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Gmelius alternatives · Email

Open-source alternatives to Gmelius

Gmelius is not described as open source on its own site. 8 of the 51 other email apps in this directory are open source, according to their own sites.

Gmelius is a paid product with a free trial, starting at $19 per user / month, billed yearly. 6 of them are free or have a free plan.

8 tools · Listings checked up to Oct 9, 2026 · Where the facts come from

How each one differs from Gmelius

  1. Mailspring

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

    • Mailspring starts at $8 per month, or $85 per year (Mailspring Pro). Gmelius starts at $19 per user / month, billed yearly.
    • Mailspring has a free plan. Gmelius does not, though it has a free trial.
    • Only Mailspring lists macOS, Windows and Linux apps.
    • Only Gmelius lists a web app.
    Mailspring pricing and details

  2. Inbox Zero

    Open source AI email assistant for Gmail and Outlook

    • Inbox Zero starts at $18 per user / month, billed annually ($20 billed monthly). Gmelius starts at $19 per user / month, billed yearly.
    • Only Inbox Zero lists macOS, Windows, iOS and Android apps.
    • Inbox Zero is open source and self-hostable, according to its own site.
    • Inbox Zero also covers chat assistant, email client and inbox filtering.
    Inbox Zero pricing and details

  3. Wino Mail

    Free, open source mail and calendar app for Windows

    • Wino Mail has a free plan. Gmelius does not, though it has a free trial.
    • Only Wino Mail lists a Windows app.
    • Only Gmelius lists a web app.
    • Only Gmelius lists a browser extension.
    Wino Mail pricing and details

  4. 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. Gmelius starts at $19 per user / month, billed yearly.
    • Proton Mail has a free plan. Gmelius does not, though it has a free trial.
    • Only Proton Mail lists macOS, Windows, Linux, iOS and Android apps.
    • Only Gmelius lists a browser extension.
    Proton Mail pricing and details

  5. Thunderbird

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

    • Thunderbird is free. Gmelius starts at $19 per user / month, billed yearly.
    • Thunderbird has a free plan. Gmelius does not, though it has a free trial.
    • Only Thunderbird lists Windows, macOS, Linux and Android apps.
    • Only Gmelius lists a web app.
    Thunderbird pricing and details

  6. Tuta Mail

    End-to-end encrypted email and calendar from Germany

    • Tuta Mail starts at €3 per month, paid yearly (lowest paid personal plan). Gmelius starts at $19 per user / month, billed yearly.
    • Tuta Mail has a free plan. Gmelius does not, though it has a free trial.
    • Only Tuta Mail lists Windows, macOS, Linux, iOS and Android apps.
    • Only Gmelius lists a browser extension.
    Tuta Mail pricing and details

  7. Posteo

    Ad-free, green-powered email from Berlin for €1 a month

    • Posteo starts at €1 per month, prepaid (minimum top-up €12). Gmelius starts at $19 per user / month, billed yearly.
    • Only Gmelius lists a browser extension.
    • Posteo is open source and end-to-end encrypted, according to its own site.
    • Posteo also covers notes, calendar and email client.
    Posteo pricing and details

  8. FairEmail

    Open source, privacy-oriented email client for Android

    • FairEmail starts at $7.49 one-time (pro features, US Google Play in-app purchase). Gmelius starts at $19 per user / month, billed yearly.
    • FairEmail has a free plan. Gmelius does not, though it has a free trial.
    • Only FairEmail lists an Android app.
    • Only Gmelius lists a web app.
    FairEmail pricing and details

Common questions

Is there an open-source alternative to Gmelius?

Yes. Mailspring, Inbox Zero, Wino Mail, Proton Mail, Thunderbird, Tuta Mail, Posteo and FairEmail are open source, according to their own sites.

Is Gmelius open source?

Gmelius is not described as open source on its own site. The listing was checked on Oct 6, 2026 against the pages it cites.

Which of these email apps are free?

Mailspring, Wino Mail, Proton Mail, Thunderbird, Tuta Mail and FairEmail 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 Oct 9, 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 Gmelius: the alternatives its listing names first, then the tools that share the most features with it.