https://join-lemmy.org/apps this page lists various Lemmy interfaces. I've just joined the mlem testflight and it's decent. It also seems to be improving quite quickly now that people are flooding to Lemmy.
For Android there's Jerboa which seems to have the most features and Liftoff which is still getting there. Personally I like Thunder which supports iOS as well, I got it off GitHub
While Jerboa is an app created by the core developer of Lemmy, it's not as official app and the developer treat it as a personal project and freely blocks any instance he don't like there. I understand it's within his right to do so, but I still find it concerning due to his association with Lemmy and how many people think it's the official app.
