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Teamup Calendar vs GRR: catalog facts
Teamup Calendar	GRR
Freemium A calendar can be created from the homepage; business features are sold as plans.	Free Free and open source under the GPL-2.0 licence.
Android, Web	Web, Self-hosted
Twelve views including timeline, scheduler and table Calendars can be shared across organizations	Runs on ordinary PHP and MySQL hosting Built for booking shared rooms and equipment
Hosted service with data on Teamup's servers Aimed mainly at business use	Documentation and README mainly in French Only release builds are recommended for production
Downloadable app, Web application, Hosted service	Self-hosted
Closed source	Open source
License not stated	License: GPL-2.0
Not stated if an account is 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 1, 2026	Official website Full listing and sources Checked October 2, 2026

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