K-9 Mail Alternatives for Android

There are many alternatives to K-9 Mail for Android if you are looking for a replacement. The best Android alternative is Thunderbird, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to K-9 Mail and many of them are available for Android so hopefully you can find a suitable replacement. Other interesting Android alternatives to K-9 Mail are FairEmail, Microsoft Outlook, Spark Mail and Infomaniak kMail.

filter to find the best alternatives

K-9 Mail alternatives are mainly Email Clients, but if you're looking for Calendar Apps or Contact Managers you can filter on that. Other popular filters include iPhone, Linux, Windows, Android and Android + Open Source. These are just examples - use the filter bar below to find more specific alternatives to K-9 Mail.
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Alternatives list

  1. Thunderbird icon

    Thunderbird

     2559 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.

    87 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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    2
    Thunderbird vs K-9 Mail Comments
    Tubby 9417
    Positive
    0

    A really great client used by many, popular because it supports almost every mail provider (not proton ?), and mail providers provide documentation to integrate with Thunderbird. I recommand

    Diatomee
    1

    Afaik the Thunderbird for Android and K-9 mail are developed by the same team now and have the same infrastructure under the hood, therefore it doesn't make any difference which one you choose.

    • Thunderbird is Free and Open SourceK-9 Mail is also Free and Open Source
    • Thunderbird is CustomizableK-9 Mail is not according to our users
  2. FairEmail icon

    FairEmail

     88 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.

    44 FairEmail alternatives

    Cost / License

    Application type

    Platforms

    • Android
    • Android Tablet
    • F-Droid
    Compose message view.
     
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    1
    FairEmail vs K-9 Mail Comments
    LongLife
    Positive
    0

    Both are opensource, privacy oriented, free email clients for Android

    • FairEmail is Freemium and Open SourceK-9 Mail is Free and Open Source
    • FairEmail is CustomizableK-9 Mail is not according to our users
  4. Microsoft Outlook icon

    Microsoft Outlook

     397 likes

    Streamline emails, calendars, contacts, and task management with a smart inbox prioritizing critical messages. Includes calendar scheduling, third-party app integration like Facebook, Dropbox, and Trello, and support for Microsoft Exchange, Outlook.com, and Gmail, ensuring efficient task and email handling.

    128 Microsoft Outlook alternatives

    Cost / License

    • Paid
    • Proprietary

    Application types

    Platforms

    • Mac
    • Windows
    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Apple Watch
    • Android Wear
    Microsoft Outlook screenshot 1
     
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    2
    Microsoft Outlook vs K-9 Mail Comments
    Guest
    Negative
    5

    Microsoft Office Outlook has more vulnerabilities and so far, seems more of a memory hogger on my device than K-9 Mail. Thank you, K-9 Mail!

    Review by a new / low-activity user.
    Guest
    Negative
    0

    If you use outlook for another email it will strore the password on a Microsoft server

    Review by a new / low-activity user.
    • Microsoft Outlook is Paid and ProprietaryK-9 Mail is Free and Open Source
  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. Spark Mail icon

    Spark Mail

     139 likes

    E-mail app with all the great features: swipes (long/short), snooze, add (multiple) attachments from the cloud, support for various e-mail services and more.

    62 Spark Mail alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Android
    • iPhone
    • iPad
    • Apple Watch
    Spark Mail screenshot 1
     
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    1
    Spark Mail vs K-9 Mail Comments
    abogawat
    Positive
    0

    Spark is one of the most polished email clients out there, with multi-platform support and an excellent feature set. The free version is good enough for most people.

    • Spark Mail is Freemium and ProprietaryK-9 Mail is Free and Open Source
  7. Infomaniak kMail icon

    Infomaniak kMail

     44 likes

    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.

    47 Infomaniak kMail alternatives

    Cost / License

    Application types

    Platforms

    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • F-Droid
    Infomaniak kMail screenshot 1
     
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    1
    Infomaniak kMail vs K-9 Mail Comments
    Guest
    Negative
    0

    The Infomaniak client only works with Infomaniak mail accounts, while K-9 Mail supports all mail accounts that use the standard IMAP and SMTP protocols

    Review by a new / low-activity user.
    • Infomaniak kMail is Freemium and Open SourceK-9 Mail is Free and Open Source
  8. Canary Mail icon

    Canary Mail

     29 likes

    Canary can write your emails, prioritize what needs attention, silence spam & much more. Say hello to your Inbox Copilot!

    64 Canary Mail alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Apple Watch
    iOS-1
     
  10. BlueMail icon

    BlueMail

     33 likes

    BlueMail is a modern, mobile first, powerful Email management tool with a sleek design, unified inbox and support for all your accounts: IMAP,Exchange,POP3.

    34 BlueMail alternatives

    Cost / License

    • Free Personal
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Chrome OS
    • Android Tablet
    • iPad
    • Apple Watch
    BlueMail 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. Shortwave icon

    Shortwave

     15 likes

    Shortwave is an email app that takes the pain out of managing your inbox, making it effortless to stay organized, productive, and responsive.

    19 Shortwave alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Gmail
    Shortwave screenshot 1
     
  13. Edison Mail icon

    Edison Mail

     9 likes

    Email by Edison (formerly Email by EasilyDo) is a brand new, elegantly designed, universal mail app to manage unlimited mail accounts.

    19 Edison Mail alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Windows
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Samsung Galaxy Store
    Edison Mail screenshot 1
     
  14. TypeApp icon

    TypeApp

     30 likes

    TypeApp is an all-free, beautifully designed, universal email app, capable of managing unlimited number of mail accounts from various providers, allowing for smart push notifications while enabling personalization across multiple email accounts.

    Cost / License

    • Free Personal
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Android Wear
    • Kindle Fire
    TypeApp screenshot 1
     
12 of 21 K-9 Mail alternatives