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

Alternatives list

1. 

   

   Thunderbird

    2636 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.

   102 Thunderbird alternatives

   Cost / License

   • Free
   • Open Source (MPL-2.0)

   Application typeApplication types

   • Email Client
   • Calendar

   Origin

   • United States

   Platforms

   • Windows
   • Linux
   • Android
   • BSD
   • AppImageHub
   • Snapcraft
   • Flathub
   • PortableApps.com
   • F-Droid
   • OpenAPK
   • Homebrew
   • Chocolatey
   • Obtainium

   • United States

   

   

   

   +7

   

   More about Thunderbird  

   

   Good alternative?Is Thunderbird a good alternative to Spark Mail?

    

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   6comments

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   Thunderbird vs Spark Mail Comments

   Top Positive Comment by hra72 · Jul 7, 2024

   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.

   Top Negative Comment by Guest · Mar 11, 2019

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

   Positive comment by tcdave · May 12, 2026

   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

    376 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.

   49 K-9 Mail alternatives

   Cost / License

   • Free
   • Open Source (Apache-2.0)

   Application type

   • Email Client

   Origin

   • International

   Platforms

   • Android
   • Android Tablet
   • F-Droid
   • OpenAPK

   • Global

   

   

   

   More about K-9 Mail  

   

   Good alternative?Is K-9 Mail a good alternative to Spark Mail?

    
4. 

   

   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.

   55 Mailspring alternatives

   Cost / License

   • Freemium
   • Open Source (GPL-3.0)

   Application type

   • Email Client

   Origin

   • United States

   Platforms

   • Mac
   • Windows
   • Linux
   • Arch Linux
   • Fedora
   • Ubuntu

   • United States

   

   

   

   +1

   

   More about Mailspring  

   

   Good alternative?Is Mailspring a good alternative to Spark Mail?

    

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   3comments

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   Mailspring vs Spark Mail Comments

   Positive comment by Guest · Feb 28, 2020

   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.

   Comment by Thomas Klinger · May 8, 2022

   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.

   Positive comment by Guest · Mar 13, 2018

   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.

   3 of 3 comments

   

   

   • Mailspring is Freemium and Open SourceSpark Mail is Freemium and Proprietary
   • Mailspring is CustomizableSpark Mail is not according to our users
5. 

   

   FairEmail

    93 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.

   50 FairEmail alternatives

   Cost / License

   • Freemium
   • Open Source (GPL-3.0)

   Application type

   • Email Client

   Origin

   • Netherlands
   • EU

   Platforms

   • Android
   • Android Tablet
   • F-Droid
   • OpenAPK

   • Netherlands
   • EU

   

   

   

   More about FairEmail  

   

   Good alternative?Is FairEmail a good alternative to Spark Mail?

    
6. 

   

   Evolution

    212 likes

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

   77 Evolution alternatives

   Cost / License

   • Free
   • Open Source (LGPL-2.1)

   Application typeApplication types

   • Email Client
   • Calendar

   Origin

   • United States

   Platforms

   • Linux
   • BSD
   • Flathub
   • S/MIME
   • GNOME
   • OpenPGP

   • United States

   

   

   

   +4

   

   More about Evolution  

   

   Good alternative?Is Evolution a good alternative to Spark Mail?

    

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   1comment

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   Evolution vs Spark Mail Comments

   Negative comment by CyCo · Jun 15, 2024

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

   1 of 1 comments

   

   

   • Evolution is Free and Open SourceSpark Mail is Freemium and Proprietary
8. 

   

   Pelton

    14 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.

   Cost / License

   • Free
   • Open Source (GPL-3.0)

   Application type

   • Email Client

   Origin

   • Germany
   • EU

   Platforms

   • Mac
   • Windows
   • Linux

   • Germany
   • EU

   

   

   

   More about Pelton  

   

   Good alternative?Is Pelton a good alternative to Spark Mail?

    
9. 

   

   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.

   73 Claws Mail alternatives

   Cost / License

   • Free
   • Open Source

   Application typeApplication types

   • Email Client
   • Calendar

   Platforms

   • Windows
   • Linux
   • BSD

   

   

   More about Claws Mail  

   

   Good alternative?Is Claws Mail a good alternative to Spark Mail?

    

   |

   2comments

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   Claws Mail vs Spark Mail Comments

   Negative comment by CyCo · Jun 15, 2024

   The 90s called, they want their design back

   Positive comment by Thomas Klinger · May 8, 2022

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

   2 of 2 comments

   

   

   • 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
10. 

    

    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

    • Freemium
    • Open Source (GPL-3.0)

    Application type

    • Email Client

    Origin

    • Türkiye

    Platforms

    • Windows

    • Türkiye

    

    

    

    +2

    

    More about Wino Mail  

    

    Good alternative?Is Wino Mail a good alternative to Spark Mail?

     
11. 

    

    Ltt.rs

     4 likes

    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 (Apache-2.0)

    Application type

    • Email Client

    Origin

    • Germany
    • EU

    Platforms

    • Android
    • F-Droid

    • Germany
    • EU

    

    

    

    More about Ltt.rs  

    

    Good alternative?Is Ltt.rs a good alternative to Spark Mail?

     
12. 

    

    Meron

     2 likes

    Fast/secure email client with kanban and chat views.

    Cost / License

    • Free
    • Open Source (AGPL-3.0)

    Application type

    • Email Client

    Origin

    • Japan

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • iPad
    • Snapcraft
    • Flathub
    • F-Droid
    • Ubuntu
    • Flatpak

    • Japan

    

    

    

    +7

    

    More about Meron  

    

    Good alternative?Is Meron a good alternative to Spark Mail?

     
13. 

    

    Librem Mail

     3 likes

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

    Cost / License

    • Paid
    • Open Source

    Application type

    • Email Client

    Origin

    • United States

    Platforms

    • Android
    • Android Tablet

    • United States

    

    

    

    More about Librem Mail  

    

    Good alternative?Is Librem Mail a good alternative to Spark Mail?

     
14. 

    

    Kanmail

     2 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

    • Email Client

    Origin

    • United Kingdom

    Platforms

    • Mac
    • Windows
    • Linux

    • United Kingdom

    

    

    

    +1

    

    More about Kanmail  

    

    Good alternative?Is Kanmail a good alternative to Spark Mail?