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Open Source 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 open source Android alternative is FairEmail. If that doesn't suit you, our users have ranked more than 25 alternatives to K-9 Mail and six of them are open source and available for Android so hopefully you can find a suitable replacement. Other interesting open source Android alternatives to K-9 Mail are Delta Chat, Librem Mail, Ltt.rs and Simple Email.

K-9 Mail alternatives are mainly Email Clients but may also be Calendar Apps or Encrypted Chat Apps. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of K-9 Mail.
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K-9 Mail iconK-9 Mail
  282
  • Android
  • Android Tablet
  • F-Droid

K-9 is an open source email client for Android with multi-folder sync, email signatures, Bcc-to-self, return-address...

Learn more about K-9 Mail

  1. FairEmail icon

    FairEmail

    • Android
    • Android Tablet
    • F-Droid
    44 alternatives to FairEmail 

    FairEmail is a privacy-focused email client with a setup wizard that helpfully walks you through the steps to use it with any email provider. There are many privacy settings including encryption via OpenPGP and S/MIME and reformatted emails to avoid phishing.

     Suggest and vote on features
    Features
    1.  Privacy focusedFairEmail is considered a privacy friendly alternative.
    2.  Multiple Account supportFairEmail support multiple accounts without the need to logout and login
    3.  PGP EncryptionFairEmail supports PGP, an encryption system used for sending encrypted emails and files.
    4.  Block TrackersFairEmail has a feature to block trackers from tracking you.
    5.  Calendar IntegrationFairEmail lets you sync your tasks and events with your calendar application.
    Compose message view.
    Setup screen.
    FairEmail vs K-9 Mail opinions
    Almost everyone thinks FairEmail is a great alternative to K-9 Mail.
  2. Delta Chat icon

    Delta Chat

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Android Tablet
    • FLATHUB
    • F-Droid
    53 alternatives to Delta Chat 

    Delta Chat looks and feels like other popular messenger apps, but does not involve centralized control, tracking or selling you, friends, colleagues or family out to large organizations. "Privacy by Design" has never been more fun.

     Suggest and vote on features
    Features
    1.  DecentralizedDelta Chat is based on a decentralized infrastructure with no single entity controlling it.
    Screenshot
    Screenshot


  3. Librem Mail icon

    Librem Mail

    • Android
    • Android Tablet
    • PureOS (Purism)
    43 alternatives to Librem Mail 

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

     Suggest and vote on features
    Features
    1.  End-to-End EncryptionLibrem Mail has E2E Encryption, for entire or parts of the app.
    Screenshot
    Screenshot
  4. Ltt.rs

    • FreeOpen Source
    • Android
    • F-Droid
    74 alternatives to Ltt.rs 

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

     Suggest and vote on features
    Features
    Screenshot
  5. Simple Email icon

    Simple Email

    14 alternatives to Simple Email 

    Free Software, minimalistic and privacy friendly email app for Android.

     Simple Email has no features, suggest some!
    Screenshot


  6. monocles mail icon

    monocles mail

    • FreemiumOpen Source
    • Online
    • Android
    • F-Droid
    41 alternatives to monocles mail 

    monocles mail is a fork of the K-9 mail version 5.600 with the old K-9 mail layout.

     monocles mail has no features, suggest some!
    Screenshot
Showing 6 of 6 alternatives
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