There's several apps for the fediverse though? I always use Voyager for Lemmy (I don't really like the short-form Twitter style socials so I use Lemmy not Mastodon).

This is in the google play store too: https://github.com/aeharding/voyager Though I get it from F-Droid obviously.

I don't know about Apple, its ecosystem is way too closed for me. But Google offers fediverse apps.