# Fidelis Security vs ReliaQuest GreyMatter: 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). [ReliaQuest GreyMatter](https://cybersectools.com/tools/reliaquest-greymatter) is a commercial [extended detection and response](https://cybersectools.com/categories/xdr) solution by [ReliaQuest](https://cybersectools.com/companies/reliaquest). Features, integrations, deployment and the company behind each one, side by side.

## Side-by-side comparison

| | Fidelis Security | ReliaQuest GreyMatter |
|---|---|---|
| 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 | ReliaQuest |
| Headquarters | – | – |

### Use cases and capabilities

| | Fidelis Security | ReliaQuest GreyMatter |
|---|---|---|
| Active Directory | Yes | – |
| MITRE ATT&CK | Yes | – |
| NDR | Yes | – |
| Security Orchestration | – | Yes |

### Core features

**Fidelis Security**

10 features listed. Sign in on the page to see them.

**ReliaQuest GreyMatter**

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.

**ReliaQuest GreyMatter**

34 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.
- [ReliaQuest GreyMatter](https://cybersectools.com/tools/reliaquest-greymatter) fits if you want a cloud product and you are a small business.

## Fidelis Security vs ReliaQuest GreyMatter FAQ

Common questions when comparing Fidelis Security vs ReliaQuest GreyMatter for extended detection and response.

### What is the difference between Fidelis Security and ReliaQuest GreyMatter?

**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.

### Who makes Fidelis Security and ReliaQuest GreyMatter?

**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.

### Is Fidelis Security a good alternative to ReliaQuest GreyMatter?

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.

## Related comparisons

- [Fidelis Security vs ThreatDefence SecOps Platform](https://cybersectools.com/compare/fidelis-security-vs-threatdefence-secops-platform)
- [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)
- [ReliaQuest GreyMatter vs ThreatDefence SecOps Platform](https://cybersectools.com/compare/reliaquest-greymatter-vs-threatdefence-secops-platform)
- [ReliaQuest GreyMatter vs Red Piranha Crystal Eye XDR](https://cybersectools.com/compare/red-piranha-crystal-eye-xdr-vs-reliaquest-greymatter)
- [ReliaQuest GreyMatter vs Palo Alto Networks Cortex XSIAM](https://cybersectools.com/compare/palo-alto-networks-cortex-xsiam-vs-reliaquest-greymatter)

## Alternatives to each

- [See all Fidelis Security alternatives](https://cybersectools.com/alternatives/fidelis-security)
- [See all ReliaQuest GreyMatter alternatives](https://cybersectools.com/alternatives/reliaquest-greymatter)

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Source: https://cybersectools.com/compare/fidelis-security-vs-reliaquest-greymatter

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 ReliaQuest GreyMatter: 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