Fastmail vs Proton Mail Comparison

Feature	Fastmail Visit →	Proton Mail Visit →
Overview
Rating	6.8	8.5
Pricing	$5.00/moIndividual (monthly) $5.00/moIndividual (annual) $8.00/moDuo (annual) $11.00/moFamily, up to 6 (annual) Show billing detailsHide billing details Individual (monthly): US$5/mo Individual (annual): US$60 for 12 months Duo (annual): US$96 for 12 months Family, up to 6 (annual): US$132 for 12 months	$4.99/moMail Plus (individual, annual) $12.99/moProton Unlimited (individual, annual) Show billing detailsHide billing details Mail Plus (individual, annual): $59.88/year at renewal ($47.88 first year with the introductory rate) Proton Unlimited (individual, annual): $155.88/year at renewal ($119.88 first year with the introductory rate)
Free tier	Paid only	Limited free tier Show detailsHide details 1 GB storage, 1 email address, 150 messages/day, 10 hide-my-email aliases, no custom domain
Established	1999	2014
Platforms	WindowsmacOSLinuxAndroidiOS	WindowsmacOSLinuxAndroidiOS
Privacy
Jurisdiction	Australia Show detailsHide details Fastmail Pty Ltd, PO Box 234, Collins St West, VIC 8007, Australia, ABN 31 142 646 580, headquartered in Melbourne. Also operates Fastmail US LLC, a satellite office at 1429 Walnut Street, 12th Floor, Philadelphia, PA 19102, USA. Independent and employee-owned — not venture-backed or acquired by a larger group.	Switzerland Show detailsHide details Proton AG, Route de la Galaise 32, 1228 Plan-les-Ouates, Geneva. Since June 2024 the primary shareholder is the non-profit Proton Foundation, also based in Geneva. Proton Europe sàrl (Luxembourg) is the designated EU GDPR representative.
Independent security audit	None on record	Securitum 2021 Show audit detailsHide audit details Source-code security audit of the redesigned Proton Mail web client and Proton Calendar, prior to release
Source code	Partly open source	Fully open source
Zero-access encryption	No	Yes
Intra-provider E2EE	No	Yes
External PGP	Manual import	Manual import
Past data breach	No	No
Telemetry	On unless you opt out	On unless you opt out
Features
Hosting	Cloud	Cloud
Custom domain support	Yes	Yes
Aliases	Unlimited	Unlimited
Anti-spam approach	Connection-level blocking of known spam-sending infrastructure before a message is accepted, followed by content-based scoring of accepted mail with a threshold that routes high-scoring messages to Spam; the filter adapts per user from Report spam / Not spam / delete / archive actions. Documented on the vendor's own Stop Spam help page as analysing message content server-side, consistent with a provider that holds the encryption keys and makes no zero-access claim.	PhishGuard flags spoofing and phishing using sender authentication (SPF/DKIM/DMARC) and metadata such as headers, link URLs and attachment hashes, not message content, since encryption prevents Proton from reading it; a machine-learning model retrains on user feedback (marking spam/phishing or rescuing a message from spam).
Bundled services	CalendarContactsFiles	CalendarDriveVPNPass