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Harmonizely is a free scheduling tool which provides a reliable, very simple to use and fast solution to schedule meetings with your customers.
It integrates with your online calendar: Google, iCloud, FastMail, Nextcloud or any CalDAV compatible calendar.
Harmonizely is the only scheduling tool I could find that supported CalDAV. Their support is simply amazing, and any issues or feature requests I had have been dealt with faster than I ever would have expected. You have to try it out if you're using another app!