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Teamup Calendar vs Proton Calendar: catalog facts
Teamup Calendar	Proton Calendar
Freemium A calendar can be created from the homepage; business features are sold as plans.	Freemium Free account available, with paid Proton plans and a business version.
Android, Web	Android, iOS, Web
Twelve views including timeline, scheduler and table Calendars can be shared across organizations	End-to-end encryption of event details Built-in scheduling for booking meetings
Hosted service with data on Teamup's servers Aimed mainly at business use	Requires a Proton account Works best within the Proton ecosystem
Downloadable app, Web application, Hosted service	Downloadable app, Web application, Hosted service
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account 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 September 23, 2026

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