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MRTG vs ntopng: catalog facts
MRTG	ntopng
Free Free software under the GNU GPL; sponsorship is optional.	Freemium Licensed editions are sold by ntop, listed as models on the product page.
Windows, Linux, Self-hosted	Windows, macOS, Linux, Self-hosted
Simple per-interface traffic graphs over SNMP Can graph almost any numeric data source	Application detection powered by nDPI Real-time and historical traffic in a web interface
Dated web output compared with modern dashboards Setup is done through configuration files and Perl	Some features need a paid licence Needs a mirror port, TAP or flow exporter to see network traffic
Downloadable app, Self-hosted	Downloadable app, Self-hosted
Open source	Closed source
License: GPL	License not stated
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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