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Inso vs httpYac: catalog facts
Inso	httpYac
Free Free to download and use as part of Kong's Insomnia platform.	Free Free to use.
macOS, Command line	Command line
Runs Insomnia tests and collection runs in CI/CD Lints API specifications with support for custom rules	Plain-text request files that fit in version control REST, SOAP, GraphQL and gRPC in one tool
Most useful alongside the Insomnia desktop app Command line only, no graphical interface	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
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 23, 2026

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