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Tuta Desktop vs Posteo: catalog facts
Tuta Desktop	Posteo
Freemium A free account with limited storage and one address. Paid plans add custom domains…	Paid 1 euro per month, with paid upgrades for storage and aliases.
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	Signup without personal details Low fixed monthly price
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 tier 4 GB base storage
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 23, 2026

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