Hi,
Thanks for checking out PiFi and for your interest in the mobile app’s licensing and availability. I’ve published the firmware source on GitHub under the GPLv2 license, but the mobile app’s code isn’t open yet. I’m taking a phased approach—my plan is to open‑source it, but I don’t have a specific release date right now - have posted a bit about it in docs under current status - PiFi - Open Source & Current Status
I’ve also heard a few requests to make the app available on fDroid. It’s definitely on my radar, but for now it’s not listed there. Once I make more progress on documentation (and the app code is public), I’ll revisit fDroid distribution. I appreciate your questions, and please let me know if there’s anything else I can clarify and you can also reach me at paul@pifi.org if you prefer.