Proton Mail AlternativesOnly Open Source apps categorised as WebMail Providers

The best open source WebMail Provider 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 15 are open source WebMail Providers so hopefully you can find a suitable replacement. Other interesting open source WebMail Provider alternatives to Proton Mail are Disroot, Posteo, Infomaniak kMail and Onion Mail.

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Proton Mail alternatives are mainly WebMail Providers, but if you're looking for Email Clients or Calendar Apps 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. Onion Mail icon

    Onion Mail

     5 likes

    The power of simplicity. Onion Mail can manage emails in the normal network and in the Tor. Onion Mail protect your privacy and anonymity.

    31 Onion Mail alternatives

    Cost / License

    • Freemium
    • Open Source

    Application types

    Platforms

    • Online
    • Android
     
  8. Kolab Now icon

    Kolab Now

     43 likes

    Kolab Now provides a suite of intuitive apps in a user friendly environment to make your day to day online comms easier, smarter and most importantly; secure.

    Cost / License

    • Paid
    • Open Source

    Application types

    Platforms

    • Online
    • Software as a Service (SaaS)
    • DAVx5
    Kolab Now email
     
  10. 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
     
  11. Galae icon

    Galae

     1 like

    Galae is a secure email service focused on deliverability, self-management and interoperability. It totally relies on free/libre opensource software.

    Cost / License

    Application type

    Platforms

    • Online
    • Software as a Service (SaaS)
     
  12. Zero Email icon

    Zero Email

     5 likes

    Zero is an open-source AI email solution that gives users the power to self-host their own email app while also integrating external services like Gmail and other email providers. Our goal is to modernize and improve emails through AI agents to truly modernize emails.

    Cost / License

    • Free
    • Open Source (MIT)

    Application type

    Platforms

    • Online
    • Self-Hosted
    • Docker
    Zero Email screenshot 1
     
  13. 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
     
    |
    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
  14. I2P Mail icon

    I2P Mail

     1 like

    Anonymous peer-to-peer distributed communication layer built with open source tools and designed to run any traditional Internet service such as email, IRC or web hosting.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Online
    • I2P
    I2P Mail screenshot 1
     
  15. PEPS icon

    PEPS

     9 likes

    PEPS is an open source secure email and file sharing platform.

    Cost / License

    Application type

    Alerts

    • Discontinued

    Platforms

    • Linux
    PEPS screenshot 1
     
12 of 15 Proton Mail alternatives