Yes, as others have mentioned Mlem is an app for iOS which is currently under development. An early beta is on TestFlight and is currently open for everyone. Be aware that it is an early beta and is not feature-complete.
We're a small team but working hard towards getting the app to 1.0 by July 1 which provides a usable beta in the meantime. So, expect updates changes, etc. in the next few weeks.
You can follow along on lemmy in the Mlem Community and you can also join us in the Mlem Space on Matrix to chat with us!
We're also actively recruiting developers who wish to contribute. More info in this post.
Cheers!
-- The Mlem Team