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Slumber vs ATAC: catalog facts
Slumber	ATAC
Free Free and open source.	Free Free and open source under the MIT licence.
Command line	Windows, macOS, Linux, Command line
Runs entirely in the terminal Request collections are plain YAML files	Full API client inside the terminal Optional Vim key bindings
No graphical interface Requires writing YAML to define requests	Still working toward its 1.0 release No graphical interface for people who prefer a mouse
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: MIT
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 23, 2026

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