I (not OP) use pwsafe on macOS and iOS, a port of Password Safe [1] designed by Bruce Schneier.
It syncs the encrypted blob to iCloud, so I can pull up passwords on the iPhone if necessary. It is fairly simple, not much browser/OS integration - you just open the app, choose a safe/blob, enter the master password, and can then browse/edit your list of passwords, and in particular copy a password.
Simple, not too much functionality - not too much that can go wrong, I hope. (Often it has been the browser integration that lead to exploits in LastPass/1Pass, if I'm not mistaken)
It syncs the encrypted blob to iCloud, so I can pull up passwords on the iPhone if necessary. It is fairly simple, not much browser/OS integration - you just open the app, choose a safe/blob, enter the master password, and can then browse/edit your list of passwords, and in particular copy a password.
Simple, not too much functionality - not too much that can go wrong, I hope. (Often it has been the browser integration that lead to exploits in LastPass/1Pass, if I'm not mistaken)
[1] https://www.pwsafe.org/relatedprojects.shtml