SYNCDATE
SYNCDATE is a web application for two-way Google Calendar synchronization. Connect multiple Google accounts, select which calendars to sync, choose direction (one-way or two-way), and SYNCDATE keeps events aligned automatically in the background.
Key features:
- Multi-account sync — Connect multiple Google accounts and sync events between any of their calendars.
- Flexible sync rules — Choose one-way or two-way sync, configure title modes, privacy settings, description copying, and reminder handling per sync process.
- Privacy by default — Synced events default to "busy" visibility. Detailed copying is opt-in.
- Sync health monitoring — See sync status, freshness, latency, error summaries, and deterministic fix steps from the dashboard.
- Clean exit — Delete a sync process and optionally remove all events it created. Reversible and traceable.
- Webhook-driven with polling fallback — Events sync within seconds via push notifications, with 15-minute polling as a safety net.
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CalendarBridge
No More Missed Meetings. No More Double Bookings. CalendarBridge syncs all your calendars across all your Google and Microsoft accounts in real time and makes scheduling meetings simple. Universal Calendar Syncing All Your Calendars. Always in Sync. CalendarBridge syncs your calendars across Microsoft and Google accounts in real time so your complete schedule is always available from any device. Why is CalendarBridge Sync Awesome? Easy setup. 5-minute self-service setup. No configuration required on any of your devices. Regain Control of Your Devices. See your corporate calendars on your personal device without giving an IT admin the right to wipe your device. Simplified Calendar Sharing. Outlook and Google Calendar scheduling assistants now show your true free/busy times, including external calendars. Privacy Controls. With the option to sync only free/busy times, sensitive calendar information never crosses organizational boundaries.
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Keeper.sh
Keeper.sh is a calendar syncing tool that helps you stop double-bookings, and increases your organizational capabilities: compatible with Google Calendar, Outlook, Microsoft 365, Apple Calendar, Fastmail, CalDAV and more. It syncs events in realtime, allows you to redact information so you only sync what you want, and helps you connect your calendars to your agents through a convenient MCP server and optional API. If you'd like to share your calendar with the privacy and calendar filters of your choice, you can also generate as many ICS links as you want.
Keeper.sh has a convenient managed solution, but for privacy conscious users or technical hobbyists, it is open-source under AGPL-3.0, where you can get all premium features for free.
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CiraSync
Manual workarounds for syncing contacts, calendars, and notes to smartphones are error prone and time consuming. Custom apps are not scalable or have limited functionality. Without an automatic GAL sync solution, employees waste time looking up current contact information, are unable to identify critical business calls, or are forced to make manual updates. Unsynced shared calendars lead to missing business-critical meetings and ineffective management of projects, emergencies, or shifts. The CiraSync platform provides centralized administration with single sign-on, granular control, and best-in-class support. No software to install, no client configuration, and no need for user training. Sync unlimited number of contacts, shared calendars, and notes multiple times a day. Control who gets which contacts and calendars by leveraging existing distribution groups.
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