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Hurl vs Slumber: catalog facts
Hurl	Slumber
Free The open-source application is available without a license fee.	Free Free and open source.
Windows, macOS, Linux, Command line	Command line
Request chaining with response assertions	Runs entirely in the terminal Request collections are plain YAML files
Authentication and test data must be configured for the target service.	No graphical interface Requires writing YAML to define requests
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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