To continue my ongoing praise here for using pass as an all-purpose password keeper and sync tool, I strongly do recommend Pass for iOS (GitHub), which is quite stable and has been my daily driver for the most part of the past year.
On Android the trusty old Password Store (Play, or preferably F-Droid) in combination with OpenKeychain is still the best way to go about. Kinda makes me wish there was a even remotely comparable PGP app for iOS.
If you’re not using a password manager yet, now is the best time to start. PGP/git being too complicated? No worries, I hear good things about bitwarden left and right, haven’t tried it myself, though.