Very promising!

Just installed today, 4* for now. Would be nice to be able to import ( and eventually export) to other popular reminder/calendar apps ( for instance, I use the Things app for recurring tasks). Find it extremely convenient to use only one app for both that seem to have ( so far) every feature I need and is easy to use! Good work!
One important feature that is missing is having recurrent tasks based on the completion date for example, a task that would repeat every 7 days...if Im 2 days late to complete it, the next recurrence would occur 7 days later, not 5 like the current implementation.

Tchoukie about Calendars 5 by Readdle, v5.9.0