Love this app
I have used this app for years, as I don’t like the calendar that Apple phones have. Not only is the app brilliant but the customer support is great too. Twice I’ve had to ask for help with something (once an app question, once something that was an iPhone setting so not even their “issue” as such) and both times they were quick to respond and solved the issue. I purchased the pro pack (I believe this was £2.99 but I may be wrong as it was a while ago), it’s well worth it as the features are handy.