Microsoft Defender XDR is a commercial extended detection and response solution by Microsoft. ReliaQuest GreyMatter is a commercial extended detection and response solution by ReliaQuest. Features, integrations, deployment and the company behind each one, side by side.
XDR solution for unified detection and response across Microsoft 365
Agentic AI security operations platform for autonomous threat investigation
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Common questions when comparing Microsoft Defender XDR vs ReliaQuest GreyMatter for extended detection and response.
Microsoft Defender XDR: XDR solution for unified detection and response across Microsoft 365. Built by Microsoft.
ReliaQuest GreyMatter: Agentic AI security operations platform for autonomous threat investigation. Built by ReliaQuest.
The table above shows where their features, integrations, deployment and company size fit differ.
Microsoft Defender XDR is made by Microsoft. ReliaQuest GreyMatter is made by ReliaQuest. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.
Often, yes. Microsoft Defender XDR and ReliaQuest GreyMatter are both Extended Detection and Response products. Use the table above to see where features, deployment and company size fit differ.
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Updated 2026-11-02
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