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Proton Calendar vs Zoho Calendar: catalog facts
Proton Calendar	Zoho Calendar
Freemium Free account available, with paid Proton plans and a business version.	Freemium Free to start, with paid Zoho plans for business features.
Android, iOS, Web	Web
End-to-end encryption of event details Built-in scheduling for booking meetings	Team calendars with availability checks Built-in appointment and resource booking
Requires a Proton account Works best within the Proton ecosystem	Hosted service, with data stored by Zoho Most useful inside the wider Zoho ecosystem
Downloadable app, Web application, Hosted service	Web application
Closed source	Closed source
License not stated	License not stated
Account needed	Account 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 2, 2026

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