# Fidelis Security vs Microsoft Defender XDR: side-by-side comparison (2026) [Fidelis Security](https://cybersectools.com/tools/fidelis-security) is a commercial [extended detection and response](https://cybersectools.com/categories/xdr) solution by [Fidelis Security](https://cybersectools.com/companies/fidelis-security). [Microsoft Defender XDR](https://cybersectools.com/tools/microsoft-defender-xdr) is a commercial [extended detection and response](https://cybersectools.com/categories/xdr) solution by [Microsoft](https://cybersectools.com/companies/microsoft). Features, integrations, deployment and the company behind each one, side by side. ## Side-by-side comparison | | Fidelis Security | Microsoft Defender XDR | |---|---|---| | Pricing model | Commercial | Commercial | | Category | Extended Detection and Response | Extended Detection and Response | | Verified | No | No | | Deployment type | Hybrid | Cloud | | Company size fit | Mid-Market, Enterprise | SMB, Mid-Market, Enterprise | | Company | Fidelis Security | Microsoft | | Headquarters | – | – | ### Use cases and capabilities | | Fidelis Security | Microsoft Defender XDR | |---|---|---| | Active Directory | Yes | – | | MITRE ATT&CK | Yes | Yes | | NDR | Yes | – | ### Core features **Fidelis Security** 10 features listed. Sign in on the page to see them. **Microsoft Defender XDR** 10 features listed. Sign in on the page to see them. ### Integrations **Fidelis Security** 5 integrations listed. Sign in on the page to see them. **Microsoft Defender XDR** 3 integrations listed. Sign in on the page to see them. ## Which one fits you Based on what each listing shows: deployment, company size, price and open source. - [Fidelis Security](https://cybersectools.com/tools/fidelis-security) fits if you need both cloud and on-premises options. - [Microsoft Defender XDR](https://cybersectools.com/tools/microsoft-defender-xdr) fits if you want a cloud product and you are a small business. ## Fidelis Security vs Microsoft Defender XDR FAQ Common questions when comparing Fidelis Security vs Microsoft Defender XDR for extended detection and response. ### What is the difference between Fidelis Security and Microsoft Defender XDR? **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. ### Who makes Fidelis Security and Microsoft Defender XDR? **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. ### Is Fidelis Security a good alternative to Microsoft Defender XDR? 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. ## Related comparisons - [Fidelis Security vs Red Piranha Crystal Eye XDR](https://cybersectools.com/compare/fidelis-security-vs-red-piranha-crystal-eye-xdr) - [Fidelis Security vs Palo Alto Networks Cortex XSIAM](https://cybersectools.com/compare/fidelis-security-vs-palo-alto-networks-cortex-xsiam) - [Fidelis Security vs ThreatDefence SecOps Platform](https://cybersectools.com/compare/fidelis-security-vs-threatdefence-secops-platform) - [Microsoft Defender XDR vs Red Piranha Crystal Eye XDR](https://cybersectools.com/compare/microsoft-defender-xdr-vs-red-piranha-crystal-eye-xdr) - [Microsoft Defender XDR vs Palo Alto Networks Cortex XSIAM](https://cybersectools.com/compare/microsoft-defender-xdr-vs-palo-alto-networks-cortex-xsiam) - [Microsoft Defender XDR vs ThreatDefence SecOps Platform](https://cybersectools.com/compare/microsoft-defender-xdr-vs-threatdefence-secops-platform) ## Alternatives to each - [See all Fidelis Security alternatives](https://cybersectools.com/alternatives/fidelis-security) - [See all Microsoft Defender XDR alternatives](https://cybersectools.com/alternatives/microsoft-defender-xdr) --- Source: https://cybersectools.com/compare/fidelis-security-vs-microsoft-defender-xdr For AI agents: each product above has its own Markdown page (add .md to its URL, for example https://cybersectools.com/tools/fidelis-security.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md. More on Fidelis Security and Microsoft Defender XDR: funding, momentum, hiring and news, plus the full product and company record, are available through the Mandos MCP Server (paid plans), which connects to AI assistants: https://mandos.io/mcp?utm_source=cybersectools.com&utm_medium=compare-md