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Grafana k6 vs Siege: catalog facts
Grafana k6	Siege
Free The k6 tool itself is free and open source.	Free Free and open source.
Command line	macOS, Linux, Command line
Test scenarios written in plain JavaScript Single command-line tool, also usable in Docker	Tests many URLs at once from a list Configurable number of simulated users
Requires writing scripts; no graphical test builder in the tool itself Aimed at developers rather than casual site owners	Command line only, with no graphical reports Scripting options are simpler than in newer load testers
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0
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.