Pusher Channels
Real-time pub/sub messaging service for building live features like chat, notifications, and collaborative updates. Scales from prototype to production with a simple WebSocket API.
Use Cases
Free Tier
Sandbox free plan: 200,000 messages/day, 100 concurrent connections, standard support, Channels functions included, no monitoring integrations.
How to Maximize the Free Tier
Pusher's Sandbox plan is perfect for validating a real-time feature, but mind the 100 concurrent connection cap — that's roughly 100 active users at any moment, so it suits a dev environment or a small beta. With 200,000 messages/day you have headroom, but understand the fan-out model: publishing 1 message to 50 subscribers counts as 51 messages, so design your channels to minimize unnecessary broadcasts (e.g., only send presence updates on actual state changes). There's no SLA on the free tier, and Pusher will email you when you approach limits, so set up alerting early. For production scale, the Startup plan at $49/month jumps to 1M messages/day and 500 concurrent connections — consider if that cost is justified before you commit your architecture.
Getting Started
Sign up at pusher.com → Create a Channels app and copy your app credentials → Install the client SDK (JS, iOS, Android) from the docs → Connect to a channel and subscribe to events → Trigger events from your server and test the real-time flow.
Pros
- High daily message volume: 200,000 messages/day is generous for a free tier, enough for a busy demo or small community
- Simple pub/sub model: Straightforward API with client and server SDKs, making real-time features easy to build
- Channels functions included: Serverless functions for channel logic are available on the free plan, adding flexibility
Cons
- 100 concurrent connection cap: Severely limits active users; even a modest launch will exceed this, forcing a paid plan
- No SLA on free tier: No uptime guarantee, which is risky for any production-dependent feature
- Fan-out message counting: Messages multiply per subscriber, so a broadcast to 100 users costs 101 messages — budget carefully