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eM Client alternatives · Email

Open-source alternatives to eM Client

eM Client 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.

eM Client has a free plan. Paid plans start at $39.95 per year (Personal subscription, up to 3 devices). 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 eM Client

  1. Thunderbird

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

    • Thunderbird is free. eM Client starts at $39.95 per year (Personal subscription, up to 3 devices).
    • Only Thunderbird lists a Linux app.
    • Only eM Client lists an iOS app.
    • Thunderbird is open source, according to its own site.
    Thunderbird vs eM ClientThunderbird pricing and details

  2. Mailspring

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

    • Mailspring starts at $8 per month, or $85 per year (Mailspring Pro). eM Client starts at $39.95 per year (Personal subscription, up to 3 devices).
    • Only Mailspring lists a Linux app.
    • Only eM Client lists iOS and Android apps.
    • Mailspring is open source, according to its own site.
    Mailspring vs eM ClientMailspring pricing and details

  3. Wino Mail

    Free, open source mail and calendar app for Windows

    • Only eM Client lists macOS, iOS and Android apps.
    • Wino Mail is open source, according to its own site.
    • eM Client can be bought with a one-time purchase.
    • Wino Mail also covers templates.
    Wino Mail vs eM ClientWino Mail pricing and details

  4. Posteo

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

    • Posteo starts at €1 per month, prepaid (minimum top-up €12). eM Client starts at $39.95 per year (Personal subscription, up to 3 devices).
    • eM Client has a free plan. Posteo does not.
    • Only Posteo lists a web app.
    • Only eM Client lists Windows, macOS, iOS and Android apps.
    Posteo pricing and details

  5. 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. eM Client starts at $39.95 per year (Personal subscription, up to 3 devices).
    • Only Proton Mail lists a web app.
    • Only Proton Mail lists a Linux app.
    • Proton Mail is open source and end-to-end encrypted, according to its own site.
    Proton Mail 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). eM Client starts at $39.95 per year (Personal subscription, up to 3 devices).
    • Only Tuta Mail lists a web app.
    • Only Tuta Mail lists a Linux app.
    • Tuta Mail is open source and end-to-end encrypted, according to its own site.
    Tuta Mail pricing and details

  7. FairEmail

    Open source, privacy-oriented email client for Android

    • FairEmail starts at $7.49 one-time (pro features, US Google Play in-app purchase). eM Client starts at $39.95 per year (Personal subscription, up to 3 devices).
    • Only eM Client lists Windows, macOS and iOS apps.
    • FairEmail is open source and end-to-end encrypted, according to its own site.
    • eM Client also covers notes, tasks and calendar.
    FairEmail pricing and details

  8. Inbox Zero

    Open source AI email assistant for Gmail and Outlook

    • Inbox Zero starts at $18 per user / month, billed annually ($20 billed monthly). eM Client starts at $39.95 per year (Personal subscription, up to 3 devices).
    • eM Client has a free plan. Inbox Zero does not, though it has a free trial.
    • Only Inbox Zero lists a web app.
    • Only Inbox Zero lists a browser extension.
    Inbox Zero pricing and details

Common questions

Is there an open-source alternative to eM Client?

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

Is eM Client open source?

eM Client is not described as open source on its own site. The listing was checked on Oct 5, 2026 against the pages it cites.

Which of these email apps are free?

Thunderbird, Mailspring, Wino Mail, Proton Mail, 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 eM Client: the alternatives its listing names first, then the tools that share the most features with it.