The most intuitive desktop API client. Organize and execute REST, GraphQL, WebSockets, Server Sent Events, and gRPC 🦬

Design, Test and Document APIs in plain Markdown. Compose Requests with API blocks. Reuse, Replace & Version everything just like code. Offline, Truly Git Native, No Lock-in.

Awesome API Clients & Postman Alternatives (Open Source, Free, Pro)

A text-based HTTP client in the browser. An interface-less Postman.

Lightweight file-based API client for terminal nerds

Self-hosted, web-based REST API client. A lightweight Postman alternative for teams. No desktop install, no data leaves your network.

API client for code-first teams. Test, automate, and observe APIs from .http files.

A lightweight, open-source API client built with React and TypeScript. Features collections, environments, cURL/Postman/OpenAPI import, multi-tab interface, and dark/light themes.

Postman-grade API client for every developer — local-first, git-friendly collections, built-in load testing, unlimited history

A developer and git friendly offline-only API client designed for efficient API testing and development. It stores the collections and requests as YAML files on your local file system, making it convenient to organize, reuse, and share your APIs. (Alternative to Postman and Insomnia)

High-Performance API Testing Platform

RESTUI API Client In Your Terminal

Fast, lightweight, privacy-focused API client. No sign-up required.

A modern, lightweight, self-hostable API client. No accounts, no cloud, no telemetry.

A colorful, lightweight command-line HTTP client similar to Postman. Built with Go for fast performance and beautiful terminal output.

RestFlow is a lightweight, minimal web based REST client built on Sveltekit, inspired by tools like Thunder Client and Postman — but focused on speed, simplicity, and zero bloat.

A modern, feature-rich API client and testing studio for developers. Build, test, and debug APIs with an intuitive interface.

pyapptest is a developer-friendly, plug-and-play API testing utility built with Python. It helps you auto-detect, test, and document API endpoints from popular frameworks like FastAPI, Flask, and Django — all within a clean Streamlit-based interface.

Chrome extension (Manifest V3) that captures every network request on any tab — full URLs, headers, cookies, query params, POST bodies, response headers, Set-Cookie, response bodies (text + binary) — and exports the whole session as ZIP, JSON, HAR or CSV in one click. Zero dependencies, 100% local, no telemetry.

The professional, privacy-focused alternative to Postman. 100% local, scriptable, and built with pure Java for maximum efficiency.