Best Thunderbird Alternatives in 2021

    Thunderbird is described as 'free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is modeled after Mozilla Firefox' and is one of the leading apps in the News & Books category. There are more than 50 alternatives to Thunderbird for a variety of platforms, including Windows, Mac, Linux, Android and iPhone. The best alternative is K-9 Mail, which is both free and Open Source. Other great apps like Thunderbird are eM Client (Freemium), Evolution (Free, Open Source), Feedly (Freemium) and Claws Mail (Free, Open Source).

    This page was last updated Jun 24, 2021

    1. A whole new way of using email. Reimagined for the modern age, it transforms the way you communicate, share media, interact with notifications, manage your inbox, stay productive or track updates from your favorite publishers and brands.
      • Android
      • S/MIME
      • OpenPGP
      Need a great working email client on Android? MailDroid is the one you should download! Has the power of Outlook and Thunderbird for your Android device.
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      MailDroid vs Thunderbird opinions
      Most users think MailDroid is a great alternative to Thunderbird.
      A long term reliable solution for Android. Run for many years now and works as well on Android as Thunderbird does on PC
      Positive comment over 4 years ago

      wrong platform - maildroid is for android only, thunderbird is for desktops
      Negative comment 10 months ago

      yahoobob Communicates direct to the servers, does not leave anything in the cloud or with 3rd party servers.
      Positive comment about 4 years ago


      • Mac
      • Android
      • iPhone
      • Android Tablet
      • iPad
      • Apple Watch
      Canary is an exciting new email client for Mac that offers a full set of powerful features with one key difference - your emails are not stored on a 3rd party server.
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    2. Live chat software for small businesses and startups. All-in-one customer platform: Modern Live chat + Email Marketing automation + Ticketing software for Medium & Large size businesses.
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      • FreeOpen Source
      • Mac
      • Linux
      Kube is a modern communication and collaboration client built with QtQuick on top of a high performance, low resource usage core. It provides online and offline access to all your mail, contacts, calendars, notes, todo's and more.
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    3. FileOne is an organizer that combines and integrates your notes, documents, contacts, email, photo's/images, calendar and agenda with multimedia.
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    4. The most powerful platform for email productivity in a beautiful native app — on desktop and mobile.
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    5. Fast and Simple Email Client for Mac.
    6. Interlink Mail & News is a free e-mail client based on open source community code built on the Unified XUL Platform. It is available for Microsoft Windows and Linux (with other operating systems in development).
      Interlink Mail & News vs Thunderbird opinions
      pros, cons and recent comments
      Based on the same code as the original Thunderbird.
      Positive comment almost 2 years ago

    7. Foxmail is a free POP3 and IMAP4 e-mail client in English and Chinese for Windows systems.
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      Foxmail vs Thunderbird opinions
      pros, cons and recent comments
      The UI interface is greater, it has many great functions like notes, calendars, tags, etc. It could use POP, IMAP and Exchange accounts.
      Positive comment about 3 years ago

    Showing 40 of 89 alternatives