Compare software

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

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