I've spent the last 3-4 years reviewing and testing apps.

Unfortunately, none of them do a good job with the calendar.

The event is recirculated and linked to the APPLE AND GOOGLE calendar.

Nobody gives more than these two calendars. They are insufficient.

One possibility is Planyway. It also depends on trello. That's a problem too.

Finally, no one does more than APPLE AND GOOGLE calendars.

Here I can say that google calendar is a bit ahead. Unfortunately Apple failed to develop time and note apps. Microsoft goes a little further. This is another matter.

Thanks to PCMag for the article.