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Tsung vs Grafana k6: catalog facts
Tsung	Grafana k6
Best for: Developers testing the capacity of network services	Best for: Developers load testing websites and APIs with tests kept as code
Free Free and open source under the GPL-2.0 license.	Free The k6 tool itself is free and open source.
Linux, Command line	Command line
Distributed load testing Supports HTTP and several database and messaging protocols All 3 strengths for Tsung Distributed load testing Supports HTTP and several database and messaging protocols Includes a user manual and examples	Test scenarios written in plain JavaScript Single command-line tool, also usable in Docker All 3 strengths for Grafana k6 Test scenarios written in plain JavaScript Single command-line tool, also usable in Docker Large, actively maintained project
Requires Erlang	Requires writing scripts; no graphical test builder in the tool itself Aimed at developers rather than casual site owners
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Offline features available
Official website Full listing and sources Sources for Tsung github.com/processone/tsung Catalog checked October 8, 2026	Official website Full listing and sources Sources for Grafana k6 github.com/grafana/k6 Catalog checked September 23, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.