Mlem was just removed from TestFlight due to some issues one of the developers had recently. I think there might be another TestFlight version being sent out later by another of the devs.
That said, like others here I’ve also been testing Memmy, and in the interest of testing multiple I’ve also started testing Limbo as well (https://lemmy.world/u/limboapp). I’ve been really enjoying it as well.
I’ll be testing Artemis when it releases on TestFlight as it’s going to be the only Kbin app for a while.
Edit: to build on testing multiple, there was a post listing most (or maybe all currently?) apps in development - around 10 (https://sh.itjust.works/post/311799)
Apple limits beta users to 10,000, so nobody can do much about it. However, the team is getting ready to release 1.0 in July, after which that limit won’t be a thing anymore.
The Memmy developer seems to be releasing about one update a day with lots of bug squashes and quality of life updates. Mlem just pushed a new update and it had a good amount of updates as well. Seems like the developers may have different approaches (quick releases vs larger / slower releases).
Either way it’s exciting how much better both apps have gotten in such a short period of time.