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

Guardsix SIEM: A security information and event management solution that collects, normalizes, and analyzes log data from across an organization's infrastructure to enhance threat detection and compliance reporting. Built by Guardsix.

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.

Guardsix SIEM is made by Guardsix. 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.

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