Fortinet FortiSIEM vs Security Onion
A side-by-side comparison on deployment model, data residency, licensing basis and security coverage. Structural facts are verifiable against vendor documentation; the scored dimensions are our assessment.
Fortinet FortiSIEM
Fortinet
7.6
Average across eight dimensions
- Deployment
- Self-hosted
- Licensing
- Events per second
- Time to value
- Complex
- Segment
- Mid-market / enterprise
- G2
- —
Security Onion
Security Onion Solutions
7.8
Average across eight dimensions
- Deployment
- Self-hosted
- Licensing
- Free; paid support available
- Time to value
- Complex
- Segment
- SMB / education / research
- G2
- —
Score by dimension
| Dimension | FS | SO |
|---|---|---|
| Data residency control | 9 | 10 |
| Pricing value | 7 | 9.5 |
| Detection accuracy | 7.5 | 8 |
| Response speed | 7.5 | 6.5 |
| Ease of setup | 6.5 | 6 |
| Management UX | 7 | 6.5 |
| Integration depth | 8 | 7.5 |
| Security coverage | 8 | 8 |
Fortinet FortiSIEM
- +Genuinely self-hosted as an appliance or virtual machine
- +Includes configuration management database and asset discovery
- +Cost-effective where Fortinet infrastructure is already in place
- −Interface and workflow rated below newer platforms by most reviewers
- −Events-per-second licensing requires sizing for peak load
Best for Fortinet-standardised networks wanting self-hosted SIEM without a new vendor
Watch out Evaluate the analyst experience directly — this is where reviewers are most critical
Security Onion
- +Free and open source with excellent network security monitoring depth
- +Bundles Suricata, Zeek and full packet capture in one distribution
- +Widely used for training, research and incident response work
- −Network-focused — endpoint and identity coverage is comparatively thin
- −No commercial support unless purchased separately from the project
Best for Teams prioritising network visibility and detection engineering practice
Watch out Not a full enterprise SIEM replacement on its own — plan the endpoint layer separately
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Data last verified 2026-09-16. nPro publishes this comparison. Where nPro appears as one of the platforms listed, its card is marked and its scores are our own assessment. Third-party review scores are sourced from public vendor profiles. Structural facts — deployment model, licensing basis, residency — are verifiable against each vendor's documentation.