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Fastmail vs Posteo: catalog facts
Fastmail	Posteo
Paid Paid subscription with a 30-day free trial that needs no credit card.	Paid 1 euro per month, with paid upgrades for storage and aliases.
Android, iOS, Web	Web
Email, calendar and contacts in one service Choice of EU or USA data residency	Signup without personal details Low fixed monthly price
No free plan after the trial Hosted service, so your mail lives on Fastmail's servers	No free tier 4 GB base storage
Downloadable app, Web application, Hosted service	Web application, Hosted service
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 September 23, 2026

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