18.3
HTTPie is an API client for building and testing requests to APIs, HTTP servers, and web services.
Free planOpen sourceWebLinuxmacOS
Best API Testing Tools in 2026
API testing tools support work such as sending requests, checking contracts, and integrating tests into development workflows. The entries are ranked, with Postman, Apidog, and SoapUI among those at the top. Compare CI/CD integration and contract testing with GraphQL and SOAP support, then consider whether mock servers or scheduled runs fit your testing process. Included requests and free-plan availability can help…
28.2
Free planOpen sourceAPIExtensionLinux
38.2
SoapUI is an open-source tool for testing REST, SOAP and GraphQL web services.
Free planOpen sourceAPILinuxmacOS
- 4
Bruno
Bruno is a Git-native API client for exploring and testing REST, GraphQL, gRPC, and WebSocket APIs.
Free planOpen sourceAPIExtensionLinuxmacOS8.1From $6 a month - 5
Apidog
Apidog is an API platform for designing, debugging, mocking, testing, and documenting APIs, with GraphQL and SOAP support.
Free planWebAPIExtensionLinux8.0From $9 a month - 6
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 - 7
Postman
Postman is a platform for designing, testing, distributing, documenting, and monitoring APIs.
Free planWebExtensionLinuxmacOS7.6From $9 a month - 8
ReadyAPI
WebAPILinuxmacOS7.6 - 9
Pact
Pact is a code-first tool for contract testing of HTTP and message integrations.
Free planAPILinuxmacOSSelf-hosted7.5From $115.42 a month - 10
Hoppscotch
Hoppscotch is a collaborative, open-source platform for creating, testing, documenting and sharing APIs.
Free planWebAPILinuxmacOS7.2From $6 a month - 11
Insomnia
Insomnia is an API collaboration platform for designing, testing, debugging, mocking, and governing APIs.
Free planLinuxmacOSSelf-hostedWindows7.2From $12 a month - 12
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 - 13
Kreya
Kreya is a desktop API client for exploring, testing, and automating API workflows.
Free planLinuxmacOSWindows7.1Free plan - 14
Thunder Client
Thunder Client is a REST API client that runs inside VS Code and JetBrains IDEs.
Free planExtensionLinuxmacOSWindows7.0From $3 a month - 15
Yaak
Yaak is a local-first desktop API client for sending requests, debugging APIs, and organizing work with Git.
Free planLinuxmacOSWindows7.0From $79 a year - 16
Assertible
Assertible tests and monitors APIs, websites, and other HTTP services for uptime, availability, and correct behavior.
Free planWebAPI6.9From $25 a month - 17
Parasoft SOAtest
Parasoft SOAtest automates functional, security, and performance testing for APIs and microservices.
AndroidiOSAPILinux6.7 - 18
RESTest
RESTest is a free, open-source black-box tool that generates requests from OpenAPI documents, exercises REST APIs, checks responses, and reports faults.
Free planLinuxSelf-hostedWindows6.5Free plan - 19
EvoMaster
Free planAPILinuxmacOSSelf-hosted6.4Free plan - 20
EvoMaster
EvoMaster is a free, open-source tool that generates system-level tests by fuzzing web and enterprise applications.
Free planAPILinuxmacOSSelf-hosted6.4Free plan - 21
Schemathesis
Schemathesis generates property-based tests from OpenAPI and GraphQL schemas to help engineers find API bugs.
Free planLinuxmacOSSelf-hostedWindows6.4Free plan - 22
Hurl
Hurl is a free command-line tool for running HTTP requests written in a plain-text format.
Free planLinuxmacOSSelf-hostedWindows6.3Free plan - 23
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 - 24
Tavern
Tavern is a free tool for developers who want to automate API tests using YAML.
Free planLinuxSelf-hosted6.3Free plan - 25
PactumJS
PactumJS is a free, open-source REST API automation testing tool for multiple levels of a software test pyramid.
Free planAPI6.2Free plan