Fidelis Security vs Microsoft Defender XDR: Side-by-Side Comparison (2026)

Fidelis Security: XDR platform with NDR, EDR, deception, AD security, and CNAPP capabilities. built by Fidelis Security. Core capabilities include Forensic and metadata collection from 300+ attributes, Threat detection with MITRE ATT&CK mappings, Deep Session Inspection technology..

Microsoft Defender XDR: XDR solution for unified detection and response across Microsoft 365. built by Microsoft. Core capabilities include Automatic attack disruption, Incident-level correlation and prioritization, Automated investigation and response..

Both serve the Extended Detection and Response market but differ in approach, feature depth, and target audience.

Fidelis Security differentiates with Forensic and metadata collection from 300+ attributes, Threat detection with MITRE ATT&CK mappings, Deep Session Inspection technology. Microsoft Defender XDR differentiates with Automatic attack disruption, Incident-level correlation and prioritization, Automated investigation and response.

Fidelis Security is developed by Fidelis Security. Microsoft Defender XDR is developed by Microsoft. Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

Fidelis Security integrates with Forescout, Devo, AWS, Microsoft Azure, SentinelOne. Microsoft Defender XDR integrates with Microsoft Security Copilot, Microsoft Sentinel, Microsoft 365. Check integration compatibility with your existing security stack before deciding.

Fidelis Security and Microsoft Defender XDR serve similar Extended Detection and Response use cases: both are Extended Detection and Response tools, both cover MITRE Attack. Review the feature comparison above to determine which fits your requirements.