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#2 Insomnia
A powerful, open‑source REST client with GraphQL support, environment variables, and automated testing.
#3 Hoppscotch
A lightweight, web‑based API request builder supporting REST, GraphQL, WebSocket, and SSE with real‑time collaboration.
#4 Paw
macOS‑only native API client offering advanced request chaining, dynamic values, and visual response inspection.
#5 HTTPie
A command‑line HTTP client with an intuitive syntax, JSON support, and color‑coded output for quick API testing.
#6 RESTer
A Firefox add‑on that provides a simple UI for sending HTTP requests, handling authentication, and viewing responses.
#7 SoapUI
A comprehensive functional testing tool for SOAP and REST APIs, featuring data‑driven testing and security scans.
#8 Apigee
Google‑backed API management platform with built‑in testing, analytics, and lifecycle governance.
#9 Swagger UI
Open‑source tool that renders OpenAPI specifications as interactive documentation and lets you try endpoints directly.
#10 Thunder Client
A VS Code extension that brings a lightweight, Postman‑like experience directly inside the editor.
#11 Katalon Studio
An all‑in‑one test automation solution supporting API, web, mobile, and desktop testing with a codeless UI.
#12 Rested
A macOS native REST client focused on simplicity, with support for authentication, custom headers, and response formatting.
A progressive web app for quick API calls, offering dark mode, code generation, and real‑time collaboration.
A Chrome‑based client that lets you build, test, and debug HTTP requests with a clean UI and export options.
#15 RapidAPI Studio
A cloud‑based API development environment integrated with the RapidAPI marketplace for testing and monitoring.
A cross‑platform desktop client offering request history, environment variables, and response visualizers.
#17 Restfox
A modern, open‑source desktop API client with dark mode, request grouping, and built‑in code snippets.
A free, open‑source API testing tool that integrates with Talend Data Fabric for CI/CD pipelines.
#19 Karate DSL
A BDD‑style testing framework that lets you write API tests in plain‑text Gherkin syntax, runnable via Maven/Gradle.
#20 Assertible
A cloud service for automated API monitoring, testing, and assertions with CI integration.
A SaaS platform for API performance testing, monitoring, and debugging with detailed analytics.