iOS Ref

tvOS version by device

tvOS is an iOS-based operating system for Apple TV.

Apple TV with tvOS

Device Released First tvOS Max tvOS
Apple TV 4K 2017 11 12
Apple TV (gen 4) 2015 9

Other iOS-based Apple TVs

The second and third Apple TV ran a more stripped-down version of iOS known as “Apple TV Software”.

Device Released First Apple TV Software Max Apple TV Software
Apple TV (gen 3) 2012 5 (≈ iOS 5) 7 (≈ iOS 8)
Apple TV (gen 2) 2010 4 (≈ iOS 4) 6 (≈ iOS 7)

Other Apple TVs

The first Apple TV ran a modified version of Mac OS X 10.4 Tiger, also called “Apple TV Software”.

Device Released First Apple TV Software Max Apple TV Software
Apple TV (gen 1) 2007 1 (≈ OS X 10.4) 3 (≈ OS X 10.4)