Instead of Microcks
Microcks alternatives
Microcks combines API and microservice mocking with provider and consumer contract checks. It supports OpenAPI, AsyncAPI, gRPC/Protobuf, GraphQL, and SOAP; mocks can reuse examples, generate realistic ones, or transform responses. CI/CD integrations support automated checks, and deployment can be on a developer laptop, on-premises, or in the cloud. Its open-source distribution is free, with a community marketplace for API mocks and test suites.
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Mockzilla
Free plan Open source APILinuxMac+3Hosted OpenAPI mocks with pull-request environments — Mockzilla adds hosted mock URLs per pull request, request replay, and backend proxy fallback, while focusing on OpenAPI and JSON mocks.
Free plan · paid from $10/mo Visit site - 2
Beeceptor
Free plan APILinuxMac+3No-code API simulation with controlled failure testing — Beeceptor adds no-code request matching, traffic recording, live-backend proxying, and local tunnels across HTTP, SOAP, GraphQL, and gRPC.
Free plan · paid from $10/mo · 10-day trial Visit site - 3
MockServer
Free plan APILinuxMac+3Self-hosted HTTP, gRPC, and messaging test doubles — MockServer adds HAR and Postman imports, OAuth2/OIDC mocks, messaging brokers, and chaos testing across HTTP, gRPC, and TCP.
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Mockttp
Free plan LinuxMacSelf-hosted+2JavaScript HTTP interception and integration tests — Mockttp is a JavaScript library for intercepting, transforming, and testing HTTP traffic, rather than a multi-protocol API platform.
Open source Visit site - 5
WireMock
Free plan APILinuxMac+3Hosted simulations for APIs and AI coding workflows — WireMock Cloud adds hosted API environments, AI agent integrations, and enterprise governance features such as versioning, audit logs, RBAC, and SSO.
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Mockfly
Free plan APIExtensionLinux+2Hosted REST mocks with browser capture and offline CLI — Mockfly adds hosted REST endpoints, a Chrome request-capture extension, file responses, and AI-generated JSON payloads.
Free plan · paid from €15/mo Visit site - 7
Knockout API
Free plan APIWebImage and video processing through an API — Knockout API processes images and video, including background removal and upscaling, rather than mocking or testing APIs.
Free plan · paid from $0.02 Visit site - 8
Apidog
Free plan APIExtensionLinux+4 - 9
Apollo Studio
Free plan APIExtensionLinux+4 - 10
Mockoon
Free plan APILinuxMac+3 - 11
GraphQL Hive
Free plan APISelf-hostedWeb - 12
oasdiff
Free plan APILinuxMac+3 - 13
Assertible
Free plan APIWeb - 14
AsyncAPI Studio
Free plan ExtensionLinuxMac+3 - 15
Pact
Free plan APILinuxMac+2 - 16
PactFlow
Free plan APILinuxSelf-hosted+1 - 17
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Schemathesis
Free plan LinuxMacSelf-hosted+1 - 19
OpenAPI Studio
Free plan Self-hostedWeb - 20
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TypeSpec
Free plan ExtensionLinuxMac+2 - 22
Stoplight Prism
Free plan APISelf-hostedWeb - 23
Stoplight Elements
Free plan Self-hostedWeb - 24
Swagger Editor
Free plan Self-hostedWeb - 25
Smithy
Free plan LinuxMacWindows - 26
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vacuum
Free plan APIExtensionLinux+3 - 28
Spectral
Free plan LinuxMacWindows - 29
WSO2 API Designer
Free trial ExtensionLinuxMac+2
Its scope is centered on APIs and microservices. The public demo is read-only, the all-managed Kubernetes setup is not recommended for production, and credential management is limited to administrators. When comparing alternatives, consider whether you need hosted endpoints, traffic recording and replay, injected failures, or HTTP interception. Also weigh protocol coverage, local versus hosted workflows, and how much control you need over deployment. These differences help distinguish a focused mock service from a broader testing or traffic-simulation tool.