Compare software

Siege vs Loader.io: catalog facts
Siege	Loader.io
Free Free and open source.	Freemium Free load testing service with paid plans listed on its pricing page.
macOS, Linux, Command line	Web
Tests many URLs at once from a list Configurable number of simulated users	No load generation infrastructure to run yourself Real-time monitoring of each test
Command line only, with no graphical reports Scripting options are simpler than in newer load testers	Requires an account and registering your target host Closed source hosted service
Downloadable app	Hosted service
Open source	Closed source
License: GPL-3.0	License not stated
No account needed	Account needed
Works offline	Needs internet
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 24, 2026

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