CalendarTunnel
Several calendars, one availability.
A Geometric Fever product. Connect the calendars you already use and it keeps them saying the same thing, with nothing to copy from one to the other.

What it does
One booking in one calendar closes the hour in all of them.
You connect the calendars once and they start knowing about each other. Book something in one and the hour stops being free in the others; cancel it and the hour comes back. There is no manual step and no file to import.
Of what the event says, nothing is stored. What crosses over is that you are busy, and no more than that: no title, no notes, no guests, no meeting link. It runs on servers in the European Union.
Google, iCloud, Outlook and Zoho
All four at once, plus any calendar that publishes an ICS feed.
You sign in through the calendar itself
The connection is made over OAuth, the ordinary Google or Microsoft authorisation. No password is stored and you can cut the connection whenever you want.
Rules per calendar
You decide what each calendar shows the others, so the personal one never has to enter the work one.
Nothing gets duplicated
Every synced event is tracked one by one, so duplicates are caught and removed.
Repeating series, and the exceptions
A weekly booking crosses over whole, and the week you changed crosses over as you changed it.
Tentative stays tentative
An event that is not confirmed yet crosses over flagged as such, instead of closing the hour for good.
Who it is for
For anyone living in more than one calendar.
- You have the company calendar and you have your own, and the two diaries cannot see each other.
- You work for more than one client, each with a calendar of their own.
- You have booked two things for the same hour and only noticed the day before.
- You lose time copying bookings from one calendar to another just to block the hour.
The product
CalendarTunnel has a site of its own.
Connecting the calendars, the privacy rules and the plans are there. What it does and who it is for is here.
