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