Hoverfly vs Microcks

Hoverfly Cloud is a hosted API simulation and mocking platform for testing without live API dependencies. It handles HTTP/S services including REST, SOAP, XML, JSON, and GraphQL. Users can capture and replay traffic, generate simulations from OpenAPI specifications, and match requests by methods, headers, parameters, and bodies. Simulations can delay responses, inject faults or errors, and modify replies. A command-line interface supports scripted configuration and testing pipelines. Hoverfly and hoverctl binaries run on macOS, Linux, and Windows, while documentation covers Docker and Kubernetes installation. The underlying Hoverfly framework is open source under Apache 2, has no GUI, and is generally run locally or in a user’s infrastructure. Cloud use cases include performance testing, functional testing, and development.

Microcks is an open-source tool for mocking and testing APIs and microservices. It works with OpenAPI, AsyncAPI, gRPC/Protobuf, GraphQL schemas, and SOAP, and can build mock responses from examples, generate realistic data, or alter mock data and responses dynamically. It also checks provider and consumer contracts against live implementations and specification versions, and automates checks in CI/CD pipelines with integrations for GitHub Actions, Jenkins, GitLab CI, and Tekton. Containerized deployment supports on-premises, cloud, and developer-laptop use; its Uber distribution is intended for laptop work and unit tests, using ephemeral in-memory MongoDB. The free, community marketplace for API mocks and test suites is enabled by default. Microcks is a CNCF incubating project, with a listed price of free. The public demo is read-only and cannot import APIs or change artifacts. Documentation cautions against production use of the all-managed Kubernetes setup because its single Keycloak and MongoDB instances are not tuned for scalability or security best practices.