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

Platforms

Desktop

Mobile

Tablet

Web / Online

Wearable

Browsers

Indie / Classic

Other Platforms

  • 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 Discontinued

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

    Free Mac Windows

  • 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

  • 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 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 Apple Watch

  • Mailbox icon

    Mailbox Discontinued

    Mailbox is a completely redesigned inbox that makes email light, fast, and mobile-friendly. Quickly swipe messages to your archive or...

    Free Mac Android iPhone iPad

  • N1 icon

    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...

    Open Source Mac Windows Linux

  • 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

  • Inbox2 icon

    Inbox2 Discontinued

    Inbox2 is a premium connected lifestyle application that brings communication - and the people you communicate with - into a single...

    Open Source Windows Web / Cloud

  • Type Mail icon

    Type Mail

    was called blue mail. great multiprotocol client. my favourite (tried a few (including K9), forgot them all). here...

    Free Android Android Tablet

  • Spark E-mail icon

    Spark E-mail

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

    Free iPhone iPad

  • 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

  • Mailburn icon

    Mailburn

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

    Free iPhone iPad

  • Evomail icon

    Evomail Discontinued

    Email is stale. We’re driving email forward through innovation across all mail clients and server implementations -- with or without...

    Free iPhone iPad

  • 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

  • SuperAtic WebMail icon

    SuperAtic WebMail

    With Infinity WebMail , SuperAtic LABS started off as a European mail service, and after acquiring 1 million users they opened up a...

    Commercial Web / Cloud

  • 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

  • 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

  • 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...

    Commercial Windows Mobile Android S60

  • TrulyMail icon

    TrulyMail

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

    Free Windows

  • SlideMail icon

    SlideMail

    Making email better through artificial intelligence.

    Free iPhone

  • Mailroom icon

    Mailroom

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

    Commercial iPhone

  • Mailsmith icon

    Mailsmith

    A standards-based email client.

    Free Mac

  • 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