All IOS Lemmy clients listed:
Mlem:
Memmy:
Liftoff:
Thunder for Lemmy:
Olympus:
Lemmotif:
Avelon:
Voyager (wefwef) [Web-App]:
Lemur:
Lemmios:
Bean:
Lunar:
Lemmynade:
Cavy:
Remmel (not updated, dead?):
(Other) Lemur (Upcoming):
Ares (Upcoming):
Beyond (Upcoming):
Morpha (Upcoming):
I also like to use android apps on iOS.