Find a time that works
Connect the calendars you already use, say when you are willing to meet, and let people book a time without the four emails it usually takes. It works across companies, across accounts, and with people who have no account at all.
What it does not do
It never reads what your meetings are about. It asks your calendar when you are busy — start, end, and nothing else — and stores only that. Titles, attendees, locations and notes are never requested and never kept.