Privacy: Encrypted Email
Audited?
Available on Linux?
Available on Mac?
Available on Windows?
Available on Android?
Available in F-Droid?
Available on iOS?
Free plan available?
PGP support?
Backup/Export available?
Additional notes
ProtonMail
Yes
Web or Paid Bridge Only
Web or Paid Bridge Only
Web or Paid Bridge Only
Yes
Yes
Yes
Yes
Yes
Yes
Includes VPN service, Calendar, and Drive storage with all plans
Skiff
Results not released
Web only
Yes
Web only
Yes
No
Yes
Yes
No
Import only
Includes collaborative workspace, calendar, and Drive storage with all plans
Tuta
Web client only
Yes
Yes
Web only
Yes
Yes
Yes
Yes
No
Individual export only
Includes Calendar with all plans