API Blueprint vs StopLight: What are the differences?

API Blueprint: 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; StopLight: Visual API Tooling. Stop writing thousands of lines of specification code. Our intuitive visual editors significantly cut down on design time, and are spec agnostic. Generate OAI (Swagger) and RAML specification code on demand.

API Blueprint and StopLight can be primarily classified as "API" tools.

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.