API Blueprint vs Charles: What are the differences?

Developers describe API Blueprint as "A powerful high-level API design language for web APIs". API Blueprint is simple and accessible to everybody involved in the API lifecycle. Its syntax is concise yet expressive. With API Blueprint you can quickly design and prototype APIs to be created or document and test already deployed mission-critical APIs. On the other hand, Charles is detailed as "HTTP proxy / HTTP monitor / Reverse Proxy". Charles is a web proxy (HTTP Proxy / HTTP Monitor) that runs on your own computer. Your web browser (or any other Internet application) is then configured to access the Internet through Charles, and Charles is then able to record and display for you all of the data that is sent and received.

API Blueprint and Charles belong to "API Tools" category of the tech stack.

API Blueprint is an open source tool with 7.52K GitHub stars and 2.07K GitHub forks. Here's a link to API Blueprint's open source repository on GitHub.