Opinions on medications health iOS app?

Looking for actual experiences of helping older relatives with taking their
medications. Have you tried the in-built iOS medications app with them? Do
they find it helpful or annoying?

Are there other apps that are better? And why?

My relative has a good system for managing which tablets to take morning
and evening, but sometimes forgets or forgets whether they took them or
not.

Also does anyone know of an app or other system for managing when to top up
tablets that are running out? Here tablets are provided in different sized
packs (e.g. 16, 28, 30) which means they run out at different rates and is
difficult to keep up (for my relative). This isn't a pharmacy issue so no
comments on that required.

TIA