Skip to content
ToolGPA

Superhuman Mail alternatives · Email

Open-source alternatives to Superhuman Mail

Superhuman Mail 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.

Superhuman Mail is a paid product, starting at $25 per member / month, billed annually ($30 billed monthly). 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 Superhuman Mail

  1. Inbox Zero

    Open source AI email assistant for Gmail and Outlook

    • Inbox Zero starts at $18 per user / month, billed annually ($20 billed monthly). Superhuman Mail starts at $25 per member / month, billed annually ($30 billed monthly).
    • Inbox Zero is open source and self-hostable, according to its own site.
    • Inbox Zero also covers chat assistant, inbox filtering and workflow automation.
    • Superhuman Mail also covers calendar and booking links.
    Inbox Zero vs Superhuman MailInbox Zero pricing and details

  2. Wino Mail

    Free, open source mail and calendar app for Windows

    • Wino Mail has a free plan. Superhuman Mail does not.
    • Only Superhuman Mail lists a web app.
    • Only Superhuman Mail lists macOS, iOS and Android apps.
    • Only Superhuman Mail lists a browser extension.
    Wino Mail pricing and details

  3. Tuta Mail

    End-to-end encrypted email and calendar from Germany

    • Tuta Mail starts at €3 per month, paid yearly (lowest paid personal plan). Superhuman Mail starts at $25 per member / month, billed annually ($30 billed monthly).
    • Tuta Mail has a free plan. Superhuman Mail does not.
    • Only Tuta Mail lists a Linux app.
    • Only Superhuman Mail lists a browser extension.
    Tuta 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. Superhuman Mail starts at $25 per member / month, billed annually ($30 billed monthly).
    • Proton Mail has a free plan. Superhuman Mail does not.
    • Only Proton Mail lists a Linux app.
    • Only Superhuman Mail 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. Superhuman Mail starts at $25 per member / month, billed annually ($30 billed monthly).
    • Thunderbird has a free plan. Superhuman Mail does not.
    • Only Thunderbird lists a Linux app.
    • Only Superhuman Mail lists a web app.
    Thunderbird pricing and details

  6. Posteo

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

    • Posteo starts at €1 per month, prepaid (minimum top-up €12). Superhuman Mail starts at $25 per member / month, billed annually ($30 billed monthly).
    • Only Superhuman Mail lists macOS, Windows, iOS and Android apps.
    • Only Superhuman Mail lists a browser extension.
    • Posteo is open source and end-to-end encrypted, according to its own site.
    Posteo 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). Superhuman Mail starts at $25 per member / month, billed annually ($30 billed monthly).
    • FairEmail has a free plan. Superhuman Mail does not.
    • Only Superhuman Mail lists a web app.
    • Only Superhuman Mail lists macOS, Windows and iOS apps.
    FairEmail pricing and details

  8. Mailspring

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

    • Mailspring starts at $8 per month, or $85 per year (Mailspring Pro). Superhuman Mail starts at $25 per member / month, billed annually ($30 billed monthly).
    • Mailspring has a free plan. Superhuman Mail does not.
    • Only Mailspring lists a Linux app.
    • Only Superhuman Mail lists a web app.
    Mailspring pricing and details

Common questions

Is there an open-source alternative to Superhuman Mail?

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

Is Superhuman Mail open source?

Superhuman Mail is not described as open source on its own site. The listing was checked on Oct 4, 2026 against the pages it cites.

Which of these email apps are free?

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