SeaMonkey Alternatives

SeaMonkey is described as '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' and is a very popular Web Browser in the web browsers category. There are more than 100 alternatives to SeaMonkey for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best SeaMonkey alternative is Mozilla Firefox, which is both free and Open Source. Other great apps like SeaMonkey are Thunderbird, Zen Browser, Brave and Google Chrome.

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SeaMonkey alternatives page was last updated

Alternatives list

  1. Opera Neon icon
     6 likes
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    Neon is an agentic AI browser that turns complex prompts into full-scale results. Automate tasks, turn intent into output, and get context-aware assistance all in one browser.

    70 Opera Neon alternatives

    Cost / License

    • Subscription
    • Proprietary

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
     
    • Opera Neon is the most popular commercial alternative to SeaMonkey.

    • Opera Neon is Paid and ProprietarySeaMonkey is Free and Open Source
  2. Privacy Browser icon
     21 likes
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    Privacy Browser protects your privacy by disabling features like JavaScript, DOM storage, and cookies that are used by websites to track users. Settings can be adjusted by domain and on-the-fly to enable these features when needed.

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Android
    • F-Droid
     
  3. Firefox ESR icon
     14 likes
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    Mozilla Firefox Extended Support Release is a community-led project that allows organizations to benefit from the speed, flexibility and security of Firefox while getting the support they need.

    54 Firefox ESR alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
     
  4. Copy a direct link to this comment to your clipboard

    Welcome to the MultiZen Browser project. This is an open-source multi-session browser, primarily designed for private browsing. It was developed out of a need for a substantial multi-session tool.

    Cost / License

    • Free
    • Open Source

    Application type

    Alerts

    • Discontinued

    Platforms

    • Mac
    • Windows
    • Linux
     
  5. Basilisk icon
     28 likes
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    Basilisk is a free and Open Source XUL-based web browser, featuring the well-known Firefox-style interface and operation. It is based on the Goanna layout and rendering engine (a fork of Gecko) and builds on the Unified XUL Platform (UXP), which in turn is a fork of the Mozilla...

    111 Basilisk alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
     
  6. Wino Mail icon
     8 likes
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    Wino is a lightweight native mail client for Windows 10/11. It is still in active development. Main motivation for this project is to replace Mail & Calendar for Windows with modern Windows design without using web technologies for speed.

    Cost / License

    • Freemium (Pay once)
    • Open Source

    Application type

    Platforms

    • Windows
     
  7. Copy a direct link to this comment to your clipboard

    Fast, secure browser blocking tracking, profiling, and ads. Offers real-time tracker blocking with an integrated private search. Syncs encrypted data for a seamless, smooth browsing experience across desktop, mobile, and tablet, prioritizing digital privacy and user control.

    Cost / License

    • Free
    • Proprietary

    Application type

    Platforms

    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
     
    • Tempest Browser is the most popular Web-based alternative to SeaMonkey.

    • Tempest Browser is Free and ProprietarySeaMonkey is Free and Open Source
  8. Lunascape icon
     51 likes
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    Lunascape is a web browser that handles all three major web rendering engines — Mozilla Firefox’s Gecko, Internet Explorer’s Trident, and WebKit (which is used by Google Chrome and Safari.

    Cost / License

    • Freemium (Pay once)
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Android
    • iPhone
    • Android Tablet
    • iPad
     
  9. Whale icon
     31 likes
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    Whale is web browser developed by Naver Corporation. Whale possess a lot of similar features as Vivaldi as being a customized pushed browser, multi-tasking browsing called 'Omnitasking', as much as other features as cloud saves & quick translation.

    Cost / License

    • Free
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Android Tablet
    • iPad
     
  10. Copy a direct link to this comment to your clipboard

    Firefox fork with compiler optimizations and patches from Librewolf, Waterfox, and GNU IceCat. It aims to be the Firefox equivalent of my main project: Thorium (a Chromium fork).

    62 Mercury Browser alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Windows
    • Linux
     
  11. Slimjet icon
     59 likes
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    Slimjet is a fast, smart and powerful web browser based on the Blink engine. It is built on top of the Chromium open source project, on which Google chrome is also based. Slimjet integrates a lot of powerful and convenient features to help users maximize their online...

    135 Slimjet alternatives

    Cost / License

    • Free
    • Proprietary

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
     
  12. UC Browser icon
     93 likes
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    Experience blazing fast browsing with video acceleration, secure your data from third parties, enjoy 20GB free cloud storage, ad-free browsing, data compression, multitasking with small window mode, and unique video player features for optimal playback.

    155 UC Browser alternatives

    Cost / License

    • Free
    • Proprietary

    Application type

    Alerts

    • Warning

    Platforms

    • Android
    • Android Tablet
     
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