Thunderbird AlternativesOnly apps categorised as Encrypted Chat Apps

The best Encrypted Chat alternative to Thunderbird is K-9 Mail, which is both free and Open Source. If that doesn't work for you, our users have ranked more than 50 alternatives to Thunderbird, but unfortunately only two of them are Encrypted Chat Apps.

filter to find the best alternatives

Thunderbird alternatives are mainly Email Clients, but if you're looking for Encrypted Chat Apps or Group Chat Apps you can filter on that. Other popular filters include Linux, Open Source, EU, iPhone, Windows + Open Source, Windows and Free. You can also filter by region, for example EU-based alternatives if you prefer software developed in the European Union. These are just examples - use the filter bar below to find more specific alternatives to Thunderbird.
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Alternatives list

  1. K-9 Mail icon

    K-9 Mail

     367 likes

    K-9 is an open source email client for Android with multi-folder sync, email signatures, Bcc-to-self, return-address configuration, keyboard shortcuts, Exchange Support, message flagging, IMAP deletes, saving attachments, configurable notifications and more.

    42 K-9 Mail alternatives

    Cost / License

    Application type

    Platforms

    • Android
    • Android Tablet
    • F-Droid
    K-9 Mail screenshot 1
     
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    22
    K-9 Mail vs Thunderbird Comments
    Top Positive Comment
    kiminariyamamoto
    7

    Keeps the style of working with email as it should be, like we are used to from proper desktop Mail clients. It's unlike modern fancy clients with couple of buttons without even providing an option to view headers.

    Top Negative Comment
    ByteRanger
    6

    K-9 Mail is not for desktop operating systems, only Android. So you can't replace Thunderbird unless you are also replacing your desktop with a mobile device.

    jondemon
    Negative
    0

    K9 has nothing to do here. It's an android app

    3 of 22 comments
    • K-9 Mail is Free and Open SourceThunderbird is also Free and Open Source
    • K-9 Mail is LightweightThunderbird is not according to our users
  2. Spike icon

    Spike

     34 likes

    Transform your email inbox into a collaborative workspace with Spike. Enjoy integrated chat-like emails, tasks, collaborative notes, and group projects. Seamlessly manage multiple accounts, organize priorities, and schedule meetings across devices.

    61 Spike alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Online
    • Android
    • iPhone
    • Chrome OS
    • Android Tablet
    • iPad
    • Software as a Service (SaaS)
    • Meta Quest
    One powerful space for all your work needs—get email, chat, notes, tasks, calendar and audio/video calls all from your inbox
     
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    1
    Spike vs Thunderbird Comments
    Guest
    Positive
    1

    Native onlye for Android, iOS, Windows and Mac, not a Linux app

    Review by a new / low-activity user.
    • Spike is Freemium and ProprietaryThunderbird is Free and Open Source
2 of 2 Thunderbird alternatives