Ably

API

Realtime pub/sub messaging, chat and state sync over a global edge network

Price: Free tier, then paid
Access: API key

About

Hosted realtime platform: clients subscribe to channels over WebSockets and servers publish through REST or realtime SDKs, with presence, message history and push notifications. Chat, LiveObjects and LiveSync build on it. The free package includes 6M messages a month.

What you can do with it

Push live updates to browsers and phones over pub/sub channels
Add chat rooms with typing indicators, reactions and presence
Sync shared state or database changes to clients in realtime

Get started

Create an app in the Ably dashboard and copy its API key
Publish to a channel over REST, or subscribe with a realtime SDK
Use JWT or token auth for browser and mobile clients

Example

curl -X POST "https://main.realtime.ably.net/channels/rest-example/messages" \
  -u "$ABLY_API_KEY" \
  -H "Content-Type: application/json" \
  --data '{ "name": "publish", "data": "example" }'

Details

Hosting: Hosted service
Available in: Worldwide
Official SDKs: JavaScript/TypeScript, Python, Go, Java, Kotlin, Swift, Ruby, PHP, C#, Dart
MCP server: None