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

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