Been using Universalis for a couple months now. It’s basically a Catholic calendar app that gives you all the feast days, saint info, and liturgical readings. Pretty solid app if you’re into that kind of thing.
Here’s what you do: you can browse the calendar, read up on the saint of the day, and follow along with the Mass readings. There’s also a Liturgy of the Hours section which is pretty cool. And you can set reminders for different feast days – took me a while to figure that out but it’s useful.
Look, if you’re a practicing Catholic, you’ll probably like this. It’s not perfect – the design is a little dated and the ads can be annoying if you don’t pay – but overall it does the job. Worth checking out.