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