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mailbox.org vs Fastmail: catalog facts
mailbox.org	Fastmail
Paid Subscription email and workspace service that can be tried before committing.	Paid Paid subscription with a 30-day free trial that needs no credit card.
Web	Android, iOS, Web
Email, storage, meetings and office tools in one account Data hosted in Germany under GDPR	Email, calendar and contacts in one service Choice of EU or USA data residency
A hosted service, not software you run yourself Requires a paid subscription after the trial	No free plan after the trial Hosted service, so your mail lives on Fastmail's servers
Hosted service	Downloadable app, Web application, Hosted service
Closed source	Closed source
License not stated	License not stated
Account needed	Account needed
Needs internet	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.