Proton Mail vs DuoCircle Comparison (2025)

What are the differences between Proton Mail and DuoCircle?

Forward Email Team
Written by
Forward Email TeamVerified
Published
2/1/25
Time to read
Less than 5 minutes
We recommend Forward Email as the best alternative to Proton Mail.

Email Service Comparison

20 facts in comparison
Proton Mailvs.DuoCircle

Proton Mail

Secure email that protects your privacy
"Secure email that protects your privacy"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
vs.

DuoCircle

Protect Email Against Phishing, Spam and Malware
"Protect Email Against Phishing, Spam and Malware"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
$3.99/moPricingRequires you to talk to a sales team
15 GBStorageRequires 3rd party
25 MBAttachments50 MB
❌ Proton Mail claims to be open-source, but their back-end actually is closed sourceOpen-SourceNo
NoSandboxed Encryption No
NoUnlimited DomainsNo
NoUnlimited AliasesNo
NoTTI No
❌ Requires you to download Proton Mail Bridge and forces vendor lock-inSMTP❌ Requires 3rd party
❌ Requires you to download Proton Mail Bridge and forces vendor lock-inIMAP❌ Requires 3rd party
❌ Proton Mail does not support POP3POP3❌ Requires 3rd party
NoAPIYes
⚠️ Proton Mail rewrites your emailsE2EE No
YesOpenPGP No
YesWKD No

Email Service Screenshots

Closed-source

Proton Mail

Proton Mail is a closed-source email service. Its description from its website is: Secure email that protects your privacy

Proton Mail is a closed-source email service.
Photo by Forward Email
Go to site
Closed-source

DuoCircle

DuoCircle is a closed-source email service. Their website says: Protect Email Against Phishing, Spam and Malware

DuoCircle is a closed-source email service.
Screenshot by Forward Email
Go to site

Compare Proton Mail with 79 email services