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Best API Testing Tools in 2026

Testing an API can involve checking individual requests, validating contracts, or fitting tests into a delivery workflow. Compare CI/CD integration and contract testing, along with GraphQL and SOAP support.

  1. 01 Apidog

    Apidog suits teams that need to design and test APIs from specifications, automate request sequences, or work with Postman data.

    From $9/mo Free plan Web · Windows · macOS · Linux
    9.5 Visit Specs
  2. 02 Bruno

    Bruno suits developers who want API collections stored and reviewed alongside project files in Git.

    From $6/mo Free plan Open source Windows · macOS · Linux · API
    9.4 Visit Specs
  3. 03 HTTPie

    HTTPie suits developers and teams who test or debug APIs across a terminal, desktop, or web workflow.

    From $10/mo Free plan Open source Web · Windows · macOS · Linux
    9.1 Visit Specs
  4. 04 Karate

    Karate suits teams that want API, browser, or desktop testing in a shared framework, especially when they also need mocks or Gatling-based performance tests.

    From $8.33/mo Free plan Open source Windows · macOS · Linux · API
    9.1 Visit Specs
  5. 05 PactFlow

    PactFlow suits software teams that need contract testing across distributed services and want to connect checks to source-control workflows.

    From $115.42/mo Free plan Web · Linux · API · Self-hosted
    8.9 Visit Specs
  6. 06 Pact

    Pact suits developers working on integrations when their team controls both the consumer and provider applications.

    From $115.42/mo Free plan Windows · macOS · Linux · API
    8.8 Visit Specs
  7. 07 ReadyAPI
    Free trial Web · Windows · macOS · Linux
    8.8 Visit Specs
  8. 08 SoapUI

    SoapUI suits developers and testers starting with API testing, especially those working with REST, SOAP, or GraphQL services.

    From $89.08/mo Free plan Open source Windows · macOS · Linux · API
    8.8 Visit Specs
  9. 09 Hoppscotch

    Hoppscotch suits individuals and teams building, testing, documenting or sharing APIs across its supported protocols.

    From $6/mo Free plan Web · Windows · macOS · Linux
    8.6 Visit Specs
  10. 10 Insomnia

    Insomnia suits developers and teams working across API design, testing, debugging, and mock generation.

    From $12/mo Free plan Windows · macOS · Linux · Self-hosted
    8.6 Visit Specs
  11. 11 Postman

    Postman suits people designing, testing, documenting, or monitoring APIs, including teams that need collaboration, integrations, or API testing across multiple protocols.

    From $9/mo Free plan Web · Windows · macOS · Linux
    8.5 Visit Specs
  12. 12 EvoMaster

    It suits teams generating automated API and system tests across web or enterprise applications.

    Free plan Windows · macOS · Linux · API
    8.4 Visit Specs
  13. 13 Kreya

    Kreya suits developers who need to explore or test APIs across several protocols, or automate API checks in CI/CD.

    From $5/mo Free plan Windows · macOS · Linux
    8.4 Visit Specs
  14. 14 Assertible

    Assertible is aimed at QA professionals, developers, and people who operate web services.

    From $25/mo Free plan Web · API
    8.3 Visit Specs
  15. 15 EvoMaster

    EvoMaster suits teams that want to generate API tests for web or enterprise applications, including teams working with REST, GraphQL, or supported RPC APIs.

    Free plan Windows · macOS · Linux · API
    8.3 Visit Specs
  16. 16 Keploy

    Keploy suits development and QA teams that want traffic-derived tests, dependency mocks, and CI replay.

    From $19/mo Free plan Web · Windows · macOS · Linux
    8.3 Visit Specs
  17. 17 RESTest
    Free plan Windows · Linux · Self-hosted
    8.1 Visit Specs
  18. 18 Apiary

    Apiary suits people designing or documenting APIs who want descriptions, mock responses, and automated checks in one hosted workspace.

    Free plan Web · API
    8.0 Visit Specs
  19. 19 Hurl

    Hurl suits developers who want to define HTTP requests as plain text and run API or session checks from the command line.

    Free plan Windows · macOS · Linux · Self-hosted
    8.0 Visit Specs
  20. 20 Parasoft SOAtest

    It suits QA teams, testers and development teams testing APIs and microservices.

    Free trial Windows · macOS · Linux · iOS
    7.9 Visit Specs
  21. 21 Tavern
    Free plan Linux · Self-hosted
    7.9 Visit Specs
  22. 22 Thunder Client

    It suits developers who want an IDE-based API client and can work with locally stored collections.

    From $3/mo Free plan Windows · macOS · Linux · Browser extension
    7.9 Visit Specs
  23. 23 Citrus

    Citrus suits enterprise teams testing messaging scenarios, microservices, and other integrations.

    Free plan Linux
    7.8 Visit Specs
  24. 24 PactumJS
    Free plan API
    7.8 Visit Specs
  25. 25 Yaak

    Yaak suits API developers and teams sharing requests through Git, especially those seeking control over local API data.

    From $6.58/mo Free plan Windows · macOS · Linux
    7.8 Visit Specs
How this list is ordered. Specifiction scores each tool on how fully its maker documents it, whether its prices are published, where the research puts it, the platforms it runs on and whether it can be tried for free (how we rank). Makers can also buy a numbered place (how Specifiction is paid for).

Mock servers and scheduled runs may suit particular testing approaches; included requests, free-plan availability, and paid-from pricing help clarify usage and cost. Apidog, Postman, and Pact offer a starting point for comparing the entries, with Bruno, Insomnia, and Kreya also listed. Consider which protocols and workflow capabilities matter for the APIs you work with, then weigh those against the usage terms shown.

Compare Apidog and Bruno Get a place on this list

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