Haven't used it, but it looks like there are a few apps for iOS: https://mssun.github.io/passforios/

KeePass is a good solution, too. It also has iOS apps.

I use password safe which is a windows app but also has a database format so there are lots of cross platform apps that can act on the safe file. I sync it with Google drive and have a Linux and Android app that I use to access the safe.