Hey! I wrote up a list of Open Source iOS apps on the Privacy Guides community.
I’ve been slowly trying to become platform agnostic, so I can switch back and forth between OSs without losing function. I’m not 100% there, but I hope this list helps you too if you are looking to go that route.
Copying the relevant bits here.
For iOS:
Fully FOSS:
FOSS, but with a paid tier:
Paid Only, but Open Source:
For iOS:
Fully FOSS:
FOSS, but with a paid tier:
Paid Only, but Open Source:
Privacy Friendly, but not FOSS apps:
Edit: Added ente Photos, Mullvad, IVPN, Tutanota, Standard Notes, Notesnook, and Berty
Out of curiosity, if you’re on a Pixel, why not choose GrapheneOS?