CentrifugoDeliver realtime messages to application clients over WebSockets or server-sent events.
100% free open-source (Apache-2.0). Unlimited connections and message throughput.
Developer tools
Socket.IO
Free softwareOpen sourceLocal
Send live updates between your server and connected app clients using events and subscribed rooms.
What you can use it for
Send live updates between your server and connected app clients using events and subscribed rooms.
- Broadcast events to selected rooms and acknowledge messages.
- Reconnect clients and explicitly rejoin rooms after a disconnect.
Workflow coverage and comparison notes
Build self-hosted realtime app notifications and room-based pub/sub instead of buying additional managed messaging capacity. The named services also have free tiers. This comparison covers event delivery only, not SDK compatibility, managed global distribution, persistent history, SLA or Fanout GRIP reverse proxying.
Before you switch
Developer library, not a hosted messaging dashboard or drop-in SDK replacement. You must adapt client/server code and implement room authorization, monitoring, scaling and persistence. No managed global network, SLA or durable replay is included. Local checks did not test production load or multi-server operation.
Alternatives to these paid apps
Each comparison covers the workflow described above, rather than every paid feature.
More for the same workflow
See alternatives →Centrifugo