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, Windows, Linux, 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

     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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    37
    Comments about Thunderbird as an Alternative to K-9 Mail
    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
    0

    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.

    K-9 Mail Icon
    Thunderbird icon

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

    • Thunderbird is the most popular Windows, Android, Mac & Linux alternative to K-9 Mail.

    • Thunderbird is the most popular Open Source & free alternative to K-9 Mail.

    • 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

     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.
     
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    19
    Comments about FairEmail as an Alternative to K-9 Mail
    LongLife
    Positive
    0

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

    K-9 Mail Icon
    FairEmail icon

    • Almost everyone thinks FairEmail is a great K-9 Mail alternative.

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

    • 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
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    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.

    126 Microsoft Outlook alternatives

    Cost / License

    • Pay once or Subscription
    • Proprietary

    Application types

    Platforms

    • Mac
    • Windows
    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Apple Watch
    • Android Wear
    Microsoft Outlook screenshot 1
     
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    Comments about Microsoft Outlook as an Alternative to K-9 Mail
    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.
    K-9 Mail Icon
    Microsoft Outlook icon

    • This alternative is disputed. Microsoft Outlook is a legitimate K-9 Mail alternative, but it might have issues that some users think are important.

    • Microsoft Outlook is the most popular Web-based, iPhone & iPad alternative to K-9 Mail.

    • Microsoft Outlook is the most popular commercial alternative to K-9 Mail.

    • Microsoft Outlook is Paid and ProprietaryK-9 Mail is Free and Open Source
  5. Ad
    Screenshot
    Superhuman Mail icon
    Superhuman Mail

    Productivity-centered email application streamlines inbox management, uses AI for drafting responses, automates snippets, summarizes conversations, enables timely sends, integrates calendar and CRM, and includes collaborative fea...

    https://superhuman.com
    Learn More
  6. Spark Mail icon

    Spark Mail

     137 likes
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    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 (Subscription)
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Android
    • iPhone
    • iPad
    • Apple Watch
    Spark Mail screenshot 1
     
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    8
    Comments about Spark Mail as an Alternative to K-9 Mail
    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.

    K-9 Mail Icon
    Spark Mail icon

    • Almost everyone thinks Spark Mail is a great K-9 Mail alternative.

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

    Infomaniak kMail

     38 likes
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    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.

    42 Infomaniak kMail alternatives

    Cost / License

    • Freemium (Subscription)
    • Open Source

    Application types

    Platforms

    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • F-Droid
    Infomaniak kMail screenshot 1
     
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    1
    Comments about Infomaniak kMail as an Alternative to K-9 Mail
    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.
    K-9 Mail Icon
    Infomaniak kMail icon
    • Infomaniak kMail is Freemium and Open SourceK-9 Mail is Free and Open Source
  8. Canary Mail icon

    Canary Mail

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

    62 Canary Mail alternatives

    Cost / License

    • Freemium (Pay once or Subscription)
    • Proprietary

    Application type

    Platforms

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

    BlueMail

     33 likes
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    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.

    32 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
    BlueMail screenshot 2
    BlueMail screenshot 3
     
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  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. Shortwave icon

    Shortwave

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

    Cost / License

    • Freemium (Subscription)
    • Proprietary

    Application type

    Platforms

    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Gmail
    Shortwave screenshot 1
    Shortwave screenshot 2
    Shortwave screenshot 3
     
  13. TypeApp icon

    TypeApp

     30 likes
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    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.

    54 TypeApp alternatives

    Cost / License

    • Free Personal
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Android Wear
    • Kindle Fire
    TypeApp screenshot 1
     
  14. 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
     
  15. Aqua Mail icon

    Aqua Mail

     12 likes
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    AquaMail is an email app for Internet and Exchange mail, for Android 4.0.3 and higher.

    24 Aqua Mail alternatives

    Cost / License

    • Freemium (Pay once)
    • Proprietary

    Application type

    Platforms

    • Android
    • Android Tablet
    Aqua Mail screenshot 1
     
12 of 21 K-9 Mail alternatives