Socket.IOSend live updates between your server and connected app clients using events and subscribed rooms.
Free MIT libraries · Self-hosted Node.js server · You pay any hosting and bandwidth costs
Developer tools
Vask
Free optionBrowser
Broadcast live updates to connected clients with Pusher-compatible WebSockets.
What you can use it for
Broadcast live updates to connected clients with Pusher-compatible WebSockets.
- Broadcast live updates to connected clients with Pusher-compatible WebSockets.
Workflow coverage and comparison notes
Fanout-heavy realtime updates with no more than 100 simultaneous clients. Pusher Sandbox caps 200,000 sent-plus-delivered messages/day; Startup is $49/month. Illustrative capacity, not measured usage: 5,000 broadcasts/day each delivered to 50 clients count as 255,000 Pusher messages/day and 150,000 Vask broadcasts in a 30-day month. Confirm burst/payload and actual subscription patterns before switching.
Before you switch
Check message size, burst and fair-use limits for your workload. No contractual uptime credits; API/protocol compatibility claims have not been independently tested. Free usage is shared across the account.
Alternatives to these paid apps
Each comparison covers the workflow described above, rather than every paid feature.
More for the same workflow
See alternatives →Socket.IO
CentrifugoDeliver realtime messages to application clients over WebSockets or server-sent events.
100% free open-source (Apache-2.0). Unlimited connections and message throughput.