Core Viewpoint - The article discusses the increasing importance and variety of API client tools in 2025, highlighting their efficiency and user-friendliness for developers. Group 1: Popular API Client Tools - Postman is a widely used API debugging tool known for its user-friendly interface and comprehensive features, including request building, documentation, and testing assertions [4][5]. - Insomnia is an open-source, lightweight API client that supports REST, GraphQL, and gRPC, designed for developers seeking a simple and efficient interface [8][9]. - Paw is a macOS-specific API client with a beautiful interface and full functionality, including request building and team collaboration features [11][12]. - Hoppscotch is a lightweight, open-source API client that operates in the browser, supporting modern protocols like WebSocket and GraphQL [14]. - Bruno is a new open-source API client that emphasizes offline functionality and project-based request management, suitable for developers concerned about privacy [16][18]. - Apifox is a Chinese API ecosystem tool that integrates API documentation, debugging, mocking, and testing, with a user-friendly design for local developers [19]. - Apipost is another Chinese API client focusing on debugging, documentation generation, and team collaboration, featuring a modern interface [21][22]. - Thunder Client is a lightweight API client plugin for VS Code, allowing developers to debug APIs directly within their coding environment [24][25]. - Advanced REST Client (ARC) is an open-source API debugging tool that has transitioned from a Chrome extension to a standalone desktop application, maintaining its comprehensive functionality [26][27]. - HTTPie is a user-friendly API client that emphasizes human readability, available in both desktop and web versions, supporting REST and GraphQL [28][29].