Question: I need a macOS app for testing and integrating REST APIs, any recommendations?

For testing and integrating REST APIs on a macOS, Aspen is a great option. Aspen is a free, graphical API testing tool that runs completely on your Mac, protecting your data and keeping things simple. It's got an integrated AI assistant called Alfred that can create data models, Open API Specs and integration code to speed up API testing and integration. The tool supports parameterized testing and shows results quickly, making it a good choice for API designers and testers.

Another contender is ReAPI, which uses AI and ChatGPT to accelerate API design, testing and documentation. ReAPI includes a visual API designer, a no-code test case designer and a serverless cloud runner that produces detailed test reports and automated documentation. It's geared for developers who need collaboration abilities, versioning and permission controls to ensure high-quality, reusable APIs.

If you're looking for a more complete testing tool, check out Katalon. Katalon is an end-to-end software quality management platform that can be used to test web, mobile, API, desktop and packaged applications. It includes no-code test recording, drag-and-drop test objects and AI-powered tools like TrueTest and StudioAssist. Katalon integrates with common CI tools and has flexible pricing, so it's a good choice for teams looking to improve testing speed and productivity.