Every Frame Perfect ⇥ tonsky.me

Nikita Prokopov:

The rule of thumb is:

If I take a screenshot of your app at any moment, you should be able to explain what I see.

Why care about every frame? It builds trust. Users can’t see the code, so UI is the only way for them to judge the quality of the app. If UI looks good, that means developers had time to polish it, which means that they probably spent a comparable amount of time to iron out the code. It’s a heuristic, but a reasonable one.

Prokopov lists several criteria, but this post is almost wholly dedicate to the last one: “precise animations”. More specifically, in the case of this article, a lack thereof, particularly throughout MacOS and its first-party apps. I loved this post, and Prokopov did not even mention one of the most glaring in MacOS Tahoe: the four-finger trackpad gesture, the one that used to show Launchpad, now displays the App Drawer before the animation plays, then plays the animation, then shows the App Drawer again. If animations like these ship, it certainly raises questions about what else was deemed unworthy of being fixed.