WatermelonDB is a reactive & asynchronous database designed for powerful React and React Native apps. It is optimized for building complex applications, with its primary goal being real-world performance.

Features:

Performance and Scalability

• Instant Launch: WatermelonDB is engineered to launch your app instantly regardless of the amount of data it holds.

• High Scalability: It is highly scalable, capable of handling systems ranging from hundreds up to tens of thousands of records.

• Fast Operations: The tool is designed to be fast, with ongoing performance improvements in every release.

Data Handling and Architecture

• Lazy Loading: WatermelonDB resolves performance bottlenecks (especially when scaling to thousands of records) by being lazy. Nothing is loaded until it’s requested.

• SQLite Foundation: It is built on a rock-solid SQLite foundation. All querying is performed directly on the SQLite database on a separate native thread, ensuring that most queries resolve instantly.

• Relational Structure: The database is Relational. Developers can define models (like Post and Comment) and relationships using decorators.

• Offline-First: It supports an Offline-first approach, with functionality to sync data with your custom backend.

Reactivity and Observability

• Fully Observable: Unlike using SQLite directly, WatermelonDB is fully observable.

• Automatic Re-rendering: It is Reactive (offering an optional RxJS API). When a record is changed, added, or removed (even in a different part of the application), all dependent UI components will automatically re-render.

• React Optimization: It is Optimized for React, allowing users to easily plug data into components.

Compatibility and Standards

• Multiplatform: WatermelonDB is Multiplatform, supporting iOS, Android, Windows, web, and Node.js.

• Framework-Agnostic: While optimized for React, it is Framework-agnostic, meaning its JavaScript API can be used to plug into other UI frameworks.

• Static Typing: It supports Static typing via Flow or TypeScript.

• Open Source: WatermelonDB is an open-source project that encourages contribution. It is available under the MIT license.