API Testing Platforms

PostHog is an open-source, all-in-one product analytics platform offering event analytics, session replay, feature flag...

Browserbase provides a reliable, managed browser infrastructure for AI agents, enabling web scraping, automated testing...

Multi-protocol API development platform supporting REST, GraphQL, WebSocket, and gRPC with team collaboration.

Automated API testing and monitoring service that validates web services with continuous integration support.

StatusCake provides uptime monitoring, page speed testing, SSL monitoring, and hosted status pages for websites and API...

Gretel provides a developer-focused platform for generating privacy-preserving synthetic data, supporting structured an...

Open source HTTP mock and validation server that generates realistic responses from OpenAPI specifications.

GUI client for gRPC, REST, and WebSocket APIs with scripting support and environment management.

Property-based API testing tool that automatically generates test cases from OpenAPI and GraphQL specifications.

Open-source unified framework for API test automation, performance testing, and UI automation in Java.

Postman is an API platform for designing, testing, documenting, and monitoring APIs with collaboration features for dev...

Open source tool for debugging, testing, and building with HTTP and HTTPS traffic interception.

Open source API testing framework combining test automation with API mocks and performance.

Intuitive desktop API client for REST, GraphQL, and gRPC with Git-friendly storage and template variables.

Lightweight framework for building mock HTTP servers in Java for integration testing of APIs.

Desktop application for creating mock REST APIs with templating, response rules, and proxy mode for local development.

Command-line tool for running HTTP requests defined in plain text with assertions for testing APIs.

Simple mock HTTP server by Kong for testing and debugging HTTP calls from your apps.

Playwright is an open-source end-to-end testing framework by Microsoft for testing web applications across Chromium, Fi...

CircleCI is a continuous integration and delivery platform that automates build, test, and deployment pipelines. It sup...

Hoppscotch is an open-source API development platform providing a fast, lightweight alternative to Postman for testing...

Open source API testing and monitoring tool that uses YAML-defined test workflows for CI/CD integration.

Open source Kubernetes-native tool for mocking and testing APIs and microservices from OpenAPI and AsyncAPI specs.

API testing tool integrated with the RapidAPI platform for creating, running, and automating API test suites.

Mailjet by Sinch is an email delivery and marketing platform with collaborative editing, API sending, and real-time ana...

Algolia is a search and discovery API platform that helps businesses build fast, relevant search experiences across web...

Integration testing tool by OVH for creating and running API and infrastructure tests with YAML definitions.

Checkly is a monitoring-as-code platform for API monitoring and end-to-end testing that integrates with CI/CD pipelines...

Python-based API testing framework using YAML test definitions with pytest integration for REST and MQTT APIs.

API testing framework designed to test REST and GraphQL APIs with simple YAML configuration.

Scalar generates beautiful, interactive API reference documentation from OpenAPI files with a modern design and develop...

OneSignal is a customer messaging platform specializing in push notifications, email, SMS, and in-app messaging, servin...

API testing platform by SmartBear for functional, security, and performance testing of REST, SOAP, and GraphQL APIs.

Open source API client that stores collections directly in your filesystem using a plain text markup language.

Swagger by SmartBear provides API design, documentation, testing, and governance tools built around the OpenAPI specifi...

Advanced API design and testing tool for macOS with dynamic values, code generation, and team collaboration.

Mock HTTP server and request inspector providing instant endpoints for testing and prototyping APIs.

Open-source contract testing tool Pact ensuring microservices communicate correctly without end-to-end tests.

Mailgun by Sinch is a transactional email API service for developers, providing email sending, receiving, validation, a...

Open source API testing tool by SmartBear supporting REST, SOAP, and GraphQL with assertion-based validation.

Apidog's advanced API design and testing platform combining Postman, Swagger, and Mock capabilities.

Autonomous end-to-end test automation platform using real user behavior data to generate and maintain Cypress tests tha...

Webhook payload delivery service creating unique channels for developers testing GitHub integrations.

Network latency monitoring tool that tracks latency patterns and visualizes performance over time.

Python REST API testing and micro-benchmarking tool with YAML test definitions and assertion validation.

Checkmarx provides a comprehensive application security platform including software composition analysis, SAST, DAST, a...

Perforce's enterprise cloud testing platform for web and mobile apps offering AI-driven test automation, real devices,...

Lightweight REST API client extension for VS Code with collections, environments, and Git-friendly storage.

Pipedream's tool for collecting and inspecting HTTP requests from web applications during development.

CLI tool that auto-generates Postman collections from OpenAPI specs with contract and variation testing.

HTTP Request & Response Service written in Python for testing HTTP clients and APIs.

Browser extension and desktop app for intercepting, modifying, and mocking HTTP requests for debugging and testing.

Cognizant's AI platform providing industry-specific decisioning models and cognitive services.

Cobalt provides Pentest as a Service combining a vetted community of pentesters with a SaaS platform for on-demand secu...

Prismic is a headless page builder and CMS that enables marketers to build pages independently while developers maintai...

Nected is a low-code decision intelligence platform that unifies rule engines and workflow automation for backend proce...