Fidelis Security is a commercial extended detection and response solution by Fidelis Security. 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 platform with NDR, EDR, deception, AD security, and CNAPP capabilities
Agentic AI security operations platform for autonomous threat investigation
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Based on what each listing shows: deployment, company size, price and open source.
Fidelis Security fits if you need both cloud and on-premises options.
ReliaQuest GreyMatter fits if you want a cloud product and you are a small business.
Common questions when comparing Fidelis Security vs ReliaQuest GreyMatter for extended detection and response.
Fidelis Security: XDR platform with NDR, EDR, deception, AD security, and CNAPP capabilities. Built by Fidelis Security.
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.
Fidelis Security is made by Fidelis Security. 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. Fidelis Security and ReliaQuest GreyMatter are both Extended Detection and Response products. Use the table above to see where features, deployment and company size fit differ.
No Extended Detection and Response shortlist yet. This is the closest one.
Updated 2026-11-02
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