On KeePassXC’s website [1], they recommend MiniKeePass [2] and KeePass Touch[3]. I don’t own any iOS device, so I have tried neither.

[1] https://keepassxc.org/docs/#faq-platform-mobile

[2] https://itunes.apple.com/us/app/minikeepass/id451661808?mt=8

[3] https://itunes.apple.com/us/app/keepass-touch/id966759076?mt...