1. The PWA ("Add to home screen" in Safari). It behaves like a native mobile app, but still runs silently in the browser. It's also automatically updated along with your instance. Most people use this option.
2. Kaiteki. A cross platform, native mobile client with first-class Calckey support that's been Android-only up until this point, but just a couple days ago we got the first iOS build working. The TestFlight link should be up in a week or two, I'd recommend checking in on the GitHub every few days (https://github.com/Kaiteki-Fedi/Kaiteki), and/or following the Fediverse account @Kaiteki@floss.social / the Telegram channel https://t.me/kaiteki_fedi
3. SocialHub (App Store, $4.99). It only has second-class support for Calckey (so no Calckey-specific features) but people seem to like it. I don't have an iOS device so I can't test it.
@maique@maique.lol@Kaiteki@floss.social here's a screenshot of the PWA and Kaiteki side by side. I can't show a SocialHub screenshot as I don't have an iOS device, but both the PWA and Kaiteki look the same on iOS as they do on Android.
@thatonecalculator Thank you. I did try the PWA but can’t, and I’ve tried, figure out how to increase the font size. Following the Kaiteki account, waiting for the link to the TestFlight to show up.