The android version of Katana looks and functions a bit better. I don't know if the devs are just less informed or just care less for iOS but, having made the switch recently, it's a pretty drastic difference.
Nonograms Katana also has a Web version: https://nonograms-katana.com/play/
I use it almost daily on my laptop.
On my phone, I use Nonogram Galaxy. So much that my previous phone has some of the app layout burned-in on the OLED screen.
https://m.youtube.com/watch?v=1PjruB8wDLQ
https://apps.apple.com/us/app/paint-it-back-gameclub/id14915...
Less pretty but very functional app with near infinite content to play these days is Nonograms Katana.
https://apps.apple.com/de/app/nonograms-katana/id1037710023?...