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OneCal vs Outlook Google Calendar Sync: catalog facts
OneCal	Outlook Google Calendar Sync
Freemium Free to start with no credit card required.	Free Free and open source under MPL-2.0, supported by donations.
Android, iOS, Web	Windows
Real-time sync across Google, Outlook and iCloud Control over which event details are copied	Syncs attendees, reminders and descriptions Portable version needs no installation
Requires granting a third-party service access to your calendars Hosted only, with no self-hosted option	Windows only and needs desktop Outlook Requires a Google account
Downloadable app, Hosted service	Downloadable app
Closed source	Open source
License not stated	License: MPL-2.0
Account needed	Account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.