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Security Onion vs ntopng: catalog facts
Security Onion	ntopng
Freemium The platform is free, while Onion AI features are offered through sales representatives.	Freemium Licensed editions are sold by ntop, listed as models on the product page.
Linux, Self-hosted	Windows, macOS, Linux, Self-hosted
Complete monitoring platform installed from a single ISO Includes packet capture, detection rules and threat hunting	Application detection powered by nDPI Real-time and historical traffic in a web interface
Needs dedicated hardware or virtual machines and setup time Onion AI details are only available through sales	Some features need a paid licence Needs a mirror port, TAP or flow exporter to see network traffic
Self-hosted, Operating system	Downloadable app, Self-hosted
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.