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Runbox vs Mailo: catalog facts
Runbox	Mailo
Paid Paid subscription after a free 30-day trial.	Freemium Free sign-up, with a paid Pro offer for businesses and organisations.
Web	Android, Web
Data hosted in Norway under Norwegian privacy law and GDPR No advertising	Data stored on servers in France and not used or sold Choice of address domain
No free plan after the trial Hosted service, so you rely on the provider for your mail	Mainly aimed at French-speaking users No end-to-end encryption mentioned
Web application, Hosted service	Downloadable app, 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 24, 2026	Official website Full listing and sources Checked October 2, 2026

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