Alternatives to API Contract Tester

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

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4. 4

   Microcks

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

   Free planWebAPIExtensionLinux
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5. 5OA

   oasdiff

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

   Free planWebAPILinuxmacOS
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6. 6

   Confluent Cloud

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

   Free planWebAPILinux
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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
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8. 8SP

   Specmatic

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

   Free planLinuxmacOSSelf-hostedWindows
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9. 9

   SpecShield

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

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10. 10SC

    Schemathesis

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

    Free planLinuxmacOSSelf-hostedWindows
    6.4Free plan
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11. 11BC

    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
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12. 12AR

    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
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13. 13

    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
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14. 14

    Citrus

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

    Free planLinux
    5.9Free plan
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15. 15KA

    Karapace

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

    Free planAPISelf-hosted
    5.9Free plan
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16. 16

    Stubborn Contract

    Stubborn Contract is the official continuation of Spring Cloud Contract, providing consumer-driven contract testing for HTTP and message-based interactions.

    Free planAPISelf-hosted
    5.9Free plan
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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
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18. 18

    Signet

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

    WebAPISelf-hosted
    5.6
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19. 19

    Entente

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

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    5.5
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20. 20

    ContractCase

    API
    5.3
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21. 21GI

    GraphQL Inspector
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