Well, actually, PieFed.social has enabled it's API which means that the Android app Interstellar can be used with it. Find out more about the app at https://interstellar.jwr.one/.
Later today https://feddit.online/, another PF instance, will enable the API too and I expect others will follow in good time.
Also good to mention Interstellar also has a test flight for iOS and macOS as well. Meaning Interstellar will work on any platform (Android, iOS, Linux, macOS, Windows).
An update for Interstellar will be released tomorrow with additional PieFed API support, including PieFed notifications