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    © 2026 builtbyindies, Inc.

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    Aster Mail

    End-to-end encrypted email with post-quantum cryptography.

    Aster Mail

    Aster Mail

    End-to-end encrypted email with post-quantum cryptography.

    A
    Aster Privacy

    Screenshots

    Screenshot 1
    Screenshot 2
    Screenshot 3
    Screenshot 4
    Open Source
    Freemium
    Email
    Privacy
    Open Source
    Built with
    RustRust
    TypescriptTypescript
    P
    Privacy

    We built Aster because encrypted email shouldn't require a technical degree or a compromise on features. Your inbox should be private by default , not as an add-on.

    All encryption happens on your device before anything touches our servers. We cannot read your emails, and neither can anyone else. On top of standard PGP, Aster uses post-quantum cryptography by default, meaning your emails are protected even against future quantum attacks, and it works when emailing Gmail users too, not just other Aster users.

    Features

    • End-to-end encryption – Email content, contacts, search, and attachments all encrypted client-side
    • Post-quantum cryptography – ML-KEM-768 + X3DH + Double Ratchet, protecting against store-now-decrypt-later attacks
    • Free aliases & ghost aliases – Auto-generated anonymous addresses included on every plan
    • Custom domains – Bring your own domain, included free
    • Burn-after-read, scheduled send, email snooze – Features you'd expect from a modern inbox
    • Fully open source – AGPL v3, codebase public on GitHub at launch
    • Cross-platform – Web, iOS, Android, macOS, and Windows
    • Servers in Germany – Hosted on Hetzner

    We don't read your emails. We don't sell your data. That's the whole point.

    VBM
    Vyshnav TR & 3 others upvoted
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