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autocannon vs Siege: catalog facts
autocannon	Siege
Free Free and open source.	Free Free and open source.
Command line	macOS, Linux, Command line
Quick to run from the command line against any URL Can also be used programmatically from Node.js	Tests many URLs at once from a list Configurable number of simulated users
Tests HTTP/1.1 only Requires Node.js to be installed	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: MIT	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 24, 2026

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