Open Source Spark Mail AlternativesTop Email Clients and other similar apps like Spark Mail

The best open source alternative to Spark Mail is Thunderbird. If that doesn't suit you, our users have ranked more than 50 alternatives to Spark Mail and 15 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Spark Mail are K-9 Mail, Evolution, FairEmail and Mailspring.

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Alternatives list

  1. Thunderbird icon

    Thunderbird

     2530 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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    5
    23
    Comments about Thunderbird as an Alternative to Spark Mail
    Top Positive Comment
    Guest
    1

    There is NO Spark Version for Windows. That's why Thunderbird is the Best Alternative IMO.

    Review by a new / low-activity user.
    Top Negative Comment
    Guest
    10

    works like an old email client, downloading the message and saving in folders. It doesn't work syncing directly online with gmail labels.

    Review by a new / low-activity user.
    hra72
    Positive
    0

    Security & Privacy of Spark is questionable: "Data storage and encryption is secured through Google Cloud service." Thunderbird supports OpenPGP & S/MIME email encryption and is still completely free.

    Show more comments
    3 of 5 comments
    Spark Mail Icon
    Thunderbird icon

    • Some users think Thunderbird is a great Spark Mail alternative, some don't.

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

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

    • Thunderbird is Free and Open SourceSpark Mail is Freemium and Proprietary
    • Thunderbird is Customizable and Privacy focusedSpark Mail is not according to our users
  2. K-9 Mail icon

    K-9 Mail

     367 likes
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    K-9 is an open source email client for Android with multi-folder sync, email signatures, Bcc-to-self, return-address configuration, keyboard shortcuts, Exchange Support, message flagging, IMAP deletes, saving attachments, configurable notifications and more.

    42 K-9 Mail alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Android
    • Android Tablet
    • F-Droid
    K-9 Mail screenshot 1
    K-9 Mail screenshot 2
    K-9 Mail screenshot 3
     
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    8

    • Most users think K-9 Mail is a great Spark Mail alternative.

    • K-9 Mail is the most popular Android Tablet alternative to Spark Mail.

    • K-9 Mail is Free and Open SourceSpark Mail is Freemium and Proprietary
    • K-9 Mail is Privacy focused and LightweightSpark Mail is not according to our users
  4. 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
     
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    1
    Comments about Evolution as an Alternative to Spark Mail
    CyCo
    Negative
    1

    It is a pain to get working with a business Office 365 account. Very outdated methods for getting started.

    Spark Mail Icon
    Evolution icon
    • Evolution is Free and Open SourceSpark Mail is Freemium and Proprietary
  5. 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.
     
  6. Mailspring icon

    Mailspring

     113 likes
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    Boost your productivity and send better email with Mailspring, a beautiful, fast email client for Mac, Windows, and Linux. Mailspring is free to use and an optional pro version adds read receipts, send later, reminders and more.

    43 Mailspring alternatives

    Cost / License

    • Freemium (Subscription)
    • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Arch Linux
    • Fedora
    • Ubuntu
    Clean design with integrated search and swipe gestures
     
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    3
    23
    Comments about Mailspring as an Alternative to Spark Mail
    Thomas Klinger
    0

    I tested it, generally it is ok, but it sometimes does not show new arrivals at the top of the list, even though the counter increases. However, good mail client, which does not need any clumsy registrations somewhere.

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

    As far as my usage history, the best alternative for spark mail is Mailspring in terms of UI and UX. Though it lacks some features I use Mailspring as my daily driver.

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

    It's the most similar, with the features most inline. It even looks the same in appearance, and all the menus and shortcut keys match.

    Review by a new / low-activity user.
    Spark Mail Icon
    Mailspring icon

    • Almost everyone thinks Mailspring is a great Spark Mail alternative.

    • Mailspring is Freemium and Open SourceSpark Mail is Freemium and Proprietary
    • Mailspring is CustomizableSpark Mail is not according to our users
  7. 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
     
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    2
    Comments about Claws Mail as an Alternative to Spark Mail
    CyCo
    Negative
    1

    The 90s called, they want their design back

    Thomas Klinger
    Positive
    -2

    It's a little bit old fashioned, but ok, it works.

    Review by a new / low-activity user.
    Spark Mail Icon
    Claws Mail icon
    • Claws Mail is Free and Open SourceSpark Mail is Freemium and Proprietary
    • Claws Mail is Lightweight, Customizable and Privacy focusedSpark Mail is not according to our users
  9. Wino Mail icon

    Wino Mail

     8 likes
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    Wino is a lightweight native mail client for Windows 10/11. It is still in active development. Main motivation for this project is to replace Mail & Calendar for Windows with modern Windows design without using web technologies for speed.

    Cost / License

    • Freemium (Pay once)
    • Open Source

    Application type

    Platforms

    • Windows
    Wino Mail screenshot 1
     
  10. LucaMail icon

    LucaMail

     9 likes
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    LucaMail is an open source, cross-platform email client. LucaMail is developed to provide cross-platform alternative to Email Clients that are really exists. LucaMail focuses on modern technologies as well as maintaining a user-friendly UI.

    Cost / License

    • Free
    • Open Source

    Application type

    Alerts

    • Discontinued

    Platforms

    • Mac
    • Windows
    • Linux
    LucaMail screenshot 1
     
  11. 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).

    56 Ltt.rs alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Android
    • F-Droid
    Ltt.rs screenshot 1
    Ltt.rs screenshot 2
    Ltt.rs screenshot 3
     
  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. Nylas Mail Lives icon

    Nylas Mail Lives

     3 likes
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    Nylas Mail Lives is a fork of Nylas Mail that fixes many longstanding issues, improves the client experience, and is committed to publish new releases.

    Cost / License

    • Free
    • Open Source

    Application type

    Alerts

    • Discontinued

    Platforms

    • Mac
    • Windows
    • Linux
    • Self-Hosted
    Nylas Mail Lives screenshot 1
     

    • Nylas Mail Lives is the most popular Self-Hosted alternative to Spark Mail.

    • Nylas Mail Lives is Free and Open SourceSpark Mail is Freemium and Proprietary
  14. Columba icon

    Columba

     6 likes
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    Columba is an email client written in Java, featuring a user-friendly graphical interface with wizards and internalionalization support. Its a powerful mail management tool with features to enhance your productivity and communication.

    Cost / License

    • Free
    • Open Source

    Application type

    Alerts

    • Discontinued

    Platforms

    • Mac
    • Windows
    • Linux
    • BSD
    Columba screenshot 1
     
12 of 15 Spark Mail alternatives