Compare WatermelonDB and SQLite for sync‑heavy React Native apps, and see a quick setup example.

watermelondb-vs-sqlite.md

Insight

SQLite is the go‑to embedded database for many mobile apps, but its synchronous API can become a bottleneck when you need real‑time sync and complex queries. WatermelonDB, built on top of SQLite, moves heavy data processing to a background thread and offers built‑in lazy loading, making it ideal for large, sync‑heavy datasets. The trade‑off is a steeper learning curve and extra bundle size, but the UI stays buttery smooth even with thousands of records.

Example

import { Database } from '@nozbe/watermelondb';
import SQLiteAdapter from '@nozbe/watermelondb/adapters/sqlite';
import { mySchema } from './schema';
import { Task } from './models/Task';

const adapter = new SQLiteAdapter({ schema: mySchema });
export const db = new Database({
  adapter,
  modelClasses: [Task],
  actionsEnabled: true,
});

// Simple sync placeholder
await db.batch(
  db.collections.get('tasks').create(task => {
    task.title = 'Buy milk';
    task.completed = false;
  })
);

Takeaway

If your app deals with >10k rows, frequent background sync, or needs lazy loading, favor WatermelonDB. For simple CRUD or low‑volume data, SQLite’s native API remains the lighter choice.