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Source code lives here: https://github.com/MiniKeePass/MiniKeePass

The biggest problem with MiniKeePass, in my opinion, is that it doesn't support the new iOS autofill API and that it doesn't support even basic syncing. You always have to make a manual copy of the database file and you can't really create logins on mobile because of that.

There's a fork of MiniKeePass called KeePass Touch, but they don't publically host the source code anywhere. You have to email them to ask for a copy of the source code, which is technically GPL-compliant, but a bit annoying.

On Android: keepassx2android offline app is pretty good.

I am using Keepass Touch in iOS