Apple Mail AlternativesOnly Open Source apps categorised as Calendar Apps

The best open source Calendar alternative to Apple Mail is Thunderbird. If that doesn't suit you, our users have ranked more than 100 alternatives to Apple Mail and nine of them are open source Calendar Apps so hopefully you can find a suitable replacement. Other interesting open source Calendar App alternatives to Apple Mail are Proton Mail, Tuta Mail, Betterbird and Evolution.

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Alternatives list

  1. Thunderbird icon

    Thunderbird

     2529 likes
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    Cross-platform email client supporting multiple identities, chat, and strong filtering. Extend functionality with add-ons like RSS/Atom feed readers and PGP support.

    86 Thunderbird alternatives

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • BSD
    • AppImageHub
    • Snapcraft
    • Flathub
    • PortableApps.com
    • F-Droid
    • Haiku
    • Homebrew
    • Chocolatey
    Thunderbird screenshot 1
     
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    4
    40
    Comments about Thunderbird as an Alternative to Apple Mail
    Guest
    Negative
    23

    It has too crowded a look to listing email. Compare the wide screen view of both. Thunderbird puts all the details on one line, apple uses multiple lines and gives whitespace between mails.

    Review by a new / low-activity user.
    Guest
    Negative
    7

    Looks like piece of crap. Intrface is like from windows 98. Rediculous UX design.

    Review by a new / low-activity user.
    Kelson V
    Positive
    0

    Thunderbird can do more than Apple Mail, it's stable, the 2023 update has improved the UI a lot, and I can also run it on Windows and Linux.

    Show more comments
    3 of 4 comments
    Apple Mail Icon
    Thunderbird icon

    • Most users think Thunderbird is a great Apple Mail alternative.

    • Thunderbird is the most popular Windows, Android, Mac & Linux alternative to Apple Mail.

    • Thunderbird is the most popular Open Source & free alternative to Apple Mail.

    • Thunderbird is Free and Open SourceApple Mail is Free and Proprietary
    • Thunderbird is Privacy focusedApple Mail is not according to our users
  2. Proton Mail icon

    Proton Mail

     1020 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
     

    • Proton Mail is the most popular Web-based, iPhone & iPad alternative to Apple Mail.

    • Proton Mail is Freemium and Open SourceApple Mail is Free and Proprietary
    • Proton Mail is Privacy focusedApple Mail is not according to our users
  4. Tuta Mail icon

    Tuta Mail

     519 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
     
  5. Ad
    Screenshot
    Proton Mail icon
    Proton Mail

    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 devi...

    https://proton.me
    Learn More
  6. Betterbird icon

    Betterbird

     70 likes
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    Betterbird, a soft fork of Mozilla Thunderbird, improves user experience with advanced features, bug fixes, security patches, and multi-row descriptions similar to Outlook. Compatible with multiple platforms and can be used alongside Thunderbird, sharing the same profile.

    28 Betterbird alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Flathub
    • Chocolatey
    Betterbird screenshot 1
     
  7. Evolution icon

    Evolution

     205 likes
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    Evolution is a personal information management application that provides integrated mail, calendaring, address book and task list functionality.

    69 Evolution alternatives

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Linux
    • BSD
    • Flathub
    • S/MIME
    • GNOME
    • OpenPGP
    Mail
     
  8. 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
     
  10. Claws Mail icon

    Claws Mail

     106 likes
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    Email and news client on GTK+ foundation featuring quick performance, extensible plugins, secure protocols, advanced filtering, strong folder and contact management, lightweight design, powerful search, customizable interface, multi-language support, and encryption.

    62 Claws Mail alternatives

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Windows
    • Linux
    • BSD
    The main window
     
  12. Scribe Mail icon

    Scribe Mail

     7 likes
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    Scribe is a small portable email client with an intergrated contact database and calendar. It supports all the major internet mail protocols and uses international standards where possible. Scribe doesn't required installing or uninstalled and can be used from a removable...

    39 Scribe Mail alternatives

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Haiku
    Main window
     
9 of 9 Apple Mail alternatives