One unified availability
Book a slot on any calendar and ZagCal blocks it on the rest — across every account and organization, in whichever direction you choose. No more cross-checking calendars or double-booking yourself.
Features
Everything it does — and everything it deliberately doesn't.
ZagCal keeps your real availability in sync everywhere without copying your calendars around. One honest view of when you're free; your event details stay where they belong.
Privacy by design
Only busy/free ever crosses between calendars. Titles, guests, notes, and locations stay put; mirrored events are a generic "Busy" block. Access tokens are encrypted at rest, and you can revoke any connection at any time.
Flexible sync modes
Keep the privacy-first default, or tailor a sync: give a connection a custom title (not just "Busy") and a color so you can tell which calendar a blocked slot came from. Need more? Switch on full-detail mode for a specific sync to copy real titles between two of your own calendars — off by default, with a confirmation before it ever turns on.
Built for multiple organizations
Keep a day job, a side gig, and personal life in one view without leaking between them. ZagCal enforces strict isolation between every organization you belong to — the sync engine refuses to mirror across ownership boundaries.
Shareable booking pages
Give people a personal link — zagcal.com/your-handle/your-page — to book real openings from your true availability, with buffers, blackout dates, and daily limits. Visitors see only open slots, never what's behind them.
Your data, your control
Export a copy of your account data or delete your account entirely — both self-serve, any time. On deletion ZagCal removes your data and tears down the busy placeholders it created; your real events are never touched.
Works with
Connect in minutes.
Link Google Calendar, Microsoft 365, and Apple iCloud with the minimum access needed for free/busy, then choose which calendars mirror to which. Google and Microsoft connect via OAuth; Apple uses an app-specific password over CalDAV — never your main Apple ID password.
Connect your calendars
Link your providers with read access to free/busy.
Choose what syncs
Pick which calendars mirror to which, and in which direction.
Stop double-booking
ZagCal keeps everything in sync from then on — quietly.
Get started
Never double-booked. Always in control.
Start free in a couple of minutes — no credit card. See pricing or read how we protect your data.
Private by default · No card required