Thunderbird AlternativesOnly apps categorised as Web Browsers

The best Web Browser alternative to Thunderbird is SeaMonkey, 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 Web Browsers.

filter to find the best alternatives

Thunderbird alternatives are mainly Email Clients, but if you're looking for Web Browsers or IRC Clients you can filter on that. Other popular filters include Windows + Open Source. 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.
Thunderbird iconThunderbird
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Cross-platform email client providing POP/IMAP support, robust filtering, multiple accounts, and chat. Extendable via add-ons with RSS/Atom, etc.

More about Thunderbird
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Thunderbird alternatives page was last updated May 16, 2025
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  1. SeaMonkey icon

    SeaMonkey

     235 likes
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    Web-browser, advanced e-mail, newsgroup and feed client, IRC chat, and HTML editing in one application. Itis built on the open source Mozilla Gecko engine, the same code which underlies Thunderbird and is the base for the Firefox browser.

    179 SeaMonkey alternatives

    License model

    • Free • Open Source

    Application types

    Country of Origin

    • US flagUnited States

    Platforms

    • Mac
    • Windows
    • Linux
    • BSD
    • PortableApps.com
    SeaMonkey screenshot 1

    Properties

    1.  Lightweight
    2.  Privacy focused
    3.  Customizable

    Features

    1.  Integrated Email Client
    2.  Built-in RSS reader
    3.  Add-ons
    4.  Built-in Download Manager
    5.  WYSIWYG Support
    6.  Extensible by Plugins/Extensions
    7.  Portable
    8.  Ad-free
    9.  Support for Firefox extensions
    10.  Modular System

    SeaMonkey VS Thunderbird

     
    Comments about SeaMonkey as an Alternative to Thunderbird
    Most Recent Comment
    Guest
    Positive Nov 16, 2017
    21

    SeaMonkey is both a WEB BROWSER and EMAIL CLIENT. It's the successor of Mozilla Application Suite or Netscape Communicator, resp. Further it includes also a news client program, an HTML editor (SeaMonkey Composer) and an IRC client (ChatZilla).

    apostolfaliagas
    Positive Feb 19, 2018
    15

    It has all of Thunderbird's features and many more.

    Guest
    Negative Mar 28, 2022
    0

    Unfortunately doesn't support synchronization with CardDAV address books.

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    3 of 4 comments
    Thunderbird Icon
    SeaMonkey icon

    • Some users think SeaMonkey is a great Thunderbird alternative, some don't.

    • SeaMonkey is Free and Open SourceThunderbird is also Free and Open Source
    • SeaMonkey is Lightweight and Privacy focusedThunderbird is not according to our users
  2. Iceape-UXP icon

    Iceape-UXP

     Like
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    Historically, Iceape was a re-branding of SeaMonkey by the Debian project. However, Debian discontinued Iceape in December 2013 citing security concerns and lack of a maintainer.

    License model

    • Free • Open Source

    Application types

    Country of Origin

    • BR flagBrazil

    Platforms

    • Linux

    Iceape-UXP VS Thunderbird

     
2 of 2 Thunderbird alternatives