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Locust vs Siege: catalog facts
Locust	Siege
Free Free and open source; paid support is available separately from Locust.cloud.	Free Free and open source.
Windows, macOS, Linux, Command line	macOS, Linux, Command line
Test scenarios written as ordinary Python code Distributed runs across multiple machines	Tests many URLs at once from a list Configurable number of simulated users
Requires writing Python to define tests Documentation is focused mainly on HTTP testing	Command line only, with no graphical reports Scripting options are simpler than in newer load testers
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
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.