Open Source ProtonMail Alternatives

    The best open source alternative to ProtonMail is Tutanota, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to ProtonMail and 17 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to ProtonMail are Disroot (Free, Open Source), Posteo (Paid, Open Source), CTemplar (Freemium, Open Source) and Criptext (Free, Open Source).

    The list of alternatives was last updated May 28, 2021

    Platforms

    • Online
    • iPhone
    • Android
    • iPad
    • Windows
    • Mac
    • Linux
    • Android Tablet
    • Software as a Service (SaaS)
    • Google Chrome
    • OpenPGP
    • Firefox
    • Self-Hosted
    • F-Droid
    • Gmail
    • SeaMonkey
    • Chromium
    • Thunderbird
    • DAVdroid
    • Apple Mail

    Features

    • Encrypted Email
    • Privacy focused
    • Support for IMAP
    • Privacy protection
    • End-to-End Encryption
    • Ad-free
    • Custom domain
    • POP3 Support
    • Web-Based
    • CardDAV
    • Calendar
    • Encryption
    • CalDAV
    • PGP Encryption
    • SMTP
    • Self destructing messages
    • Two factor authentication
    • Google Chrome Extensions
    • Anonymity
    • Integrated Spam Protection

    License

    × Clear
    • Free
    • Open Source
    • Paid
    All Filters

    Showing 10 of 17 alternatives