Alternatives to Stubborn Contract

18.2

Karate

Free planOpen sourceAPIExtensionLinux

From $100 a year

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27.6

PactFlow

PactFlow is a managed Pact Broker for checking whether services in a distributed system meet their integration contracts.

Free planWebAPILinux

From $115.42 a month

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37.5

Pact

Pact is a code-first tool for contract testing of HTTP and message integrations.

Free planAPILinuxmacOS

From $115.42 a month

VisitDetails

4. 4

   Microcks

   Microcks is a free, open-source tool for mocking and testing APIs and microservices.

   Free planWebAPIExtensionLinux
   7.2Free plan
   Visit
5. 5OA

   oasdiff

   oasdiff compares OpenAPI specifications, creates changelogs, and flags breaking changes before release.

   Free planWebAPILinuxmacOS
   7.2From $100 a month
   Visit
6. 6

   Confluent Cloud

   Confluent Cloud is a managed data streaming platform built around a serverless Apache Kafka engine.

   Free planWebAPILinux
   7.1From $385 a month
   Visit
7. 7PB

   Pact Broker

   Pact Broker shares consumer-driven contracts and verification results, primarily for Pact contracts, while also accepting contracts that can be represented as JSON.

   Free planWebAPILinuxSelf-hosted
   6.8From $115.42 a month
   Visit
8. 8SP

   Specmatic

   Specmatic turns API specifications into executable contracts used to design, build, and govern APIs.

   Free planLinuxmacOSSelf-hostedWindows
   6.8From $120 a year
   Visit
9. 9

   API Contract Tester

   API Contract Tester checks whether API responses match an expected contract, helping frontend and backend teams find schema differences.

   Free planWeb
   6.6From $19 a month
   Visit
10. 10

    SpecShield

    SpecShield compares OpenAPI descriptions to flag changes that could break existing API consumers, then reports results as GitHub checks.

    Free planWebAPIExtension
    6.5From $89 a month
    Visit
11. 11SC

    Schemathesis

    Schemathesis generates property-based tests from OpenAPI and GraphQL schemas to help engineers find API bugs.

    Free planLinuxmacOSSelf-hostedWindows
    6.4Free plan
    Visit
12. 12BC

    BBC Consumer Contracts

    BBC Consumer Contracts is a free JavaScript project for describing executable API contracts from a consumer's perspective.

    Free planAPISelf-hosted
    6.2Free plan
    Visit
13. 13AR

    Apicurio Registry

    Apicurio Registry is a runtime server for storing API designs and schemas as artifacts, which users can add, update, or remove through a REST API.

    WebAPILinuxmacOS
    6.1
    Visit
14. 14

    BitDive

    BitDive records runtime behavior in Java and Kotlin services and turns executions into replayable JUnit 5 tests for checking code changes.

    Free planWebAPISelf-hosted
    6.1Free plan
    Visit
15. 15

    Citrus

    Citrus is a free test framework for automated integration testing of messaging applications and microservices.

    Free planLinux
    5.9Free plan
    Visit
16. 16KA

    Karapace

    Karapace is a free, open-source implementation of the Kafka Schema Registry and Kafka REST Proxy.

    Free planAPISelf-hosted
    5.9Free plan
    Visit
17. 17WC

    WSO2 Contract Test Runner

    WSO2 Contract Test Runner is an open-source library for checking live REST API endpoints against consumer-defined contracts.

    Free planLinuxSelf-hosted
    5.8Free plan
    Visit
18. 18

    Signet

    Signet is an open-source framework for contract testing microservices against defined specifications.

    WebAPISelf-hosted
    5.6
    Visit
19. 19

    Entente

    Entente is an open-source contract testing platform that uses OpenAPI specifications alongside recorded API interactions.

    WebAPISelf-hosted
    5.5
    Visit
20. 20

    ContractCase

    API
    5.3
    Visit
21. 21GI

    GraphQL Inspector
    4.4
    Visit

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