18.2
Free planOpen sourceAPIExtensionLinux
Alternatives to HyperTest
28.2
LocalStack simulates cloud environments on customer infrastructure so developers and AI agents can validate cloud applications before deployment.
Free planOpen sourceWebAPIExtension
38.2
SoapUI is an open-source tool for testing REST, SOAP and GraphQL web services.
Free planOpen sourceAPILinuxmacOS
- 4
Beeceptor
Beeceptor is a developer-focused API simulation platform for creating mocks, virtualizing services, testing contracts, and simulating failures.
Free planWebAPILinuxmacOS7.9From $10 a month - 5
PactFlow
PactFlow is a managed Pact Broker for checking whether services in a distributed system meet their integration contracts.
Free planWebAPILinuxSelf-hosted7.6From $115.42 a month - 6
ReadyAPI
WebAPILinuxmacOS7.6 - 7
Pact
Pact is a code-first tool for contract testing of HTTP and message integrations.
Free planAPILinuxmacOSSelf-hosted7.5From $115.42 a month - 8
Keploy
Keploy records application traffic and turns it into API tests and dependency sandboxes for local development, CI, and Kubernetes verification.
Free planWebAPIExtensionLinux7.2From $19 a month - 9
Microcks
Microcks is a free, open-source tool for mocking and testing APIs and microservices.
Free planWebAPIExtensionLinux7.2Free plan - 10
Testcontainers Desktop
Testcontainers Desktop is a companion app for the open-source Testcontainers libraries, designed to support local development and testing with real dependencies.
Free planWebAPILinuxmacOS7.2Free plan - 11
Assertible
Assertible tests and monitors APIs, websites, and other HTTP services for uptime, availability, and correct behavior.
Free planWebAPI6.9From $25 a month - 12
Mockoon
Mockoon is a free, open-source tool for designing and running mock APIs locally.
WebAPILinuxmacOS6.8From €10 a month - 13
Specmatic
Specmatic turns API specifications into executable contracts used to design, build, and govern APIs.
Free planLinuxmacOSSelf-hostedWindows6.8From $120 a year - 14
Hoverfly
Hoverfly Cloud is a hosted API simulation and mocking service for development and testing that should not rely on live API dependencies.
WebAPILinuxmacOS6.7From $10 a month - 15
MockServer
MockServer is free, self-hosted software for mocking and proxying HTTP, HTTPS, and gRPC services in isolated, deterministic testing.
Free planWebAPILinuxmacOS6.6Free plan - 16
Automic Continuous Delivery Automation
Automic Continuous Delivery Automation orchestrates application releases and deployments, with real-time monitoring and release reporting.
WebAPILinuxSelf-hosted6.5 - 17
Schemathesis
Schemathesis generates property-based tests from OpenAPI and GraphQL schemas to help engineers find API bugs.
Free planLinuxmacOSSelf-hostedWindows6.4Free plan - 18
WireMock
WireMock simulates APIs and software dependencies, letting teams test without relying on those services, explore edge cases, and develop dependent features in parallel.
Free planWebAPILinuxSelf-hosted6.4Free plan - 19
Stoplight Prism
Stoplight Prism is a free, open-source command-line HTTP server for turning OpenAPI descriptions or Postman Collections into mock API servers.
Free planWebAPISelf-hosted6.3Free plan - 20
DbFit
DbFit is a free, open source framework for writing unit and integration tests for database code.
WebLinuxSelf-hostedWindows6.1 - 21
Citrus
Citrus is a free test framework for automated integration testing of messaging applications and microservices.
Free planLinux5.9Free plan - 22
Step CI
Step CI is a self-hosted, open-source framework for API security, performance, and load testing.
Free planSelf-hosted5.9Free plan - 23
Parasoft Virtualize
WebLinuxmacOSWindows5.3 - 24
OpenText Service Virtualization
OpenText Service Virtualization is a self-hosted tool for service virtualization, database testing, and test data management.
WebLinuxWindows5.2 - 255.1