Summit on F Droid

https://f-droid.org/packages/com.idunnololz.summit.fdroid

I also use Boost which looks nearly the same as Boost for Reddit used to look.

I have no idea what the Reddit app is like though, haven't been there for 5 years or so.

Another one is Interstellar

they also work with Piefed (interfraternity with Lemmy)