on:

• Chat experience
• Audio/video calling
• Call history
• Push notifications
• User privacy controls
• Profile management
• Offline/network handling