A curated list of awesome HTTP Clients for exploring, debugging, and testing APIs.

• Awesome HTTP Clients
  • GUI
  • CLI
  • WEB
  • Mobile

Desktop HTTP Clients with graphical user interfaces.

• API Test Base - Tool for integration testing a variety of APIs.
• Advanced REST Client - Free and open source API testing tool.
• Amialive (macOS, Linux) - Simple yet powerful HTTP client.
• Auxl (macOS) - A Playground for API Development.
• Bruno Fast and git-friendly open-source API client
• Cocoa Rest Client (macOS) - A free open source, native Apple OS X app for testing HTTP/REST endpoints.
• FRequest - A fast, lightweight and open-source desktop application to make HTTP(s) requests.
• Fiddler - Web debugging proxy for MacOS, Windows, and Linux.
• Firecamp - API platform for GraphQL, REST, SocketIO and WebSocket.
• GetIt (Linux) - Application to send HTTP requests to test your API endpoints.
• HTTP Toolkit - Open-source HTTP(S) debugging proxy, analyzer & client.
• HttpMaster (Windows) - Professional Windows tool for HTTP testing and debugging.
• Humlix - Generate tests for your web APIs in minutes.
• Insomnia - API client for GraphQL, REST, and gRPC.
• Insomnium - 100% local and privacy-focused fork of Insomnia 2023.5.8
• Kreya - gRPC and REST client; Calling APIs made easy
• Milkman - An Extensible Request/Response Workbench.
• Nightingale (Windows) - A modern, resource-efficient REST API client for Windows.
• Paw (macOS) - Fast and feature rich native macOS application.
• Postman - Complete API development environment.
• RESTClient - RESTClient is a Java application to test RESTful web services.
• Requester - Powerful, modern HTTP/REST client for SublimeText.
• Rest Scope (Linux) - a simple http/rest testing tool built to fit right in with your existing Gnome setup; built with D and GtkD.
• Spectator (Linux) - Fully customizable way to test your APIs; native GTK
• Test Mace - Tool for working with an API and creating automated API tests.
• Thunder Client - A lightweight Rest API Client Extension for VS Code.
• WebMaestro (Windows) - Powerful and simple REST and SOAP tools for developers and testers.
• Wisdom rest-client - A tool for automated testing REST API.
• YaakApp - Yaak helps you interact with REST, GraphQL, and gRPC and Websocket.
• friflo POST - HTTP Client for VS Code to POST JSON, XML, image, ... files to REST APIs.

HTTP Clients accessible from terminal.

• HttPie - A command-line tool for transferring data with URL syntax.
• cURL - Modern, user-friendly command-line HTTP client.
• curlie - The power of curl, the ease of use of httpie.
• curlx - API Interaction with history, collections and more.

Web based HTTP Clients (Websites, Browser extensions).

• Hoppscotch - Open source API development ecosystem.
• RESTer - Browser extension REST client for almost any web service.
• Restfox - Simple browser-based REST client can be installed as Chrome app.
• Resting - WebExtension that permits to test and analyze HTTP request directly from you browser.
• Stoplight - Stoplight is an API Design, Development, and Documentation platform.
• Swagger - Design, describe, and document APIs on open source editor dedicated to OpenAPI-based APIs.

Mobile HTTP Clients for Android and iOS (apps)

• ApiClient (Android) - Test Rest APIs with your phone.
• HTTP Client (Android) - A simple tool for sending customized HTTP requests and viewing responses.
• HTTPBot (iOS) - Make requests & debug APIs on the go.
• Httper - An App for developers to test REST API.
• Overlog (iOS) - The simplest App Debugger for iOS.