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Tessian Defender Reviews

Vendor: TESSIAN
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    What is Tessian Defender?

    Automatically prevent spear phishing, business email compromise, and other targeted email attacks.
    Get the Email Security Buyer's Guide and find out what your peers are saying about Tessian Defender, Microsoft Defender for Office 365, Darktrace and more!
    Buyer's Guide
    Email Security
    August 2025
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    Helped 867,370 peers since 2012

    Tessian Defender mindshare

    As of September 2025, the mindshare of Tessian Defender in the Email Security category stands at 0.2%, up from 0.2% compared to the previous year, according to calculations based on PeerSpot user engagement data.
    Email Security Market Share Distribution
    ProductMarket Share (%)
    Tessian Defender0.2%
    Microsoft Defender for Office 36511.5%
    Proofpoint Email Protection8.2%
    Other80.1%
    Email Security

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    Tessian Defender customers

    Affirm, Choate, BMA, Evercore, Gubra, Accel, Fieldfisher, Clearwater, Man Group plc, Graphcore, Investec, Rightmove

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    Product Categories

    Product Categories
    Email Security

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