Primal is decently well optimised for mobile but ofc still in development so couple features missing but they ain't sleeping so that's where I'd go personally.
Snort is also a good option, pure personal preference.
Discussion
Also if they’re only targeting Damus, Plebstr is excellent.
Here’s how each looks (Primal and Plebstr). 
Ah I wasn't aware that plebstr was on iOS too. Shame our iOS friends won't be able to post images from that (yet) tho 😞
There is also confesstr.com 👀👀
Yeah I didn't know Plebstr was on iOS until recently either. Think the Android version was first. But it's an amazing client with rapid development. Only downside is it's closed source.
Will have to check that one.
It's just a website that posts to the account nostr:npub18l6trwpkclnrae9v7wgjwrvxvrsm0t6kh228fwfg8zas08n49p7sjrlmtj
(Not a real solution lol, but a great lil idea for an account)
