One unified availability
Book a slot on any calendar and ZagCal blocks it on the rest as a generic "Busy" — automatically, so you're never double-booked.
Never double-booked. Never overshared.
ZagCal mirrors your calendars' free/busy across every account and organization, so a meeting on one shows as busy on all of them. We sync busy/free — never your event titles or details.
Works with Google Calendar, Microsoft 365, and Apple iCloud.
Why ZagCal
One real view of your availability — kept private.
Stop cross-checking calendars and stop leaking what's on them. ZagCal does one thing well: it keeps your free/busy in sync everywhere, without exposing a single event detail.
Privacy by design
Only busy/free ever crosses between calendars. Titles, attendees, and locations stay put. Tokens are encrypted at rest.
Built for multiple orgs
Keep work, a side gig, and personal life in sync without leaking between them — strict isolation between every organization you belong to.
Share a booking page
Let people book real openings on a personal link — with buffers, blackout dates, and daily limits, all from your true availability.
How it works
Connected in minutes.
Connect your calendars
Link Google, Microsoft 365, and Apple iCloud with read access to free/busy.
Choose what syncs
Pick which calendars mirror to which, and in which direction. You're in control.
Stop double-booking
ZagCal keeps everything in sync from then on — quietly, as a generic busy block.
Privacy
Your event details never leave your calendar.
Most sync tools copy your whole event across. ZagCal copies only the one thing that prevents a double-booking: that you're busy.
- We read and write busy/free only — never titles, guests, notes, or locations.
- Mirrored events are a generic "Busy" block, so nothing about the meeting is exposed.
- Access tokens are encrypted at rest; disconnect any time and the placeholders are removed.
- Strict data isolation between organizations — nothing bleeds across your accounts.
Pricing
Free to start. Upgrade when your team grows.
Personal use is free. Team plans add real-time push sync, unlimited syncs, and shared organization management.
See pricingNo credit card required to start.