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Slumber vs httpYac: catalog facts
Slumber	httpYac
Free Free and open source.	Free Free to use.
Command line	Command line
Runs entirely in the terminal Request collections are plain YAML files	Plain-text request files that fit in version control REST, SOAP, GraphQL and gRPC in one tool
No graphical interface Requires writing YAML to define requests	No standalone graphical app; works through the CLI or VS Code Scripting requires familiarity with Node.js
Downloadable app	Downloadable app
Open source	Open source
License not stated	License not stated
No account needed	No account needed
Not stated if it works offline	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.