Ably Cocoa Client Library SDK API Reference
The realtime interface enables a client to maintain a persistent connection to Ably and publish, subscribe and be present on channels. The REST interface is stateless and typically implemented server-side. It is used to make requests such as retrieving statistics, token authentication and publishing to a channel.
View the Ably docs for conceptual information on using Ably, and for API references featuring all languages. The combined API references are organized by features and split between the realtime and REST interfaces.