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Proton Calendar vs Teamup Calendar: catalog facts
Proton Calendar	Teamup Calendar
Freemium Free account available, with paid Proton plans and a business version.	Freemium A calendar can be created from the homepage; business features are sold as plans.
Android, iOS, Web	Android, Web
End-to-end encryption of event details Built-in scheduling for booking meetings	Twelve views including timeline, scheduler and table Calendars can be shared across organizations
Requires a Proton account Works best within the Proton ecosystem	Hosted service with data on Teamup's servers Aimed mainly at business use
Downloadable app, Web application, Hosted service	Downloadable app, Web application, Hosted service
Closed source	Closed source
License not stated	License not stated
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 September 23, 2026	Official website Full listing and sources Checked October 1, 2026

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