Shameless plug (sorry) but I’m working on one too! It’s a web app that works on both desktop and mobile: https://slemmy.libdb.so.
It is a free-time kind of project (I work on it after my actual working hours), so it might not grow at the same pace as other newer apps, but I’m trying!
Source code is at https://libdb.so/slemmy, AGPLv3 license.
I made my own app at Slemmy!
Thanks to the CORS PR that I made to upstream Lemmy, all web clients should now be a lot easier to maintain, so I’m resuming work on mine as well!