OmniSight vs Security Onion
Security Onion is a free, open-source Linux distribution built for deep network forensics — Zeek protocol analysis, Suricata signature IDS, and optional full packet capture, all sized for real sensor hardware. OmniSight is a lighter-weight, metadata-only network visibility and SOC triage console. The clearest difference: Security Onion can capture full packets; OmniSight never does.
security Choose Security Onion if...
- circleYou need full packet capture (PCAP) and deep protocol/signature analysis (Zeek + Suricata) for real network forensics and incident reconstruction.
- circleYou have dedicated sensor hardware and network taps/SPAN ports, and can commit real RAM budget — 16GB+ for a small network, up to 128–256GB+ for large (1–10Gbps) networks.
- circleYou want an all-in-one Linux distribution that manages its own containerized stack.
- circleYou want the option of paid professional services (Security Onion Pro) for architecture, deployment, and tuning help.
bolt Choose OmniSight if...
- check_circleYou want connection metadata only — never full packet capture, never stored raw traffic.
- check_circleYou want to run on modest self-hosted server hardware, not size a sensor grid against Gbps-scale traffic.
- check_circleYou want a single self-hosted server + lightweight endpoint agent instead of a distributed grid of specialized sensor nodes.
- check_circleYou want dense, purpose-built SOC alert triage out of the box instead of building your own Kibana dashboards.
Side by Side
| Security Onion | OmniSight | |
|---|---|---|
| License / cost model | Free, open-source Linux distribution; optional paid "Security Onion Pro" professional services and support | Licensed monthly plans, self-hosted |
| Deployment shape | Full Linux distro managing its own containerized stack (Zeek, Suricata, Logstash, Redis/Kafka, Elasticsearch, Kibana, SOC Console); standalone or distributed sensor grid | Single self-hosted server + lightweight agent |
| Data scope | Protocol metadata (Zeek) + signature IDS/IPS (Suricata) + optional full packet capture (Stenographer/Suricata) + host telemetry (Elastic Agent, osquery) | Connection metadata only — no payloads, no packet capture, ever |
| Hardware requirements | 24GB+ RAM / 4+ CPU / 200GB storage minimum (standalone); 16GB–256GB+ RAM depending on network throughput (100Mbps–10Gbps); dedicated tap/SPAN interfaces; x86-64 only | Runs on modest self-hosted server hardware; no packet-capture storage to size for |
| Setup time | Setup Wizard simplifies install, but sizing and tuning a sensor grid for real production traffic takes real planning | Minutes — account-gated installer to first event |
| Detection engine | Suricata signature IDS/IPS, Zeek protocol analysis, OpenCanary honeypots | Built-in and custom detections (e.g., cleartext HTTP, CVE-driven rules) |
| Vulnerability matching | Not a core built-in focus | CVE/NVD matching against software inventory, with raw NVD detail |
| Alert triage UI | SOC Console + Kibana visualization | Purpose-built dense alert triage: verdicts, assignment, snooze, suppression history |
| Community / maturity | Long-established open-source project, large security community | Newer, narrower-scope product |
Where Security Onion Genuinely Wins
- Full packet capture and deep protocol/signature analysis for real network forensics and incident reconstruction
- Mature multi-engine detection (Suricata + Zeek + honeypots) with a large, long-established open-source community
- Scales to a distributed sensor grid for large, multi-gigabit networks
- Optional professional services and support available (Security Onion Pro)
Where OmniSight Genuinely Wins
- No packet capture, ever — for teams that don't want the storage footprint, privacy exposure, or compliance burden of retaining raw traffic
- Runs on modest hardware — no 16–256GB RAM sizing exercise or dedicated tap infrastructure required
- Minutes to first event instead of planning and tuning a sensor grid
- Dense, purpose-built SOC alert triage out of the box
Frequently Asked Questions
Is Security Onion free?
Yes — Security Onion is free and open-source. Security Onion Pro adds optional paid professional services and support on top of the free platform.
Is OmniSight a Security Onion alternative?
For teams that want lightweight, connection-metadata visibility and SOC-style triage without full packet capture or a sensor grid to size and maintain, yes.
Does OmniSight do full packet capture like Security Onion?
No — by design. OmniSight is metadata-only; it does not capture, store, or replay packet payloads.
Can I run both?
Yes — some teams run Security Onion for deep network forensics and PCAP on critical segments, and OmniSight for lightweight, always-on metadata visibility across the broader fleet.
See if OmniSight fits your stack
Explore the features, then request access to try it on your own infrastructure.
Security Onion is a trademark of Security Onion Solutions, LLC. This comparison is independently produced by OmniSight and is not affiliated with, endorsed by, or reviewed by Security Onion Solutions, LLC. Figures reflect publicly available information as of July 2026 and may change.