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Grafana k6 vs Fortio: catalog facts
Grafana k6	Fortio
Free The k6 tool itself is free and open source.	Free Free to use, with the source code published on GitHub.
Command line	Web, Self-hosted, Command line
Test scenarios written in plain JavaScript Single command-line tool, also usable in Docker	Fixed queries-per-second load for repeatable tests Latency histograms and detailed statistics
Requires writing scripts; no graphical test builder in the tool itself Aimed at developers rather than casual site owners	Aimed at developers and operators rather than casual users Measures servers under load, not page rendering speed
Downloadable app	Downloadable app, Self-hosted
Open source	Closed source
License not stated	License not stated
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 October 2, 2026

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