Open Source Proton Mail Alternatives Filtered by 'Encrypted Email'

The best open source alternative to Proton Mail is Tuta Mail. If that doesn't suit you, our users have ranked more than 50 alternatives to Proton Mail and nine of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Proton Mail are Disroot, Posteo, Infomaniak kMail and FlowCrypt.

filter to find the best alternatives

Proton Mail alternatives are mainly WebMail Providers, but if you're looking for Email Clients or File Encryption Software you can filter on that. Other popular filters include Free, Self-Hosted and Open Source. These are just examples - use the filter bar below to find more specific alternatives to Proton Mail.
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Alternatives list

  1. Tuta Mail icon

    Tuta Mail

     531 likes

    Offers comprehensive encryption for email, calendar, and contacts with zero personal info required. Built on open source, install via Play Store, F-Droid, or APK, with Tor and VPN support. Both free and paid plans; utilizes quantum-resistant encryption ensuring privacy-focused, anonymous usage.

    103 Tuta Mail alternatives

    Cost / License

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • iPad
    • Flathub
    • F-Droid
    Tuta Mail screenshot 1
     
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    10
    Tuta Mail vs Proton Mail Comments
    Top Positive Comment
    Advik
    3

    Tutanota is end-to-end encrypted, as well offers 1 GB mail storage on free plan. The pro plans are cheap compared to protonmail, so it's better for low budget users

    Conner Vieira
    Positive
    -2

    Tutanota has historically been a lot more transparent, and arguably has been more honest about issues and plans

    Ada Byron
    Positive
    1

    I use both, ProtonMail is more secure but also more expensive and not as user-friendly. You cannot beat the price of Tutanota for service they provide.

    3 of 10 comments
    • Tuta Mail is Freemium and Open SourceProton Mail is also Freemium and Open Source
    • Tuta Mail is LightweightProton Mail is not according to our users
  2. Disroot icon

    Disroot

     120 likes

    Disroot is a platform providing online services based on principles of freedom, privacy, federation and decentralization.

    44 Disroot alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Online
    • F-Droid
    Disroot screenshot 1
     
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    3
    Disroot vs Proton Mail Comments
    Leonardo Eugenio
    Positive
    2

    imap smtp support, open source, all free

    Guest
    Positive
    0

    Simple, efficient, you can use it with Tunderbird or other mail client.

    Review by a new / low-activity user.
    Kris22332
    Positive
    -3

    Proton is not confidential at all, because it is under the influence of the EU. The best thing you can find for anonymous messaging and file sharing is the Utopia ecosystem (U.IS)

    • Disroot is Free and Open SourceProton Mail is Freemium and Open Source
  4. Posteo icon

    Posteo

     85 likes

    Web- and IMAP-based email service. 4GB cost 1€/month. Information is hosted on encrypted hard drives. Electricity from renewable resources is used.

    73 Posteo alternatives

    Cost / License

    • Paid
    • Open Source

    Application types

    Platforms

    • Online
    Drag and drop
     
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    1
    Posteo vs Proton Mail Comments
    John Fastman
    Positive
    2

    Posteo could be a good Protonmail alternative. It offers email encryption in a similar way: Posteo's people, government surveillance and successful hackers won't get into your email content. It also offers a calendar feature, which protonmail users have been crying out for for years.

    • Posteo is Paid and Open SourceProton Mail is Freemium and Open Source
    • Posteo is Security-focusedProton Mail is not according to our users
  5. Ad
  6. Infomaniak kMail icon

    Infomaniak kMail

     43 likes

    Privacy-focused Swiss email system provides 20 GB free storage, supports custom domains and unlimited storage, syncs contacts and calendars, is ad-free, and is part of a secure productivity suite used by over a million users across Europe on all devices.

    44 Infomaniak kMail alternatives

    Cost / License

    Application types

    Platforms

    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • F-Droid
    Infomaniak kMail screenshot 1
     
  7. FlowCrypt icon

    FlowCrypt

     17 likes

    FlowCrypt (formerly CryptUp) is the easiest PGP encryption for Gmail. It behaves just like standard email, except it's encrypted.

    Cost / License

    • Freemium
    • Open Source

    Platforms

    • Android
    • iPhone
    • Google Chrome
    • Brave
    • Firefox
    • OpenPGP
    FlowCrypt screenshot 1
     
  8. Swisscows.email icon

    Swisscows.email

     5 likes

    Swisscows.email is another product of Swisscows AG. This product offers you secure email traffic. With Swisscows.email you can send your emails encrypted so that absolutely no one can read them. The service is comparable to a letter that is protected from prying eyes in an...

    Cost / License

    • Paid
    • Open Source

    Application types

    Platforms

    • Online
    • iPhone
    • iPad
    • Android
    • Android Tablet
    Swisscows.email screenshot 1
     
  10. GPGMail icon

    GPGMail

     11 likes

    GPGMail is a PGP plugin for Apple Mail. It brings the functionality to sign, verify, encrypt and decrypt mails using the OpenPGP standard.

    Cost / License

    • Paid
    • Open Source

    Platforms

    • Mac
    • GPGTools
    • Apple Mail
     
  11. Forward Email icon

    Forward Email

     6 likes

    Forward Email is the best email service, encrypted email service, and fastest email service. It supports unlimited domains and aliases for no extra cost. It uses quantum safe ChaCha20-Poly1305 encryption and offers SMTP, IMAP, POP3, email webhooks, email regular expressions...

    35 Forward Email alternatives

    Cost / License

    Application type

    Platforms

    • Self-Hosted
    • Online
    Forward Email screenshot 1
     
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    1
    Forward Email vs Proton Mail Comments
    linuxplayer
    Negative
    1

    Needs an existing email to be used for free. You have to pay to create an email.

    • Forward Email is Freemium and Open SourceProton Mail is also Freemium and Open Source
  12. WebPG icon

    WebPG

     2 likes

    WebPG is a free, open source suite of tools to bring OpenPGP (GnuPG/PGP, gpg, gnupg) to the browser, in an effort to make cryptographic methods usable, safe and accessible to the common man.

    Cost / License

    • Free
    • Open Source

    Application type

    Alerts

    • Discontinued

    Platforms

    • Mac
    • Windows
    • Linux
    • Google Chrome
    • Thunderbird
    • SeaMonkey
    • Chromium
    • Firefox
    • OpenPGP
    WebPG screenshot 1
     
9 of 9 Proton Mail alternatives