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Grafana k6 vs Loader.io: catalog facts
Grafana k6	Loader.io
Free The k6 tool itself is free and open source.	Freemium Free load testing service with paid plans listed on its pricing page.
Command line	Web
Test scenarios written in plain JavaScript Single command-line tool, also usable in Docker	No load generation infrastructure to run yourself Real-time monitoring of each test
Requires writing scripts; no graphical test builder in the tool itself Aimed at developers rather than casual site owners	Requires an account and registering your target host Closed source hosted service
Downloadable app	Hosted service
Open source	Closed source
License not stated	License not stated
No account needed	Account needed
Works offline	Needs internet
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.