TvOS

tvOS (formerly Apple TV Software) is the operating system software derived from iOS and developed by Apple Inc. for its Apple TV and HomePod lines of home media devices.

Product history
tvOS has been based on a corresponding version of iOS since iOS 4.1, which was used for the second generation Apple TV. Version 13.4 merged in support for Apple's HomePod smart speaker. The current version of tvOS as of May 20, 2020 is 13.4.5.