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Zoho Calendar vs GRR: catalog facts
Zoho Calendar	GRR
Freemium Free to start, with paid Zoho plans for business features.	Free Free and open source under the GPL-2.0 licence.
Web	Web, Self-hosted
Team calendars with availability checks Built-in appointment and resource booking	Runs on ordinary PHP and MySQL hosting Built for booking shared rooms and equipment
Hosted service, with data stored by Zoho Most useful inside the wider Zoho ecosystem	Documentation and README mainly in French Only release builds are recommended for production
Web application	Self-hosted
Closed source	Open source
License not stated	License: GPL-2.0
Account needed	Not stated if an account is needed
Not stated if it 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.