I made a mobile app for Fur Affinity for iPhone on my free time. I use it daily for a few months now to check latest submissions from artists I follow with the convenience of native mobile apps, with a feed similar to Twitter or Instagram.
The project is open source so you can check that...
I’ve been using ArtStudio for a few years now but it’s not the best. I’d love to use something similar to Manga Studio that smoothes the lines and has crisp, clean edges. Any apps you use that are good for that? I have a 6 Plus currently with iOS 12. Thanks!