Open Source Zoho Mail AlternativesWebMail Providers & Email Clients like Zoho Mail

The best open source alternative to Zoho Mail is Proton Mail. If that doesn't suit you, our users have ranked more than 100 alternatives to Zoho Mail and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Zoho Mail are Tuta Mail, Disroot, FairEmail and Posteo.

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Alternatives list

  1. Proton Mail icon

    Proton Mail

     1017 likes
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    Proton Mail provides secure email services with end-to-end encryption, ensuring data protection. Swiss-based and outside US jurisdiction, it offers a free version to champion privacy as a human right. Fully accessible on any device.

    98 Proton Mail alternatives

    Cost / License

    • Freemium (Subscription)
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • iPad
    • Tor
    • Flathub
    • Snapcraft
    Proton Mail screenshot 1
     
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    12
    Comments about Proton Mail as an Alternative to Zoho Mail
    Guest
    Negative
    11

    Free plan does not allow your own domain

    Review by a new / low-activity user.
    Serely Lalla
    Positive
    -1

    Encryption and secure service.

    Zoho Mail Icon
    Proton Mail icon

    • Most users think Proton Mail is a great Zoho Mail alternative.

    • Proton Mail is the most popular Web-based, Windows, Android & Mac alternative to Zoho Mail.

    • Proton Mail is the most popular Open Source & free alternative to Zoho Mail.

    • Proton Mail is Freemium and Open SourceZoho Mail is Freemium and Proprietary
  2. Tuta Mail icon

    Tuta Mail

     516 likes
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    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

    • Freemium (Subscription)
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • iPad
    • Flathub
    • F-Droid
    Tuta Mail screenshot 1
     
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    2
    6
    Comments about Tuta Mail as an Alternative to Zoho Mail
    Guest
    Negative
    3

    Free plan does not allow your own domain

    Review by a new / low-activity user.
    Guest
    Positive
    -1

    Its open source, so its bugs will always be minimal.

    Review by a new / low-activity user.
    Zoho Mail Icon
    Tuta Mail icon

    • Most users think Tuta Mail is a great Zoho Mail alternative.

    • Tuta Mail is Freemium and Open SourceZoho Mail is Freemium and Proprietary
    • Tuta Mail is LightweightZoho Mail is not according to our users
  4. Disroot icon

    Disroot

     113 likes
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    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
     
  5. Ad
    Screenshot
    Infomaniak kMail icon
    Infomaniak kMail

    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 acro...

    https://www.infomaniak.com
    Learn More
  6. FairEmail icon

    FairEmail

     87 likes
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    Open-source, privacy-focused email client offering features such as encryption via OpenPGP and S/MIME, unlimited accounts, a unified inbox, customizable settings, and reformatted emails to prevent phishing. Supports two-way synchronization and provides Pro features for additional customization.

    43 FairEmail alternatives

    Cost / License

    • Freemium (Pay once)
    • Open Source

    Application type

    Platforms

    • Android
    • Android Tablet
    • F-Droid
    Compose message view.
    Setup screen.
    Messages view with dark theme.
     
  7. Posteo icon

    Posteo

     83 likes
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    Web- and IMAP-based email service. 2GB cost 1€/month. Information is hosted on encrypted hard drives. Electricity from renewable resources is used.

    74 Posteo alternatives

    Cost / License

    • Subscription
    • Open Source

    Application types

    Platforms

    • Online
    Drag and drop
     
  8. Infomaniak kMail icon

    Infomaniak kMail

     38 likes
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    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.

    42 Infomaniak kMail alternatives

    Cost / License

    • Freemium (Subscription)
    • Open Source

    Application types

    Platforms

    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • F-Droid
    Infomaniak kMail screenshot 1
     
  10. Kolab Now icon

    Kolab Now

     42 likes
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    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.

    78 Kolab Now alternatives

    Cost / License

    • Subscription
    • Open Source

    Application types

    Platforms

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

    Horde

     29 likes
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    Horde Groupware is a free, enterprise ready, browser based collaboration suite. Users can manage and share calendars, contacts, tasks and notes with the standards compliant components from the Horde Project.

    Cost / License

    • Free
    • Open Source

    Application type

    Alerts

    • Discontinued

    Platforms

    • Online
    • Self-Hosted
    Horde screenshot 1
     

    • Horde is the most popular Self-Hosted alternative to Zoho Mail.

    • Horde is Free and Open SourceZoho Mail is Freemium and Proprietary
  12. Librem Mail icon

    Librem Mail

     3 likes
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    End-to-end encrypted email used by nearly everybody already.

    Cost / License

    • Subscription
    • Open Source

    Application type

    Platforms

    • Android
    • Android Tablet
    Librem Mail screenshot 1
    Librem Mail screenshot 2
    Librem Mail screenshot 3
     
  13. Swisscows.email icon

    Swisscows.email

     5 likes
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    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

    • Subscription
    • Open Source

    Application types

    Platforms

    • Online
    • iPhone
    • iPad
    • Android
    • Android Tablet
    Swisscows.email screenshot 1
     
  14. Ltt.rs icon

    Ltt.rs

     3 likes
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    No-frills, easy to use, easy to maintain Email client for Android based on the JSON Meta Application Protocol (JMAP).

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Android
    • F-Droid
    Ltt.rs screenshot 1
    Ltt.rs screenshot 2
    Ltt.rs screenshot 3
     
  15. AfterLogic Aurora icon

    AfterLogic Aurora

     Like
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    Afterlogic Aurora is an enterprise collaboration system for small and medium-sized business. Aurora provides collaboration of webmail, contacts, calendar, files and helpdesk modules.

    Cost / License

    • Pay once
    • Open Source

    Application types

    Platforms

    • Windows
    • Online
    • Android
    • iPhone
    • Self-Hosted
    AfterLogic Aurora screenshot 1
     
12 of 25 Zoho Mail alternatives