SeaMonkey AlternativesOnly apps categorised as Contact Managers

The best Contact Manager alternative to SeaMonkey is Thunderbird, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to SeaMonkey and four of them are Contact Managers so hopefully you can find a suitable replacement. Other interesting Contact Manager alternatives to SeaMonkey are Flectar Mail, Hylki and Clyton.

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SeaMonkey alternatives are mainly Contact Managers, but if you're looking for Email Clients or Calendar Apps you can filter on that. Other popular filters include Android. These are just examples - use the filter bar below to find more specific alternatives to SeaMonkey.
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Alternatives
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Alternatives list

  1. Thunderbird icon

    Thunderbird

     2625 likes

    Cross-platform email client supporting multiple identities, chat, and strong filtering. Extend functionality with add-ons like RSS/Atom feed readers and PGP support.

    99 Thunderbird alternatives

    Cost / License

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • BSD
    • AppImageHub
    • Snapcraft
    • Flathub
    • PortableApps.com
    • F-Droid
    • Haiku
    • Homebrew
    • Chocolatey
    • OpenAPK
    • US flagUnited States
    Thunderbird screenshot 1
    Good alternative?
     
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    3
  2. Flectar Mail icon

    Flectar Mail

     3 likes

    Built from the ground up for speed. Flectar Mail delivers native performance, instant startup, and as little as 20 MB of RAM.

    Cost / License

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • ES flagSpain
    • European Union flagEU
    Flectar Mail screenshot 1
    Good alternative?
     
  4. Hylki icon

    Hylki

     Like

    Hylki is a fast, GNOME-native email client with a three-pane layout, unified inbox, and support for OAuth accounts. Fast to open, effortless to read, and private by default.

    Cost / License

    Application type

    Platforms

    • Linux
    • Flatpak
    • US flagUnited States
    Hylki screenshot 1
    Good alternative?
     
  5. Clyton icon

    Clyton

     1 like

    Clyton is an email client with advanced security and spam filtering features. Although priced for the general public, Clyton possesses the reliability and security required by businesses.

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Windows
    • US flagUnited States
    Clyton screenshot 1
    Good alternative?
     
4 of 4 SeaMonkey alternatives