Alternatives to K-9 Mail for all platforms with any license

  • Thunderbird icon

    Thunderbird

    Thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is modeled after...

    Open Source Mac Windows Linux BSD Haiku

  • Inbox by Gmail icon

    Inbox by Gmail

    Built on everything that we've learned from Gmail, Inbox is a fresh start that goes beyond email to help you get back to what...

    Free Web / Cloud Android iPhone iPad Chrome

  • Opera Mail icon

    Opera Mail

    Opera Mail powerfully organizes, indexes, and sorts your messages. It has spam filtering (both automated and Bayesian), supports...

    Free Mac Windows

  • Nylas N1 icon

    Nylas N1

    N1 is an email client designed to be friendly and easy to use but also powerful and highly extensible. It works "out of the...

    Freemium Mac Windows Linux Web / Cloud Self-Hosted

  • Claws Mail icon

    Claws Mail

    Claws Mail is an email client (and news reader), based on GTK+, featuring Quick response Graceful, and sophisticated...

    Open Source Windows Linux BSD Xfce

  • Airmail icon

    Airmail

    Airmail is a lightweight and lightning fast mail client for Mac. Feature list: Accounts: - Unified Inbox and folders - Multi...

    Commercial Mac iPhone iPad Apple Watch

  • Sparrow icon

    Sparrow Discontinued

    Sparrow is a minimalist mail application for Mac. It was designed to keep things simple and efficient. No fancy stuff here... just...

    Commercial Mac iPhone

  • CloudMagic icon

    CloudMagic

    The email app that gets work done. Works with Gmail, Exchange, Yahoo, Outlook, iCloud, Google Apps, Office 365 and any IMAP account. ...

    Freemium Mac Android iPhone Android Tablet iPad Apple Watch ... Android Wear

  • Mail Wise icon

    Mail Wise

    Mail Wise – Read Just What You Need. The best conversation threads ever. A free email client that transforms messy emails into clean...

    Freemium Android

  • FossaMail icon

    FossaMail

    FossaMail is an Open Source, Mozilla Thunderbird -based mail, news and chat client for Windows and Linux, brought to you by...

    Open Source Windows Linux

  • Know any more alternatives to K-9 Mail?

    Suggest an application to this list
  • Spark icon

    Spark

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

    Free iPhone iPad Apple Watch

  • GyazMail icon

    GyazMail

    GyazMail is a email client software for Mac OS X, based on Cocoa framework, simple, easy-to-use with many features.

    Commercial Mac

  • TypeApp icon

    TypeApp

    TypeApp is an all-free, beautifully designed, universal email app, capable of managing unlimited number of mail accounts from various...

    Free Personal Android iPhone Android Tablet iPad Android Wear Kindle Fire

  • Columba icon

    Columba Discontinued

    Columba is an email client written in Java, featuring a user-friendly graphical interface with wizards and internalionalization...

    Open Source Mac Windows Linux BSD

  • SlideMail icon

    SlideMail

    Making email better through artificial intelligence.

    Free iPhone

  • Aqua Mail icon

    Aqua Mail

    AquaMail is an email app for Internet and Exchange mail, for Android 4.0.3 and higher. Easy automatic setup for popular email...

    Freemium Android Android Tablet

  • Share this list of alternatives?

  • EmailTray icon

    EmailTray

    EmailTray is a smart email client and an email notifier for POP3 and IMAP email accounts, including Gmail, Hotmail, Yahoo mail and...

    Free Windows Android

  • Mailburn icon

    Mailburn

    Mailburn is an iPhone email client that shows your conversations with real people as chats, without "Show quoted text" and...

    Freemium iPhone iPad

  • Koma-Mail icon

    Koma-Mail Discontinued

    Koma-Mail is an email client which is comfortable and has very handy functions. It does not need an installation, so that you can run...

    Free Windows

  • ProfiMail icon

    ProfiMail

    ProfiMail is a powerful email client for mobile phones. It allows you to read your mail on the go, and send text with attachments...

    Freemium Windows Mobile Android S60 Android Tablet

  • TrulyMail icon

    TrulyMail

    TrulyMail is an email client and a private messaging system, very feature rich (voice recording, script blocking, etc.). Features:...

    Free Windows

  • Mailroom icon

    Mailroom

    Mailroom provides seamless integration between Gmails world class mobile web app and familiar iPhone conventions, along with...

    Commercial iPhone

  • mBoxMail icon

    mBoxMail

    mBox Mail is a fast, full-featured Hotmail client for iOS devices. It offers full access and control of your Windows Live Hotmail...

    Commercial iPhone

  • mailPro icon

    mailPro Discontinued

    mailPro is a Hotmail, MSN & Windows Live account manager, with essential features to keep your email synchronized. The native...

    Freemium iPhone