Freemium
Apiary
Hosted platform to design, prototype, document and test APIs
Design and SDKsAPI design and docs platform
6 tools in our directory are marked as best for API designers, from 1 section: APIs (6).

Hosted platform to design, prototype, document and test APIs

Standard vocabulary for describing and validating JSON data

Open standard for describing HTTP APIs in a machine-readable way

Visual platform for designing, documenting and mocking OpenAPI

Open source tools for designing and documenting OpenAPI APIs

Code-first language to define APIs and emit OpenAPI or JSON Schema
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