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Imposter vs Microcks: catalog facts
Imposter	Microcks
Free Free and open source.	Free Free and open source.
macOS, Linux, Self-hosted, Command line	Self-hosted
Creates mocks directly from OpenAPI and WSDL files Runs standalone, in Docker, on Lambda or inside tests	Mocks REST, gRPC, GraphQL and event-driven APIs Tests implementations against API contracts
Advanced plugins require JVM development Configured through files rather than a graphical interface	Needs a server or cluster to run More setup than a desktop API client
Downloadable app, Self-hosted	Self-hosted
Closed 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 October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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