Customer.io vs Apple Mail (iCloud) Comparison (2026)

What are the differences between Customer.io and Apple Mail (iCloud)?

Forward Email Team
Written by
Forward Email TeamVerified
Published
2/1/26
Time to read
Less than 5 minutes
We recommend Forward Email as the best alternative to Customer.io. We also support webmail: https://mail.forwardemail.net

Email Service Comparison

20 facts in comparison
Customer.iovs.Apple Mail (iCloud)

Customer.io

Send messages people actually want to receive using real-time customer data
"Send messages people actually want to receive using real-time customer data"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
vs.

Apple Mail (iCloud)

Private, secure, and personal email from Apple
"Private, secure, and personal email from Apple"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
$100/moPricing$0.99
No Customer.io does not support storageStorage50 GB pooled
2 MBAttachments20 MB
NoOpen-SourceNo
NoSandboxed Encryption No
NoUnlimited DomainsNo
NoUnlimited AliasesNo
NoTTI No
YesSMTPYes
NoIMAPYes
NoPOP3❌ iCloud does not support POP3
YesAPINo
NoE2EE No
NoOpenPGP No
NoWKD No

Email Service Screenshots

Closed-source

Customer.io

Customer.io is a closed-source email service. According to their website: Send messages people actually want to receive using real-time customer data

Customer.io is a closed-source email service.
Photograph by Forward Email
Visit Website
Closed-source

Apple Mail (iCloud)

Apple Mail (iCloud) is a closed-source email service. According to their website: Private, secure, and personal email from Apple

Apple Mail (iCloud) is a closed-source email service.
Photograph by Forward Email
Go to site

Compare Customer.io with 78 email services