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SoapUI Open Source vs httpYac: catalog facts
SoapUI Open Source	httpYac
Free The open source edition is free; the commercial ReadyAPI product is paid.	Free Free to use.
Windows, macOS, Linux	Command line
Strong SOAP and WSDL support Functional test suites with custom scripting	Plain-text request files that fit in version control REST, SOAP, GraphQL and gRPC in one tool
GraphQL, gRPC and CI integrations are reserved for paid ReadyAPI Website heavily promotes the commercial product	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 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.