# Fidelis Security vs RuleCheck: 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). [RuleCheck](https://cybersectools.com/tools/rulecheck) is a commercial [detection engineering](https://cybersectools.com/categories/detection-engineering) solution by [RuleCheck](https://cybersectools.com/companies/rulecheck). Features, integrations, deployment and the company behind each one, side by side.

## Side-by-side comparison

| | Fidelis Security | RuleCheck |
|---|---|---|
| Pricing model | Commercial | Commercial |
| Category | Extended Detection and Response | Detection Engineering |
| Verified | No | No |
| Deployment type | Hybrid | Hybrid |
| Company size fit | Mid-Market, Enterprise | Mid-Market, Enterprise |
| Company | Fidelis Security | RuleCheck |
| Headquarters | – | – |

### Use cases and capabilities

| | Fidelis Security | RuleCheck |
|---|---|---|
| Active Directory | Yes | – |
| MITRE ATT&CK | Yes | Yes |
| NDR | Yes | – |
| Detection Rules | – | Yes |
| Rule Management | – | Yes |
| Sigma | – | Yes |
| CI/CD | – | Yes |
| Continuous Testing | – | Yes |
| Rule Writing | – | Yes |
| Rule Generation | – | Yes |
| Rules | – | Yes |

### Core features

**Fidelis Security**

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

**RuleCheck**

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.

**RuleCheck**

4 integrations listed. Sign in on the page to see them.

## Fidelis Security vs RuleCheck FAQ

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

### What is the difference between Fidelis Security and RuleCheck?

**Fidelis Security**: XDR platform with NDR, EDR, deception, AD security, and CNAPP capabilities. Built by Fidelis Security.

**RuleCheck**: Automated QA tool for Elastic Security detection rules and queries. Built by RuleCheck.

The table above shows where their features, integrations, deployment and company size fit differ.

### Who makes Fidelis Security and RuleCheck?

**Fidelis Security** is made by Fidelis Security. **RuleCheck** is made by RuleCheck. 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 RuleCheck?

In part. Fidelis Security and RuleCheck are not in the same category on CybersecTools. 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)
- [RuleCheck vs Red Piranha Crystal Eye XDR](https://cybersectools.com/compare/red-piranha-crystal-eye-xdr-vs-rulecheck)
- [RuleCheck vs Palo Alto Networks Cortex XSIAM](https://cybersectools.com/compare/palo-alto-networks-cortex-xsiam-vs-rulecheck)
- [RuleCheck vs ThreatDefence SecOps Platform](https://cybersectools.com/compare/rulecheck-vs-threatdefence-secops-platform)

## Alternatives to each

- [See all Fidelis Security alternatives](https://cybersectools.com/alternatives/fidelis-security)
- [See all RuleCheck alternatives](https://cybersectools.com/alternatives/rulecheck)

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

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 RuleCheck: 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