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httpYac vs Inso: catalog facts
httpYac	Inso
Free Free to use.	Free Free to download and use as part of Kong's Insomnia platform.
Command line	macOS, Command line
Plain-text request files that fit in version control REST, SOAP, GraphQL and gRPC in one tool	Runs Insomnia tests and collection runs in CI/CD Lints API specifications with support for custom rules
No standalone graphical app; works through the CLI or VS Code Scripting requires familiarity with Node.js	Most useful alongside the Insomnia desktop app Command line only, no graphical interface
Downloadable app	Downloadable app
Open source	Open source
License not stated	License not stated
No account needed	Not stated if an account is 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 October 1, 2026

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