Everest
Everest is aimed squarely at people running more than one calendar at once, a consultant juggling several clients' calendars plus their own, and automates the scheduling negotiation that normally happens over email. The free plan is a real trial at three booked meetings a month; anyone who schedules weekly will hit that within days and land on the $25 monthly plan, or $20 on annual billing.
Pros
- Works by CC on an email thread, so neither side needs a new app or account
- Syncs Google and Outlook calendars and only reads the threads it is copied on
- A permanent free plan with up to three calendars and three booked meetings a month
- One rescheduled thread counts as one meeting, so back-and-forth does not burn the quota
Cons
- Three booked meetings a month on the free plan is a trial, not a working allowance
- Only supports Google and Outlook, not other calendar providers
- The $20 headline price needs annual prepayment; monthly billing is $25