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Tuta Desktop vs Runbox: catalog facts
Tuta Desktop	Runbox
Freemium A free account with limited storage and one address. Paid plans add custom domains…	Paid Paid subscription after a free 30-day trial.
Windows, macOS, Linux	Web
End-to-end encrypts mail bodies, subject lines, calendar and contacts Password-protected messages to recipients who are not Tuta users	Data hosted in Norway under Norwegian privacy law and GDPR No advertising
No IMAP or SMTP, so third-party mail clients cannot be used A Tuta account is required; it is not a general mail client	No free plan after the trial Hosted service, so you rely on the provider for your mail
Downloadable app	Web application, Hosted service
Open source	Closed source
License: GPL-3.0	License not stated
Account needed	Account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 24, 2026

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