Skip to content
ToolGPA

HEY alternatives · Email

Open-source alternatives to HEY

HEY 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.

HEY is a paid product with a free trial, starting at $99 per year (HEY for You, annual billing only). 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 HEY

  1. 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. HEY starts at $99 per year (HEY for You, annual billing only).
    • Proton Mail has a free plan. HEY does not, though it has a free trial.
    • Proton Mail is open source and end-to-end encrypted, according to its own site.
    • HEY also covers templates.
    Proton Mail vs HEYProton Mail pricing and details

  2. Wino Mail

    Free, open source mail and calendar app for Windows

    • Wino Mail has a free plan. HEY does not, though it has a free trial.
    • Only HEY lists a web app.
    • Only HEY lists macOS, Linux, iOS and Android apps.
    • Wino Mail is open source, according to its own site.
    Wino Mail pricing and details

  3. Thunderbird

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

    • Thunderbird is free. HEY starts at $99 per year (HEY for You, annual billing only).
    • Thunderbird has a free plan. HEY does not, though it has a free trial.
    • Only HEY lists a web app.
    • Only HEY lists an iOS app.
    Thunderbird pricing and details

  4. Tuta Mail

    End-to-end encrypted email and calendar from Germany

    • Tuta Mail starts at €3 per month, paid yearly (lowest paid personal plan). HEY starts at $99 per year (HEY for You, annual billing only).
    • Tuta Mail has a free plan. HEY does not, though it has a free trial.
    • Tuta Mail is open source and end-to-end encrypted, according to its own site.
    • HEY also covers templates.
    Tuta Mail pricing and details

  5. Mailspring

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

    • Mailspring starts at $8 per month, or $85 per year (Mailspring Pro). HEY starts at $99 per year (HEY for You, annual billing only).
    • Mailspring has a free plan. HEY does not, though it has a free trial.
    • Only HEY lists a web app.
    • Only HEY lists iOS and Android apps.
    Mailspring 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). HEY starts at $99 per year (HEY for You, annual billing only).
    • Only HEY lists macOS, Windows, Linux, iOS and Android apps.
    • Posteo is open source and end-to-end encrypted, according to its own site.
    • Posteo also covers notes.
    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). HEY starts at $99 per year (HEY for You, annual billing only).
    • FairEmail has a free plan. HEY does not, though it has a free trial.
    • Only HEY lists a web app.
    • Only HEY lists macOS, Windows, Linux and iOS apps.
    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). HEY starts at $99 per year (HEY for You, annual billing only).
    • Only Inbox Zero lists a browser extension.
    • Only HEY lists a Linux app.
    • Inbox Zero is open source and self-hostable, according to its own site.
    Inbox Zero pricing and details

Common questions

Is there an open-source alternative to HEY?

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

Is HEY open source?

HEY 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?

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