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Slumber vs ain: catalog facts
Slumber	ain
Free Free and open source.	Free Free to download.
Command line	Windows, macOS, Linux, Command line
Runs entirely in the terminal Request collections are plain YAML files	Requests kept as plain-text files in folders Environment variables and .env file support
No graphical interface Requires writing YAML to define requests	Terminal only, no graphical interface Smaller community than the GUI clients it replaces
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
No account needed	No account needed
Not stated if it works offline	Not stated if it 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.