Best API Testing tools

Discover, test, subscribe to, and publish APIs through a public marketplace and enterprise hub.

A visual and code-based automation tool for functional web and desktop testing, with API and load features in the Ultimate edition.

Records web and mobile user flows as hosted automated tests, with AI prompts and run diagnostics.

Test your own web application with end-to-end, component, and API test workflows.

Create and run browser, mobile, API, performance, and accessibility checks with a hosted test platform.

Structure GUI and API test cases around solutions, technology add-ins and repeatable execution reports.

Write API, UI, performance, and mock tests in readable feature files using one test framework.

Build hosted API simulations to test applications without waiting on live dependencies.

Design API specifications, send requests, generate mocks, run tests, and publish documentation in one project.

Model performance scenarios for applications and APIs, generate virtual-user load and analyze run results.

A managed test-automation platform for authoring and running web, mobile, API, desktop, and Salesforce tests.

Check whether independently developed services agree on the HTTP and message contracts they use.

Generate API checks from OpenAPI or GraphQL schemas and exercise real endpoints with varied inputs.

Record and run realistic web and API load tests in real browsers, then review user-facing timings.

Design, send, test and mock API requests from a desktop workspace with local, Git or cloud storage options.

A contract-testing service for checking compatibility between API and microservice consumers and providers.

Build functional, security and performance tests for APIs, then automate the runs in CI.

Creates API and integration regression tests from API specifications or recorded application traffic.

Compose API requests, inspect responses, and organize repeatable calls into collections.

Run cloud performance tests for web applications and APIs from scripts you supply.

Create functional API tests from specifications or recorded traffic, then extend them into security and performance checks.

An AppSec workflow that tests running applications and helps coding agents find, fix, and verify exploitable issues before a pull request.

A command-line tool for sending HTTP requests and asserting the responses as repeatable tests.

Run saved Postman collection tests from a terminal or CI pipeline, and lint API specifications.