I use Outlook and Google Calendar.

I love Fantastical! Use it... vote +1

I use actually a calendar called fantastical

I’m similar to Mr. Hoggan, but my work uses Google Calendar.

Great question, Josh. I use two. I use Apple Calendar and Outlook on iOS. I’m not required to keep them separate, but it helps me overall to do so. For me, this is a wish list item, but it’d be awesome to connected it to both. Haha. That said, work uses Outlook, life uses Apple Calendar. Initially, I got wave for work, but I’m already considering using it for personal things too. (Had some doctor appointments recently that reminded me how you really cannot remember it all!)

To those interested in this, do you use your device's native calendar app (eg. Apple Calendar) or more 3rd party like Google or Microsoft?