Heimdal vs HEY Comparison (2025)

What are the differences between Heimdal and HEY?

Forward Email Team
Written by
Forward Email TeamVerified
Published
7/1/25
Time to read
Less than 5 minutes
We recommend Forward Email as the best alternative to Heimdal.

Email Service Comparison

20 facts in comparison
Heimdalvs.HEY

Heimdal

One Platform. Total Security.
"One Platform. Total Security."
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
vs.

HEY

We finally fixed your email + calendar!
"We finally fixed your email + calendar!"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
Requires you to talk to a sales teamPricing$99/yr + $12/mo per user
Requires 3rd partyStorage100 GB
UnknownAttachmentsHEY does not use regular email attachments, which also prevents them from being encrypted with PGP
NoOpen-SourceNo
NoSandboxed Encryption No
NoUnlimited DomainsNo
NoUnlimited AliasesNo
NoTTI No
❌ Requires 3rd partySMTPNo
❌ Requires 3rd partyIMAPNo
❌ Requires 3rd partyPOP3No
YesAPINo
NoE2EE No
NoOpenPGP No
NoWKD No

Email Service Screenshots

Closed-source

Heimdal

Heimdal is a closed-source email service. Their website says: One Platform. Total Security.

Heimdal is a closed-source email service.
Screenshot by Forward Email
Visit Website
Closed-source

HEY

HEY is a closed-source email service. According to their website: We finally fixed your email + calendar!

HEY is a closed-source email service.
Photograph by Forward Email
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Compare Heimdal with 78 email services