Ditto vs RxDB

Ditto is a distributed database and Edge SDK for applications that must operate when networks are unreliable or unavailable. Its embedded database lets devices read and write offline, then synchronize through Bluetooth Low Energy, peer-to-peer Wi‑Fi, or a local area network without internet access or extra hardware. Devices using the SDK can form wireless mesh networks for real-time sharing in bandwidth-constrained environments. Ditto automatically resolves conflicts between peers and with the cloud when available. The platform supports Android, iOS, Windows, and Linux, with SDK languages including Swift, Kotlin, JavaScript, C#, C++, Rust, Flutter, and React Native. The Free plan costs nothing and includes 10 cloud device connections, 2GB storage, 5GB transfer, limited support, and no SLA.

RxDB is a NoSQL database for JavaScript that runs inside an application and keeps data locally on the client. It supports offline operation, including applications that run entirely without a backend. When synchronization is needed, its Sync Engine connects to backends including RxServer, GraphQL, Firebase, Supabase, MongoDB, NATS, HTTP, CouchDB, WebRTC, Appwrite, Google Drive, and Microsoft OneDrive. Observable queries update as stored data changes. RxDB runs in browsers, mobile apps, desktop applications, and servers, with storage options including LocalStorage, IndexedDB, OPFS, SQLite, Node.js Filesystem, Expo Filesystem, MongoDB, and FoundationDB, among others. Collections use JSON Schema with validation and migration support. An encryption plugin protects locally stored documents with a password in browsers, React Native, and Node.js. The free tier is under Apache 2.0 and allows up to 13 open collections in parallel. Free users get community support through GitHub and Discord; Enterprise includes an SLA with a 24-hour first response. Pro costs $99 a month billed annually, and Pro Plus costs $239 a month billed annually.