Security Onion and Trivy are both free, open-source security tools, but they operate at completely different layers: Security Onion is a network security…
Best for Security Onion: Security Onion fits security operations teams doing network security monitoring, threat hunting, and log management on live infrastructure, with an optional Pro tier adding Onion AI for AI-driven alert analysis and detection tuning.
Best for Trivy: Trivy fits DevSecOps and platform engineering teams that need to scan code repositories, container images, and Kubernetes clusters for vulnerabilities, misconfigurations, and secrets as part of CI/CD, and generate SBOMs, all under the free Apache-2.0 license.
At a Glance
Security Onion
Trivy
Primary category
Security
Security
Rating
Not documented
Not documented
Pricing model
Free and open source software, with paid training, support, and professional services sold separately
open-source
Starting price
Free (open-source distribution); paid training and support plans available on request
Free
Free plan
Not documented
Yes
Free trial
Not documented
Not documented
Platforms
Web
Not documented
Team collaboration
Not documented
Not documented
AI features
Yes
Not documented
Public API
Not documented
Not documented
Key Differences
Security Layer Covered
Security Onion: Security Onion focuses on Network Security Monitoring and Threat Hunting — analyzing live network traffic and logs for active threats.
Trivy: Trivy focuses on Vulnerability scanning, Misconfiguration detection, Secret scanning, and SBOM generation across code, images, and clusters before or independent of runtime.
Runtime threat detection and pre-deployment artifact scanning address different stages of the security lifecycle and are typically not substitutes for each other.
Deployment Model
Security Onion: Security Onion is deployed as a full platform (built on Suricata, Zeek, and the Elastic Stack) that requires in-house expertise to deploy and tune for network monitoring.
Trivy: Trivy is a CLI-first tool that integrates with CI/CD or the command line rather than offering a hosted dashboard out of the box, and integrates with Docker, GitLab, Azure Container Registry, and Harbor.
Platform-style deployments suit dedicated security infrastructure, while CLI-first tools slot directly into existing developer workflows.
SBOM & Supply Chain Coverage
Security Onion: Security Onion's documented features do not include SBOM generation or software supply chain scanning.
Trivy: Trivy produces a Software Bill of Materials for container images and file systems and performs License checking on project dependencies.
Software supply chain visibility (SBOMs, license risk) is increasingly required for compliance and vendor risk assessments.
AI Features
Security Onion: Security Onion offers Onion AI for AI-assisted alert analysis and detection tuning, with local model support in the paid Pro tier.
Trivy: Trivy's documented features do not include an AI capability.
AI-assisted triage helps reduce the volume of alerts a human analyst must review manually.
Licensing & Support Model
Security Onion: Security Onion's Community edition is free, with an optional paid Pro tier whose pricing is not publicly disclosed.
Trivy: Trivy is entirely free and open source under the permissive Apache-2.0 license, maintained by Aqua Security, with no official enterprise support plan documented on its website.
Understanding what, if anything, requires payment shapes long-term budget planning for either tool.
Feature-by-Feature
Detection Scope
Feature
Security Onion
Trivy
Network traffic monitoring
Available
Unavailable
Container image vulnerability scanning
Unavailable
Available
Kubernetes cluster scanning
Not documented
Available
Secret scanning in code/images
Unavailable
Available
Supply Chain & Compliance
Feature
Security Onion
Trivy
SBOM generation
Unavailable
Available
License risk checking
Unavailable
Available
Threat hunting / log investigation
Available
Unavailable
Deployment & Cost
Feature
Security Onion
Trivy
Free open-source core
Available
Available
AI-assisted analysis
Limited
Unavailable
CI/CD-native CLI usage
Not documented
Available
Pricing Compared
Starting price reflects the lowest paid tier, not the full cost for every team size or usage level.
Security Onion
Security Onion Software — Free N/A
On-Demand Training (Free tier) — Free N/A
On-Demand Training (Premium tier) — Custom quote Contact sales
Instructor-Led Training — Custom quote Contact sales
Support and Professional Services — Custom quote Contact sales
Trivy
Trivy Open Source — Free N/A
Aqua Platform (commercial) — Custom pricing Annual contract
Pros & Cons
Security Onion
Pros
Completely free and open-source with no licensing cost at any deployment scale
Bundles proven, widely trusted security tools like Suricata, Zeek, and the Elastic Stack into one distribution
Backed by an official company, Security Onion Solutions LLC, offering legitimate paid training and support
Large reported install base with over 1,000,000 downloads across nearly every country
Government pricing available through partner IntelliGenesis for public sector buyers
Cons
No public pricing for official training, support, or professional services, requiring direct contact with sales
Self-managing a Security Onion deployment without paid support requires significant in-house security expertise
As a bundle of multiple complex open-source tools, initial setup and tuning can be resource-intensive
Community-based free support may be slower than paid support tiers for urgent issues
Requires dedicated hardware or infrastructure sizing planning, especially for larger network monitoring deployments
Trivy
Pros
Completely free and open source under Apache 2.0 with no feature gating
Single static binary with no external dependencies, simple to install and run
Broad scanning coverage spanning five target types and four scanner engines in one tool
Low false-positive rate, including on historically difficult distributions like Alpine and RHEL
Backed by Aqua Security with active, well-funded maintenance and a large contributor base
Cons
Centralized dashboards, reporting, and runtime protection require the separate paid Aqua Platform
Can require tuning to reduce noise in very large monorepos or legacy codebases
No built-in remediation workflow beyond CLI and CI output
Kubernetes-native features add complexity for teams not already running container orchestration
Use Cases
Choose Security Onion: Security Onion fits security operations teams doing network security monitoring, threat hunting, and log management on live infrastructure, with an optional Pro tier adding Onion AI for AI-driven alert analysis and detection tuning.
Choose Trivy: Trivy fits DevSecOps and platform engineering teams that need to scan code repositories, container images, and Kubernetes clusters for vulnerabilities, misconfigurations, and secrets as part of CI/CD, and generate SBOMs, all under the free Apache-2.0 license.
Need both: A DevSecOps team could use Trivy in CI/CD to catch vulnerabilities, secrets, and misconfigurations before container images are deployed, then run Security Onion in production to monitor network traffic and hunt for threats against the systems those images run on — covering pre-deployment and runtime security respectively.
Security Onion
Network security monitoring for security operations centers — SOC teams deploy Security Onion to combine Suricata, Zeek, and the Elastic Stack into a unified threat hunting and monitoring platform.
Budget-conscious threat hunting for small IT teams — Small IT and security teams use Security Onion's free distribution to gain enterprise-grade monitoring capability without software licensing costs.
Hands-on cybersecurity training and labs — Educators and individual practitioners use Security Onion's free and paid training offerings to build practical network security monitoring skills.
Trivy
DevSecOps CI/CD scanning — Embedding vulnerability and misconfiguration checks directly into build pipelines before code or images ship.
Container image security — Scanning container images for OS and application vulnerabilities before deployment to production.
Cloud infrastructure-as-code audits — Detecting misconfigurations in Terraform and Kubernetes manifests before infrastructure is provisioned.
Frequently Asked Questions
Do Security Onion and Trivy compete with each other?
Not directly — Security Onion monitors live network traffic and hosts for active threats, while Trivy scans code, container images, and Kubernetes clusters for vulnerabilities, misconfigurations, and secrets, typically earlier in the development pipeline.
Which tool generates SBOMs?
Trivy produces a Software Bill of Materials for container images and file systems. Security Onion does not document SBOM generation among its features.
Are both tools free?
Yes. Security Onion's Community edition is free and open source, with an optional paid Pro tier for AI features. Trivy is entirely free and open source under the Apache-2.0 license with no paid tier documented.
Which tool is better for CI/CD pipelines?
Trivy is CLI-first and integrates with CI/CD systems and registries like Docker, GitLab, Azure Container Registry, and Harbor. Security Onion is a network monitoring platform, not a CI/CD scanning tool.
Does Security Onion scan container images or code?
No, Security Onion's documented features focus on network security monitoring, threat hunting, and log management rather than scanning code repositories or container images.
Which tool has AI features?
Security Onion offers Onion AI for AI-assisted alert analysis and detection tuning, with local model support in its paid Pro tier. Trivy's documented feature list does not include AI capabilities.