The API design ecosystem is expanding, and it's challenging to keep track of the latest tools. This article aims to help developers choose a suitable tool by highlighting some of the best API design tools, including RapidAPI Design by Paw, Postman, Swagger Editor or Swaggerhub, Mulesoft API Connect, AsyncAPI Playground, Stoplight.io, FastAPI, Apiary, and Apollo. These tools offer various features such as intuitive interfaces, integration with other products, automated testing, monitoring, mocking, and documentation generation. Some tools focus on design-first approaches, while others support code-first approaches. The article also provides information on the differences between REST API and RESTful API, the best ways to design a REST API, and the top API design tools.