Google Workspace Marketplace
Two-way calendar sync for Google Calendar™, Outlook, iCloud and CalDAV. Clients see Busy, you keep the details, and rules decide what each calendar shows.
Listing updated:November 3, 2026
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Overview
SYNCDATE keeps the calendars you hold at different companies honest about when you are busy, without any of them showing each other what you are doing.

Connect your Google™ account alongside Outlook, Microsoft 365, iCloud, Fastmail, Nextcloud, or any CalDAV server. Choose which calendars feed which. Book a meeting at one company and the time is blocked at the others.

New syncs copy events as Busy: no title, no guests, no location. A two-way Mirror between calendars you own keeps the real titles. You can change either choice before the sync starts. You can also write your own text for the title, description and location of every copy.

WHO USES IT

Consultants and contractors with a calendar at every client. Fractional executives and multi-company operators. Agency and studio owners. People whose week runs across three to eight accounts at different organisations.

HOW IT WORKS

1. Connect your accounts over OAuth.
2. Choose a direction: one way, or both ways.
3. Choose what crosses over: busy only, or the full details.
4. Google™ and Outlook changes usually reach the other calendar in under a minute. iCloud, Fastmail, Nextcloud, other CalDAV servers and subscribed feeds are checked about every 15 minutes.

WHAT IT DOES TO YOUR EVENTS

In a one-way sync, SYNCDATE only adds, updates and removes its own copies. In a two-way Mirror, edit either original and the copy follows. Every run is recorded. When you delete a sync, you can have SYNCDATE remove every copy it created.

CALENDARS SUPPORTED

Google Calendar™, Microsoft Outlook and Microsoft 365, iCloud, Fastmail, Nextcloud and other CalDAV servers, all two-way. Subscribed feed URLs (ICS) work as a read-only source.

WHY THESE PERMISSIONS

calendar.readonly reads the events SYNCDATE has to copy. calendar.events creates, updates and removes the copies SYNCDATE makes. SYNCDATE lists your calendars so you can choose them. It reads and writes events only in the calendars you select for a sync.

PLANS

Free: 2 accounts, 2 calendars, 1 sync. No card, no time limit.
Plus: 5 accounts, 20 calendars, 5 syncs, one year ahead, and if/otherwise rules for what each copy says.
Pro: 20 accounts, 100 calendars, 20 syncs, and a different rule for each calendar inside one sync. Busy to the client, full details to you.
Team: Pro on every seat, one company invoice, member management. Admins never see members' events.
Prices and trial terms: https://syncdate.app/pricing. Subscriptions are handled on syncdate.app.

SUPPORT

support@syncdate.app, or https://syncdate.app/support
For Google Workspace™ administrators: https://syncdate.app/support/workspace-admin

Google™, Google Calendar™ and Google Workspace™ are trademarks of Google LLC. SYNCDATE is an independent product and is not affiliated with, endorsed by, or sponsored by Google LLC.
Additional information
PricingFree of charge with paid features
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SYNCDATE will ask for the permissions shown below. Learn more
SYNCDATE will need access to your Google account
This will allow SYNCDATE to :
See and download any calendar you can access using your Google Calendar
View and edit events on all your calendars
See your primary Google Account email address
See your personal info, including any personal info you've made publicly available
Associate you with your personal info on Google
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