What Is Calendar Aggregation? How It Differs from Calendar Sync
· Norimitsu Shida · Kiruck Inc.
TL;DR
Aggregation reads free/busy across calendars without copying event details. Sync replicates events for a unified view. Aggregation is more private and real-time at query time; sync shows titles across tenants but duplicates data. Tenbin uses Google’s FreeBusy API across up to 10 accounts ($10/mo base) for booking.
Calendar aggregation defined
Query multiple calendars for busy intervals without accessing event titles, descriptions, or attendees for availability purposes.
Calendar sync defined
Copy event records between accounts/providers to mirror a combined view.
Key differences
Privacy: aggregation exposes only busy/free. Sync exposes duplicated event shells. Use cases: aggregation for scheduling; sync for unified viewing. Latency: aggregation at booking time; sync on intervals.
How aggregation works (technical)
OAuth to each Google account → parallel FreeBusy queries → merge busy ranges → offer only slots free across all targets. Tenbin then writes the booked event to the calendar you choose.
When sync wins
Multiple providers (Google + Outlook + iCloud) or when you need analytics on event text — aggregation is not a full read of other people’s meeting titles across tenants.
| Aspect | Aggregation | Sync |
|---|---|---|
| Data accessed | Free/busy | Full events (often) |
| Event copying | None | Yes |
| Privacy | Higher | Lower |
| Primary use | Scheduling | Unified view |
FAQ
Not of event titles — it determines availability. For a merged view of event text, sync tools are the usual path.
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