Tiny Calendar Pro 4+

Tiny Calendar (called CalenMob before that) has been the only calendar app I have used on my mobile devices for at least ten years. It plays well with my Apple calendar and I use Google Calendar as the main database. Tiny Calendar converts the Google data and displays it in a neat, easy to read form. It converts all the Google calendars and settings flawlessly. If I lose my mobile device data for some reason, such as a phone update, it will retrieve the data quickly from Google and parse it cleanly. That way I always have my priceless calendar archive stored in two different places. One of my three most valuable productivity tools. Easily a five star app!
Update: I was reading some other reviews... Don’t let them discourage you. Several negative ones were due to minor changes that the user didn’t take time to tweak to their liking. This app has an incredibly detailed monthly view (formerly called mini-month), yet it’s clean as a whistle and very easy to read without switching to individual days or weeks!

My husband and I are 60+ years old. And we have tons of doctors appointments and special events to go to. This app is on both of our iPad and iPhones. We share one calendar, so no more I forgot, double booking, no lost appointment cards, most importantly we're both are on the same page. The Reminder feature is awesome, we will add a reminder of 2 hour 1 day 1 week to most of our appointments/events. We put the address in, so it just push a button and you got directions in your map app. When we enter an appointment we put the time, then, where we’re going, then who’s appointment it is. When we set the time in the app, it’s our travel time so if the appointment is at 2 o’clock in the afternoon and it takes two hours to get to your appointment, it would say.
2:00 PM Doctors - my name. The we set the time to start appointment 12:00, finish 5:00 PM😱

I’m an Apple/iCloud user but use Tiny because of it’s superior layout (so I can quickly see how many jobs per day I have, instead of only 1 “dot” per day). And I merge it with the iCloud calendar in order to sync with my employees which all works well.
But recently in my line of business I’ve added deposit requirements, which this one doesn’t support so I have to use a different scheduling app for quote and deposit capability.
But that app’s calendar layout is just like the iCloud calendar, only one dot per day no matter how many jobs per day are scheduled. So I book people through the scheduling app and merge it with tiny calendar which then merges to iCloud. At quick glance to see what all is scheduled, I primarily use tiny which is merged with now 2 other calendars to complete the full capability.
If only this one had a way to integrate deposits and share calendar with other users so I it could be an all in one.
Photo capability would be cool too.