Fidelis Security is a commercial extended detection and response solution by Fidelis Security. Microsoft Defender XDR is a commercial extended detection and response solution by Microsoft. Features, integrations, deployment and the company behind each one, side by side.
XDR platform with NDR, EDR, deception, AD security, and CNAPP capabilities
XDR solution for unified detection and response across Microsoft 365
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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.
Microsoft Defender XDR fits if you want a cloud product and you are a small business.
Common questions when comparing Fidelis Security vs Microsoft Defender XDR for extended detection and response.
Fidelis Security: XDR platform with NDR, EDR, deception, AD security, and CNAPP capabilities, built by Fidelis Security.
Microsoft Defender XDR: XDR solution for unified detection and response across Microsoft 365, built by Microsoft.
The table above shows where their features, integrations, deployment and company size fit differ.
Fidelis Security is made by Fidelis Security. Microsoft Defender XDR is made by Microsoft. 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 Microsoft Defender XDR are both Extended Detection and Response products, and both cover MITRE ATT&CK. 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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