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vnStat vs bmon: catalog facts
vnStat	bmon
Free Free and open source under the GPL.	Free Free and open source under BSD and MIT licenses.
Linux, Command line	Linux, Command line
Very light, no packet sniffing Statistics persist across reboots	Interactive curses interface with live graphs Scriptable text output
Linux and BSD only Console output by default; graphs need the separate image tool	Terminal only Development is slow compared with newer tools
Downloadable app	Downloadable app
Open source	Open source
License: GPL	License: BSD-2-Clause AND MIT
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

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