Requestly is a powerful, open-source HTTP interception and API mocking tool designed for developers and QA engineers. It enables users to intercept, modify, debug, and mock HTTP(S) requests and responses in real time, making it easier to build, test, and debug web and mobile applications. The platform is trusted by over 200,000 developers globally, including teams from startups to Fortune 500 companies, and is positioned as a modern alternative to tools like Charles Proxy and Postman.