Requestly combines features of API clients and HTTP interceptors, making it a versatile tool for developers. It functions as a Chrome extension or a desktop application, allowing users to build, test, and mock APIs efficiently. Key features include local workspaces for privacy, an intuitive REST API client, and an HTTP rules function for intercepting and modifying requests and responses. Users can create environments with variables and manage them easily, while team workspaces enhance collaboration through synchronization options like Git and Google Drive. The API mocking capabilities are particularly robust. Users can create local mocks, override responses dynamically with JavaScript, and even support GraphQL APIs by targeting specific queries. The ability to record API traffic and serve mocks from those recordings streamlines the testing process. Requestly also facilitates the import of configurations from popular tools like Postman and offers extensive documentation for users seeking guidance. For developers interested in contributing, Requestly encourages community involvement. There’s a clear structure for getting started, with modules to work on including the browser extension, UI application, and backend systems. The repository hosts the source code, and support is available through various channels, including Discord and StackOverflow.