Pretty good
I have an iPhone 6 on iOS 10 and I havent had any crashing, which seems to be the biggest complaint, so anything of the same or newer should be fine.
So that aside, the app itself is really good especially considering its free.
Ive noticed a few times that a few lyrics are wrong (nothing big though, an example being in a song it says "shine" instead of "shrine") and its a tad annoying, but only one word messed up per song in two songs of the 18 I listened to.
Graphics are good, and I like the widget. So overall Id recommend it.
Rupee1 about
Musixmatch Lyrics Finder, v6.5.1