Pusher Channels
Free Sandbox plan for realtime WebSocket channels: 200k messages a day, 100 concurrent connections.
Dev Tools
What you get
Hosted realtime WebSocket channels (pub/sub) with up to 200,000 messages a day and 100 concurrent connections.
How to get it
Sign up at pusher.com and choose the Sandbox plan.
The catch
100 concurrent connections is enough for a prototype; the next plan (Startup) is $49 a month for 500.
From the official page · checked Oct 28, 2026