App is now spot on, but were glitches - possibly user error.
I am very pleased (Five Stars) with this app, when I haven’t my rosary with me I can pray the day’s mysteries easily with only occasionally losing my place. A great help in my prayer life, and one of my most reliable prayer apps. Initially I dropped it to 3 stars because after months of use it stuck on the sorrowful mysteries no matter the day! It resolved with reinstallation which likely turned the cellular data control on. Possibly it didn’t link to the iPhone calendar after a few iOS updates but now it I left the cellular data on. Most apps I keep the data off to save battery life.