Excellent
Excellent app if you need to know the holidays for different countries. Useful for business and travels. I use it since 2013 without problems. It is necessary give it access to your calendars (app) because it work with the calendar app from apple (with its data base) but this have a lot of benefits to be compatible with others apps (i use also CalAlarm2 instead apple app). Using the same database that apple calendar app you can use icloud to sync to other devices. I sync with 7 different models without any problem for years.