Pusher is a simple hosted API for quickly, easily and securely adding realtime bi-directional functionality via WebSockets to web and mobile apps, or any other Internet connected device.
Our event based abstraction makes it simple to bind UI interactions to events that are triggered from any client or server.
As well as a WebSockets API, we have a REST API for publishing your messages. This is ideally suited to web server technologies and we have a set of REST API libraries in many common languages to help you to do this.
We have a simple Publish/Subscribe model based on channels that allows you to filter and control how people receive your messages.
We supply functionality such as authentication mechanisms for private channels, and presence functionality for keeping track of who's online.
Pusher has released Beams, a push notifications API for mobile app developers. Pusher Beams allows developers to manage device tokens for iOS and Android apps. Developers can also use Beams to trigger notifications based on the in-app activity of users so that users remain engaged with their apps.
Pusher has partnered with a number of key API providers to release a free subscription package for developers. The Pusher Developer Package offers 13 free services which includes data storage, authentication, data measurement, hosting, email, real-time communications, and search.