Proton Mail vs SimpleLogin Comparison (2025)

What are the differences between Proton Mail and SimpleLogin?

Written by

Forward Email Team

Published

4/1/25

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 Mail	vs.	SimpleLogin
Proton Mail "Secure email that protects your privacy" Website	vs.	SimpleLogin "Receive and send emails anonymously" Website
$3.99/mo	Pricing	$4/mo
15 GB	Storage	No SimpleLogin does not support storage
25 MB	Attachments	25 MB
❌ Proton Mail claims to be open-source, but their back-end actually is closed source	Open-Source	Yes
No	Sandboxed Encryption	No
No	Unlimited Domains	Yes
No	Unlimited Aliases	Yes
No	TTI	No
❌ Requires you to download Proton Mail Bridge and forces vendor lock-in	SMTP	No
❌ Requires you to download Proton Mail Bridge and forces vendor lock-in	IMAP	No
❌ Proton Mail does not support POP3	POP3	No
No	API	No
⚠️ Proton Mail rewrites your emails	E2EE	⚠️ Opt-in
Yes	OpenPGP	Yes
Yes	WKD	No

Email Service Screenshots

Closed-source

Proton Mail

Proton Mail is a closed-source email service. Their official description reads: Secure email that protects your privacy

Proton Mail is a closed-source email service.

Proton Mail is a closed-source email service.

Photo by Forward Email

Open-source

SimpleLogin

SimpleLogin is an open-source email service. Its description from its website is: Receive and send emails anonymously

SimpleLogin is an open-source email service.

SimpleLogin is an open-source email service.

Screenshot by Forward Email

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