# Fluency SIEM vs Security Onion Pro: side-by-side comparison (2026)

[Fluency SIEM](https://cybersectools.com/tools/fluency-siem) is a commercial [security information and event management](https://cybersectools.com/categories/security-information-and-event-management-siem) solution by [Fluency Security](https://cybersectools.com/companies/fluency-security). [Security Onion Pro](https://cybersectools.com/tools/security-onion-pro) is a commercial [security information and event management](https://cybersectools.com/categories/security-information-and-event-management-siem) solution by [Security Onion Solutions](https://cybersectools.com/companies/security-onion-solutions). Features, integrations, deployment and the company behind each one, side by side.

Need the answer fast? [Best SIEM Solutions for Business](https://cybersectools.com/shortlists/best-siem-solutions) picks Microsoft Sentinel, Splunk Enterprise Security, CrowdStrike Falcon Next-Gen SIEM and 4 more.

## Side-by-side comparison

| | Fluency SIEM | Security Onion Pro |
|---|---|---|
| Pricing model | Commercial | Commercial |
| Category | Security Information and Event Management | Security Information and Event Management |
| Verified | No | No |
| Deployment type | Cloud | On-Premises |
| Company size fit | Mid-Market, Enterprise | Mid-Market, Enterprise |
| Company | Fluency Security | Security Onion Solutions |
| Headquarters | – | – |

### Use cases and capabilities

| | Fluency SIEM | Security Onion Pro |
|---|---|---|
| NDR | – | Yes |
| SSO | – | Yes |
| Encryption | – | Yes |
| MITRE ATT&CK | – | Yes |
| YARA | – | Yes |
| Sigma | – | Yes |
| Suricata | – | Yes |
| Case Management | – | Yes |
| AI Copilot | – | Yes |
| osquery | – | Yes |

### Core features

**Fluency SIEM**

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

**Security Onion Pro**

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

### Integrations

**Fluency SIEM**

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

**Security Onion Pro**

12 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.

- [Fluency SIEM](https://cybersectools.com/tools/fluency-siem) fits if you want a cloud product.
- [Security Onion Pro](https://cybersectools.com/tools/security-onion-pro) fits if you need to run it on your own servers.

## Fluency SIEM vs Security Onion Pro FAQ

Common questions when comparing Fluency SIEM vs Security Onion Pro for security information and event management.

### What is the difference between Fluency SIEM and Security Onion Pro?

**Fluency SIEM**: AI-driven SIEM with streaming analytics, UEBA, and autonomous SOC workflows. Built by Fluency Security.

**Security Onion Pro**: Commercial license tier adding enterprise features and support to Security Onion NSM/SIEM. Built by Security Onion Solutions.

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

### Who makes Fluency SIEM and Security Onion Pro?

**Fluency SIEM** is made by Fluency Security. **Security Onion Pro** is made by Security Onion Solutions. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is Fluency SIEM a good alternative to Security Onion Pro?

Often, yes. Fluency SIEM and Security Onion Pro are both Security Information and Event Management products. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [Fluency SIEM vs Exabeam New-Scale SIEM](https://cybersectools.com/compare/exabeam-new-scale-siem-vs-fluency-siem)
- [Fluency SIEM vs BluSapphire SIEMless-SIEM](https://cybersectools.com/compare/blusapphire-siemless-siem-vs-fluency-siem)
- [Fluency SIEM vs Elastic Security](https://cybersectools.com/compare/elastic-security-siem-vs-fluency-siem)
- [Security Onion Pro vs Exabeam New-Scale SIEM](https://cybersectools.com/compare/exabeam-new-scale-siem-vs-security-onion-pro)
- [Security Onion Pro vs BluSapphire SIEMless-SIEM](https://cybersectools.com/compare/blusapphire-siemless-siem-vs-security-onion-pro)
- [Security Onion Pro vs Elastic Security](https://cybersectools.com/compare/elastic-security-siem-vs-security-onion-pro)

## Alternatives to each

- [See all Fluency SIEM alternatives](https://cybersectools.com/alternatives/fluency-siem)
- [See all Security Onion Pro alternatives](https://cybersectools.com/alternatives/security-onion-pro)

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Source: https://cybersectools.com/compare/fluency-siem-vs-security-onion-pro

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

More on Fluency SIEM and Security Onion Pro: 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