Centrifugo

Centrifugo is a real-time messaging server designed for scalable and efficient communication. It provides WebSocket-based real-time notifications, chat applications, and live updates for web and mobile apps. The platform supports multi-channel messaging, message persistence, and integrates with back-end services through its API, enabling secure and fast message delivery.

Key Features

• Efficient real-time transports: WebSocket, HTTP-streaming, Server-Sent Events (SSE), GRPC, WebTransport
• Built-in scalability with Redis (or Redis Cluster, or Redis-compatible storage – ex. AWS Elasticache, KeyDB, DragonflyDB, etc), or Nats.
• Simple HTTP and GRPC server API to communicate with Centrifugo from the app backend
• Flexible connection authentication mechanisms: JWT and proxy-like
• Channel subscription multiplexing over a single connection
• Different types of subscriptions: client-side and server-side
• Various channel permission strategies, channel namespace concept
• Hot message history in channels, with automatic message recovery upon reconnect, cache recovery mode (deliver latest publication immediately upon subscription)
• Delta compression in channels based on Fossil algorithm
• Online channel presence information, with join/leave notifications
• A way to send RPC calls to the backend over the real-time connection
• Strict and effective client protocol wrapped by several official SDKs
• JSON and binary Protobuf message transfer, with optimized serialization
• Beautiful embedded admin web UI