Aspen is an innovative and free API-testing native application tailored for macOS users. It specializes in testing REST APIs, offering quick and effective solutions for developers. Leveraging AI, Aspen simplifies the integration process by automatically generating data models, Open API Specs, and integration code to enhance productivity. With Aspen, simply input your parameters to obtain results in under a second, making it an essential tool for seamless API testing and integration. The AI Companion, Alfred, is also included to expedite the development process, ensuring a smarter and faster way to work with APIs.