Top 12 Open-Source Alternatives to ProtonMail

ProtonMail

Secure email with absolutely no compromises. Get your free encrypted email account today.

Product categories

Calendar Disposable Email Email Email Archiving Email Clients Email Management Email Productivity Email Security Email Service Provider Enterprise Communication SMTP Server Self-hosted Email

Summary

The top open-source alternatives to ProtonMail are Tutanota, Spark Mail, and Mailspring. One of the criteria for ordering this list is the number of mentions that products have on reliable external sources. You can suggest additional sources through the form here.

Tutanota Landing Page
1

Tutanota

Get your encrypted mailbox for free.
Pricing:
- Open Source
#Email #Email Clients #Enterprise Communication 177 social mentions
Spark Mail Landing Page
2

Spark Mail

Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues
Pricing:
- Open Source
#Email #Email Clients #Calendar 30 social mentions
Mailspring Landing Page
3

Mailspring

Mailspring is a mail client for Mac, Windows and Linux.
Pricing:
- Open Source
#Email #Email Clients #Calendar 25 social mentions
SimpleLogin Landing Page
4

SimpleLogin

Receive and send emails anonymously. Create a unique email address for each website to avoid cross-site tracking and protect your inbox from spam, phishing and data breaches.
Pricing:
- Open Source
- Freemium
- Free Trial
- $2.99 / Monthly (Premium)
#Security & Privacy #Fake Email #Email 271 social mentions
FairEmail Landing Page
5

FairEmail

Open source, privacy friendly email app
Pricing:
- Open Source
#Email #Email Clients #Calendar 52 social mentions
Mailpile Landing Page
6

Mailpile

Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features.
Pricing:
- Open Source
#Email #Email Clients #Email Management
Roundcube Landing Page
7

Roundcube

Web-based IMAP email client
Pricing:
- Open Source
#Email #SMTP Server #Email Clients 16 social mentions
Mail-in-a-box Landing Page
8

Mail-in-a-box

Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software and also includes contacts and calendar synchronization.
Pricing:
- Open Source
#Email #Self-hosted Email #Email Service Provider 115 social mentions
iRedMail Landing Page
9

iRedMail

A fully fledged, free email server solution, an open source project (GPL v2).
Pricing:
- Open Source
#Email #SMTP Server #Self-hosted Email 2 social mentions
Criptext Landing Page
10

Criptext

Criptext - Security that goes beyond encryption.
Pricing:
- Open Source
#Email #Email Clients #Email Service Provider 3 social mentions
mailcow Landing Page
11

mailcow

An open source mailserver suite.
Pricing:
- Open Source
#Email #Self-hosted Email #Email Service Provider 82 social mentions
Thexyz Landing Page
12

Thexyz

Secure premium email service with mobile sync apps for calendar, contacts, tasks, notes and FISMA compliant email archiving.
Pricing:
- Open Source
- Paid
- $2.95 / Monthly (25GB)
#Email #Email Security #Email Archiving 1 social mentions

Suggest an alternative

If you think we've missed something, please suggest an alternative to ProtonMail.

Please use the Feedback button if you think any of the listed products shouldn't be regarded as open-source.

ProtonMail discussion

Stan Bright
· 12 months ago
· Reply

I've been tempted to migrated out of Gmail to ProtonMail for a few times. I guess that'd happen one day. Unfortunately, the friction is too big to do it now.