Offline-First Capacitor Apps

Build apps that work seamlessly with or without internet connectivity.

When to Use This Skill

• User needs offline support
• User asks about data sync
• User wants caching
• User needs local database
• User has connectivity issues

Offline-First Architecture

┌─────────────────────────────────────────┐
│              UI Layer                    │
├─────────────────────────────────────────┤
│           Service Layer                  │
│  ┌─────────────┐  ┌─────────────────┐   │
│  │ Online Mode │  │ Offline Mode    │   │
│  └──────┬──────┘  └────────┬────────┘   │
├─────────┼──────────────────┼────────────┤
│         │    Sync Manager  │            │
│         └────────┬─────────┘            │
├──────────────────┼──────────────────────┤
│  ┌───────────────┴───────────────────┐  │
│  │         Local Database            │  │
│  │    (SQLite / IndexedDB)           │  │
│  └───────────────────────────────────┘  │
└─────────────────────────────────────────┘

Network Detection

Using Capacitor Network Plugin

bun add @capacitor/network
bunx cap sync

import { Network } from '@capacitor/network';

// Check current status
const status = await Network.getStatus();
console.log('Connected:', status.connected);
console.log('Connection type:', status.connectionType);

// Listen for changes
Network.addListener('networkStatusChange', (status) => {
  console.log('Network status changed:', status.connected);

  if (status.connected) {
    // Back online - sync data
    syncManager.syncPendingChanges();
  } else {
    // Offline - show indicator
    showOfflineIndicator();
  }
});

Network-Aware Service

import { Network } from '@capacitor/network';

class NetworkAwareService {
  private isOnline = true;

  constructor() {
    this.init();
  }

  private async init() {
    const status = await Network.getStatus();
    this.isOnline = status.connected;

    Network.addListener('networ...