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httpYac vs SoapUI Open Source: catalog facts
httpYac	SoapUI Open Source
Free Free to use.	Free The open source edition is free; the commercial ReadyAPI product is paid.
Command line	Windows, macOS, Linux
Plain-text request files that fit in version control REST, SOAP, GraphQL and gRPC in one tool	Strong SOAP and WSDL support Functional test suites with custom scripting
No standalone graphical app; works through the CLI or VS Code Scripting requires familiarity with Node.js	GraphQL, gRPC and CI integrations are reserved for paid ReadyAPI Website heavily promotes the commercial product
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 September 23, 2026

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