OpenAPI Specification vs RAML: What are the differences?

Developers describe OpenAPI Specification as "An API description format for REST APIs". It defines a standard, language-agnostic interface to RESTful APIs which allows both humans and computers to discover and understand the capabilities of the service without access to source code, documentation, or through network traffic inspection. On the other hand, RAML is detailed as "RESTful API Modeling Language (RAML) makes it easy to manage the whole API lifecycle from design to sharing". RESTful API Modeling Language (RAML) makes it easy to manage the whole API lifecycle from design to sharing. It's concise - you only write what you need to define - and reusable. It is machine readable API design that is actually human friendly.

OpenAPI Specification and RAML can be categorized as "API" tools.

According to the StackShare community, OpenAPI Specification has a broader approval, being mentioned in 22 company stacks & 8 developers stacks; compared to RAML, which is listed in 9 company stacks and 6 developer stacks.