We've been working on adding (alpha) PieFed support to the Interstellar app for the past few weeks, and it has finally been released.

Keep in mind that the API is currently limited in its capabilities, and we were not able to implement all the features Interstellar provides; this is the case wherever you see a screen or pop-up message that says "Unimplemented" error. Additionally, the alpha API could easily change at any moment, so don't expect it to work without issues.

If you'd like to try it out despite it being an "alpha" feature, then when you go to sign-in, enter preferred.social as the Instance Host. See this post (https://piefed.social/post/484755) if you'd like more information about that instance and general PieFed API info.