The open source Firebase alternative. Supabase adds realtime and restful APIs to Postgres without a single line of code.

SapphireDb is described as 'Open source library that enables you to easily create your own application with realtime data synchronization. It extends your Asp.Net Core Application with EF Core and combines the advantages of firebase and .Net Core together' and is an app. There are more than 10 alternatives to SapphireDb for a variety of platforms, including Web-based, Self-Hosted, Windows, Linux and Android apps. The best SapphireDb alternative is Supabase, which is both free and Open Source. Other great apps like SapphireDb are Firebase, Prisma ORM, RxDB and Etebase.
The open source Firebase alternative. Supabase adds realtime and restful APIs to Postgres without a single line of code.

Firebase, provided by Google, is a backend service and application development platform. It uses AI, cloud infrastructure, and cross-platform SDKs for efficient app development. Firebase offers tools and infrastructure for app creation and business growth.


Prisma unlocks a new level of developer experience when working with databases thanks to its intuitive data model, automated migrations, type-safety & auto-completion.
RxDB (short for Reactive Database) is a NoSQL-database for JavaScript Applications like Websites, hybrid Apps, Electron-Apps and NodeJs. Reactive means that you can not only query the current state, but subscribe to all state-changes like the result of a query or even a single...

Instant is for building real-time and offline-enabled applications. We make it easy to build collaborative products like Notion or Figma.
Feathers is a real-time, micro-service web framework for NodeJS that gives you control over your data via RESTful resources, sockets and flexible plug-ins.
deepstream.io is a clusterable realtime server that handles persistent tcp and websocket connections. It offers data-sync, pub/sub and request/response. It's available for Linux, Mac and Windows and comes with clients in JS, Java and many others.
restdb.io is a Plug-and-Play Database Service, suited perfectly to power business apps and dynamic web content.



Rapid.io is a cloud-hosted service that allows app developers to build realtime user interfaces without having to worry about the underlying infrastructure. It works as a non-relational data store accessible from client-side code.
Flexible DataSync is a BAAS with a complete client framework. Developers can build real-time applications and communication services and deploy them easily

Real Time Entity Framework (EF) and ASP.NET core. Make all of your data real time. Receive updates no matter where the object was created or edited. Uses existing ASP.NET core permissions system.

