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Roundcube alternatives · Email

Roundcube alternatives with a Windows app

The Roundcube listing does not include a Windows app. 39 of the 125 other email apps in this directory list a Windows app.

Roundcube is free to use. 25 of them are free or have a free plan.

39 tools · Listings checked up to Nov 13, 2026 · Where the facts come from

The 12 closest to Roundcube

  1. Zimbra

    Self-hosted email, calendar and file sharing for organizations

    • Roundcube has a free plan. Zimbra does not.
    • Only Zimbra lists Windows, macOS, Linux, iOS and Android apps.
    • Zimbra also covers tasks and calendar.
    Zimbra vs RoundcubeZimbra pricing and details

  2. Thunderbird

    Free, open-source email app for Windows, macOS, Linux and Android

    • Thunderbird is free. Roundcube is free.
    • Only Thunderbird lists Windows, macOS, Linux and Android apps.
    • Only Roundcube lists a web app.
    • Roundcube is self-hostable, according to its own site.
    Thunderbird vs RoundcubeThunderbird pricing and details

  3. Mailspring

    Open-source desktop email client for Mac, Windows and Linux

    • Mailspring starts at $8 per month, or $85 per year (Mailspring Pro). Roundcube is free.
    • Only Mailspring lists macOS, Windows and Linux apps.
    • Only Roundcube lists a web app.
    • Roundcube is self-hostable, according to its own site.
    Mailspring vs RoundcubeMailspring pricing and details

  4. Fastmail

    Paid, ad-free email with calendar, contacts and custom domains

    • Fastmail starts at $3 per user / month, billed yearly (Basic); Individual is $5, billed yearly. Roundcube is free.
    • Roundcube has a free plan. Fastmail does not, though it has a free trial.
    • Only Fastmail lists Windows, macOS, Linux, iOS and Android apps.
    • Roundcube is open source and self-hostable, according to its own site.
    Fastmail vs RoundcubeFastmail pricing and details

  5. Inbox Zero

    Open source AI email assistant for Gmail and Outlook

    • Inbox Zero starts at $18 per user / month, billed annually ($20 billed monthly). Roundcube is free.
    • Roundcube has a free plan. Inbox Zero does not, though it has a free trial.
    • Only Inbox Zero lists macOS, Windows, iOS and Android apps.
    • Only Inbox Zero lists a browser extension.
    Inbox Zero pricing and details

  6. Proton Mail

    End-to-end encrypted email service based in Switzerland

    • Proton Mail starts at $3.99 per month, billed every 12 months ($47.88); $4.99 billed monthly. Roundcube is free.
    • Only Proton Mail lists macOS, Windows, Linux, iOS and Android apps.
    • Proton Mail is end-to-end encrypted, according to its own site.
    • Roundcube is self-hostable, according to its own site.
    Proton Mail pricing and details

  7. Tuta Mail

    End-to-end encrypted email and calendar from Germany

    • Tuta Mail starts at €3 per month, paid yearly (lowest paid personal plan). Roundcube is free.
    • Only Tuta Mail lists Windows, macOS, Linux, iOS and Android apps.
    • Tuta Mail is end-to-end encrypted, according to its own site.
    • Roundcube is self-hostable, according to its own site.
    Tuta Mail pricing and details

  8. Wino Mail

    Free, open source mail and calendar app for Windows

    • Only Wino Mail lists a Windows app.
    • Only Roundcube lists a web app.
    • Roundcube is self-hostable, according to its own site.
    • Wino Mail also covers templates, tasks and calendar.
    Wino Mail pricing and details

  9. Claws Mail

    Lightweight GTK email and news client, free under the GPL

    • Claws Mail is free. Roundcube is free.
    • Only Claws Mail lists Linux and Windows apps.
    • Only Roundcube lists a web app.
    • Roundcube is self-hostable, according to its own site.
    Claws Mail pricing and details

  10. Betterbird

    A fork of Thunderbird with extra features and bug fixes

    • Betterbird is free. Roundcube is free.
    • Only Betterbird lists Windows, macOS and Linux apps.
    • Only Roundcube lists a web app.
    • Roundcube is self-hostable, according to its own site.
    Betterbird pricing and details

  11. Sylpheed

    Lightweight desktop email client built on GTK+

    • Sylpheed is free. Roundcube is free.
    • Only Sylpheed lists Windows, macOS and Linux apps.
    • Only Roundcube lists a web app.
    • Roundcube is self-hostable, according to its own site.
    Sylpheed pricing and details

  12. Axigen

    Mail server with calendars and webmail for Windows and Linux

    • Only Axigen lists Windows and Linux apps.
    • Roundcube is open source, according to its own site.
    • Axigen also covers calendar.
    Axigen pricing and details

27 more that list a Windows app

All 39 in one table

Common questions

Which Roundcube alternatives have a Windows app?

Zimbra, Thunderbird, Mailspring, Fastmail, Inbox Zero, Proton Mail, Tuta Mail, Wino Mail and 31 more list a Windows app.

Does Roundcube have a Windows app?

The Roundcube listing does not include a Windows app. It lists Web.

Which of these email apps are free?

Thunderbird, Mailspring, Proton Mail, Tuta Mail, Wino Mail, Claws Mail, Betterbird, Sylpheed and 17 more are free or have a free plan.

When was this checked?

Each listing shows its own date. On this page they run from Oct 4, 2026 to Nov 13, 2026. Vendors change prices and plans without notice, so confirm on their site before you buy.

This page is built from the listings. A tool is here because its listing says so, and the order is how close each is to Roundcube: the alternatives its listing names first, then the tools that share the most features with it.