Postman is a popular API development environment for designing, testing, and documenting APIs. Below is a curated list of 20 alternative tools that developers can use for API testing, debugging, and documentation.
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A powerful, open‑source REST client with GraphQL support, environment variables, and automated testing.
A lightweight, web‑based API request builder supporting REST, GraphQL, WebSocket, and SSE with real‑time collaboration.
macOS‑only native API client offering advanced request chaining, dynamic values, and visual response inspection.
A command‑line HTTP client with an intuitive syntax, JSON support, and color‑coded output for quick API testing.
A Firefox add‑on that provides a simple UI for sending HTTP requests, handling authentication, and viewing responses.
A comprehensive functional testing tool for SOAP and REST APIs, featuring data‑driven testing and security scans.
Google‑backed API management platform with built‑in testing, analytics, and lifecycle governance.
Open‑source tool that renders OpenAPI specifications as interactive documentation and lets you try endpoints directly.
A VS Code extension that brings a lightweight, Postman‑like experience directly inside the editor.
An all‑in‑one test automation solution supporting API, web, mobile, and desktop testing with a codeless UI.
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.
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.
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.
A BDD‑style testing framework that lets you write API tests in plain‑text Gherkin syntax, runnable via Maven/Gradle.
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.