LiteDB vs RxDB

LiteDB is a free, open-source, serverless .NET NoSQL document database distributed as a single DLL. It stores data in one file and supports ACID transactions, with WAL mode for recovery from write failures. Queries can use SQL-like commands or LINQ, and query EXPLAIN plans are available. LiteDB maps POCO classes to BsonDocument and offers a fluent API for custom mapping. Its intended uses include mobile apps, desktop and local applications, application file formats, web applications, and per-user data stores. FileStorage can keep files and streams in the database, though each root BSON document has a documented 16 MB limit. LiteDB describes itself as thread-safe, with cross-collection transactions, no reader locks, and per-collection writer locks. Password-protected datafile encryption uses salted AES; the documentation specifies ECB mode and says changing or removing a password requires rebuilding the file. LiteDB is free for everyone, including commercial use, under the MIT License. It is installable through NuGet, and the project links to LiteDB.Studio as an administration tool.

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.