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