Is there any way to tell apart macOS versions by quick or close inspection of the login screen or lock screen?
Knowing this would speed up macOS identification if (for example, only High Sierra shows the day of the week top right or the change user icon is rendered differently)
Are there any major / minor builds of macOS that have telltale clues as to what OS is running looking at the lock screens of macOS?
Best Answer
Until 10.10, there was a textured background for the login screen. 10.10-10.11 was flat grey I believe, then 10.12 on showed a blurred background image.