# Corelight Zeek vs GREYCORTEX Mendel: side-by-side comparison (2026)

[Corelight Zeek](https://cybersectools.com/tools/corelight-zeek) is a free [network detection and response](https://cybersectools.com/categories/ndr) solution by [Corelight](https://cybersectools.com/companies/corelight). [GREYCORTEX Mendel](https://cybersectools.com/tools/greycortex-mendel) is a commercial [network detection and response](https://cybersectools.com/categories/ndr) solution by [GREYCORTEX](https://cybersectools.com/companies/greycortex). Features, integrations, deployment and the company behind each one, side by side.

## Side-by-side comparison

| | Corelight Zeek | GREYCORTEX Mendel |
|---|---|---|
| Pricing model | Free | Commercial |
| Category | Network Detection and Response | Network Detection and Response |
| Verified | No | No |
| Deployment type | Hybrid | Hybrid |
| Company size fit | SMB, Mid-Market, Enterprise | SMB, Mid-Market, Enterprise |
| Company | Corelight | GREYCORTEX |
| Headquarters | – | – |

### Use cases and capabilities

| | Corelight Zeek | GREYCORTEX Mendel |
|---|---|---|
| Open Source | Yes | – |
| Zeek | Yes | – |
| Network Monitoring | Yes | Yes |
| NDR | – | Yes |
| Anomaly Detection | – | Yes |
| IoT Security | – | Yes |
| SCADA | – | Yes |
| Flow Analysis | – | Yes |
| PCAP | – | Yes |
| Network Visibility | – | Yes |
| Critical Infrastructure | – | Yes |
| Threat Analysis | – | Yes |

### Core features

**Corelight Zeek**

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

**GREYCORTEX Mendel**

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

### Integrations

**Corelight Zeek**

1 integration listed. Sign in on the page to see them.

**GREYCORTEX Mendel**

No integrations listed.

## Which one fits you

Based on what each listing shows: deployment, company size, price and open source.

- [Corelight Zeek](https://cybersectools.com/tools/corelight-zeek) fits if you need a free product.

## Corelight Zeek vs GREYCORTEX Mendel FAQ

Common questions when comparing Corelight Zeek vs GREYCORTEX Mendel for network detection and response.

### What is the difference between Corelight Zeek and GREYCORTEX Mendel?

**Corelight Zeek**: Open source network security monitoring tool for traffic analysis. Built by Corelight.

**GREYCORTEX Mendel**: Network detection and response platform for IT, IoT, and OT threat monitoring. Built by GREYCORTEX.

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

### Who makes Corelight Zeek and GREYCORTEX Mendel?

**Corelight Zeek** is made by Corelight. **GREYCORTEX Mendel** is made by GREYCORTEX. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is Corelight Zeek a good alternative to GREYCORTEX Mendel?

Often, yes. Corelight Zeek and GREYCORTEX Mendel are both Network Detection and Response products, and both cover Network Monitoring. Key differences: Corelight Zeek is Free while GREYCORTEX Mendel is Commercial. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [Corelight Zeek vs Port0 Network Security](https://cybersectools.com/compare/corelight-zeek-vs-port0-network-security)
- [Corelight Zeek vs Hypergraph AI](https://cybersectools.com/compare/corelight-zeek-vs-hypergraph-ai)
- [Corelight Zeek vs Hyprfire Firebug](https://cybersectools.com/compare/corelight-zeek-vs-hyprfire-firebug)
- [GREYCORTEX Mendel vs Port0 Network Security](https://cybersectools.com/compare/greycortex-mendel-vs-port0-network-security)
- [GREYCORTEX Mendel vs Hypergraph AI](https://cybersectools.com/compare/greycortex-mendel-vs-hypergraph-ai)
- [GREYCORTEX Mendel vs Hyprfire Firebug](https://cybersectools.com/compare/greycortex-mendel-vs-hyprfire-firebug)

## Alternatives to each

- [See all Corelight Zeek alternatives](https://cybersectools.com/alternatives/corelight-zeek)
- [See all GREYCORTEX Mendel alternatives](https://cybersectools.com/alternatives/greycortex-mendel)

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Source: https://cybersectools.com/compare/corelight-zeek-vs-greycortex-mendel

For AI agents: each product above has its own Markdown page (add .md to its URL, for example https://cybersectools.com/tools/corelight-zeek.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md.

More on Corelight Zeek and GREYCORTEX Mendel: 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