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Outlook Google Calendar Sync vs Keeper.sh: catalog facts
Outlook Google Calendar Sync	Keeper.sh
Free Free and open source under MPL-2.0, supported by donations.	Freemium Hosted Pro costs $5; self-hosting is free and includes every Pro feature.
Windows	Web, Self-hosted
Syncs attendees, reminders and descriptions Portable version needs no installation	Works with Google, Outlook, iCloud, Fastmail and CalDAV as source or destination Privacy controls hide event details in the copies
Windows only and needs desktop Outlook Requires a Google account	iCal and ICS links can only be pulled, not written to Self-hosting requires registering your own Google and Microsoft sign-in apps
Downloadable app	Web application, Self-hosted, Hosted service
Open source	Open source
License: MPL-2.0	License: AGPL-3.0
Account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
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.