Stream.io provides developers with tools for adding scalable feeds, activity streams, and chat functionality to their applications via the Stream APITrack this API. The company has recently announced a new SDK that aims to streamline the addition/creation of chat functionality for iOS applications.
With the release of the Stream iOS/Swift library the company also provided an in-depth tutorial to get users started creating fully functional chat applications on iOS. The tutorial covers everything from SDK setup to applying custom themes. Customizability is an important feature that the announcement highlights, acknowledging how varied the use-cases are for the functionality.
The Chat API is built with responsiveness in mind and Stream claims that response times are under 10ms.