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CalSync vs OneCal: catalog facts
CalSync	OneCal
Free Free and open source under the GPL-3.0 licence, with no subscription.	Freemium Free to start with no credit card required.
Android	Android, iOS, Web
Works entirely on the device Custom names for copied events	Real-time sync across Google, Outlook and iCloud Control over which event details are copied
Android only Only syncs calendars already present on the device	Requires granting a third-party service access to your calendars Hosted only, with no self-hosted option
Downloadable app	Downloadable app, Hosted service
Open source	Closed source
License: GPL-3.0	License not stated
No account needed	Account needed
Works offline	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.