watchOS Compatibility

From The Apple Wiki

As with every new watchOS update, it comes with a new compatibility version. With the bloated lists that can be found on the watchOS OTA Updates pages, the compatibility versions for the OTA pages have been moved to its own page.

watchOS Version Compatibility Version
1.0.1 4 & 5
2.0 to 2.1 5
2.2 6
2.2.1 to 2.2.2 6 & 7
3.0 to 3.1.1 7
3.1.3 7 & 8
3.2 to 3.2.2 8
3.2.3 8 & 9
4.0 to 4.2.2 9
4.2.3 9 & 10
4.3 to 4.3.2 10
5.0 to 5.1.3 11
5.2 to 5.3.5 12
5.3.6 to 5.3.9 12 & 14
6.0 to 6.2.5 13
6.2.6 to 6.3 14
7.0 to 7.3.3 15
7.4 to 7.6.2 16
8.0 to 8.4.2 17
8.5 to 8.8.1 18
9.0 to 9.3 19
9.4 to 9.6.3 20
10.0 to 10.3.1 21
10.4 22