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 17 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Spark Mail are K-9 Mail, Evolution, Mailspring and FairEmail.

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Alternatives list

  1. Thunderbird icon

    Thunderbird

     2603 likes

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

    95 Thunderbird alternatives

    Cost / License

    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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    6
    Thunderbird vs Spark Mail Comments
    Top Positive Comment
    Guest
    1

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

    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.

    tcdave
    Positive
    0

    I like Thunderbird as an open source alternative, easy to use

    3 of 6 comments
    • 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

     375 likes

    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.

    45 K-9 Mail alternatives

    Cost / License

    Application type

    Platforms

    • Android
    • Android Tablet
    • F-Droid
    K-9 Mail screenshot 1
     
  4. Evolution icon

    Evolution

     211 likes

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

    72 Evolution alternatives

    Cost / License

    Application types

    Platforms

    • Linux
    • BSD
    • Flathub
    • S/MIME
    • GNOME
    • OpenPGP
    Mail
     
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    1
    Evolution vs Spark Mail Comments
    CyCo
    Negative
    1

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 Very outdated methods for getting started.

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

    Mailspring

     118 likes

    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.

    49 Mailspring alternatives

    Cost / License

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Arch Linux
    • Fedora
    • Ubuntu
    Clean design with integrated search and swipe gestures
     
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    3
    Mailspring vs Spark Mail Comments
    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.

    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.

    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.

    • Mailspring is Freemium and Open SourceSpark Mail is Freemium and Proprietary
    • Mailspring is CustomizableSpark Mail is not according to our users
  7. FairEmail icon

    FairEmail

     94 likes

    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.

    46 FairEmail alternatives

    Cost / License

    Application type

    Platforms

    • Android
    • Android Tablet
    • F-Droid
    Compose message view.
     
  8. Claws Mail icon

    Claws Mail

     105 likes

    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.

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Windows
    • Linux
    • BSD
    The main window
     
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    2
    Claws Mail vs Spark Mail Comments
    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.

    • 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. Pelton icon

    Pelton

     11 likes

    Free, open-source client for Windows, macOS, and Linux, offering local email storage and search online or offline, privacy-focused with no telemetry or third-party servers, IMAP and SMTP support, intuitive interface, and multiple account support.

    18 Pelton alternatives

    Cost / License

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    Pelton screenshot 1
     
  10. Wino Mail icon

    Wino Mail

     8 likes

    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

    Application type

    Platforms

    • Windows
    Wino Mail screenshot 1
     
  11. Ltt.rs icon

    Ltt.rs

     3 likes

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

    Cost / License

    Application type

    Platforms

    • Android
    • F-Droid
    Ltt.rs screenshot 1
     
  12. Librem Mail icon

    Librem Mail

     3 likes

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

    Cost / License

    • Paid
    • Open Source

    Application type

    Platforms

    • Android
    • Android Tablet
    Librem Mail screenshot 1
     
  13. Kanmail icon

    Kanmail

     3 likes

    Transform chaotic inboxes into organized workflows. See all your email folders as kanban columns. Combine all your Gmail, Outlook and more accounts into one unified view.

    Cost / License

    • Freemium
    • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    Kanmail contrast (default) theme
     
  14. Nylas Mail Lives icon

    Nylas Mail Lives

     3 likes

    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 (MIT)

    Application type

    Alerts

    • Discontinued

    Platforms

    • Mac
    • Windows
    • Linux
    • Self-Hosted
    Nylas Mail Lives screenshot 1
     
12 of 17 Spark Mail alternatives