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Best API Clients in 2026

API clients give you a way to send requests, inspect responses and work with API specifications. Compare API documentation and automated test runs, then check GraphQL, gRPC and WebSocket support for the protocols in your workflow.

  1. 01 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
    9.5 Visit Specs
  2. 02 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
  3. 03 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
  4. 04 ReadyAPI
    Free trial Web · Windows · macOS · Linux
    9.2 Visit Specs
  5. 05 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
    9.2 Visit Specs
  6. 06 Testfully

    It suits software engineers, DevOps engineers and software testers who need API testing, monitoring or CI/CD test runs.

    From $10/mo Free plan Web · Windows · macOS · Linux
    9.2 Visit Specs
  7. 07 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
    9.0 Visit Specs
  8. 08 Requestly
    From $10/mo Free trial Windows · macOS · Linux
    8.9 Visit Specs
  9. 09 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
    8.8 Visit Specs
  10. 10 Altair GraphQL Client

    Altair GraphQL Client suits developers who run and debug GraphQL operations and want schema browsing, scripts or plugins.

    From $7.99/mo Free plan Web · Windows · macOS · Linux
    8.8 Visit Specs
  11. 11 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
    8.7 Visit Specs
  12. 12 OpenReq

    OpenReq suits teams and individuals who need API testing, generated documentation, and automated checks across web or desktop environments.

    Free plan Web · Windows · Self-hosted · Browser extension
    8.7 Visit Specs
  13. 13 Firecamp

    Firecamp suits developers and teams working with several API protocols and shared collections.

    Free plan Web · Windows · macOS · Linux
    8.7 Visit Specs
  14. 14 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
    8.6 Visit Specs
  15. 15 httpYac
    Free plan Self-hosted · Browser extension
    8.5 Visit Specs
  16. 16 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
    8.4 Visit Specs
  17. 17 Chapar
    Free plan Windows · macOS · Linux
    8.3 Visit Specs
  18. 18 xh

    xh suits command-line users who want to construct HTTP requests and inspect or save responses.

    Free plan Open source Windows · macOS · Linux · Android
    8.3 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
    8.2 Visit Specs
  20. 20 grpcurl
    Free plan Windows · macOS · Linux · Self-hosted
    8.2 Visit Specs
  21. 21 Insomnium
    Free plan Windows · macOS · Linux · Self-hosted
    8.2 Visit Specs
  22. 22 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
    8.2 Visit Specs
  23. 23 Vegha
    Free plan Windows · macOS · Linux
    8.1 Visit Specs
  24. 24 GraphiQL

    GraphiQL suits developers who need an in-browser GraphQL IDE or want to embed one in a React application.

    Free plan Web · Self-hosted
    8.1 Visit Specs
  25. 25 RESTK
    Free plan Windows · macOS
    7.9 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).

Postman, Apidog and Insomnia are among the named options to consider. Available platforms and team workspaces help you assess where you can work and whether collaboration features suit your needs. The comparison also includes free-plan availability and the “Paid from” price, so you can weigh listed costs alongside capabilities. Look across those details to find differences that matter for the APIs you build, test or maintain.

Compare SoapUI and Apidog Get a place on this list

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