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Loader.io vs Grafana k6: catalog facts
Loader.io	Grafana k6
Freemium Free load testing service with paid plans listed on its pricing page.	Free The k6 tool itself is free and open source.
Web	Command line
No load generation infrastructure to run yourself Real-time monitoring of each test	Test scenarios written in plain JavaScript Single command-line tool, also usable in Docker
Requires an account and registering your target host Closed source hosted service	Requires writing scripts; no graphical test builder in the tool itself Aimed at developers rather than casual site owners
Hosted service	Downloadable app
Closed source	Open source
License not stated	License not stated
Account needed	No account needed
Needs internet	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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