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nfdump vs SiLK: catalog facts
nfdump	SiLK
Free Free and open source under a BSD license.	Free Free under the GNU General Public License version 2.
Linux, Self-hosted, Command line	macOS, Linux, Command line
Supports NetFlow, IPFIX and sFlow Filtering and aggregation of stored flow records	Collects IPFIX and multiple NetFlow versions Stores flow records in compact files
Command-line only, with no built-in graphical interface Needs network devices configured to export flow data	Designed for large network traffic datasets Requires a separate flow data collection setup
Downloadable app, Self-hosted	Downloadable app
Open source	Open source
License: BSD	License: GPL-2.0-or-later
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 8, 2026

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