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Loadster vs Grafana k6: catalog facts
Loadster	Grafana k6
Freemium Free to start testing, with paid plans for larger tests.	Free The k6 tool itself is free and open source.
Web	Command line
Choice of real browsers, HTTP bots or Playwright scripts Runs from 32 cloud regions	Test scenarios written in plain JavaScript Single command-line tool, also usable in Docker
Cloud service only, not self-hostable Large tests require a paid plan	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 October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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