API Design: best apps and software

SwaggerHub

SwaggerHub is a platform for API design, development, and documentation, providing tools for collaboration, testing, and maintenance throughout the API lifecycle.

Stoplight

Stoplight is a platform for designing, testing, and documenting APIs, enabling teams to streamline API development and ensure consistent quality.

Apidog

Apidog is a platform for API design and management, offering tools for documentation, testing, and collaboration across development teams.

Bump.sh

Bump.sh centralizes, validates, and updates API documentation, enabling easy comparison and collaboration for developers and product managers.

Redocly

Redocly creates and manages interactive API documentation, supporting OpenAPI definitions and versioning for easy updates and accurate management.

ReAPI

ReAPI simplifies API documentation and testing with a user-friendly editor, AI assistance, and integrated tools for collaboration and management.

Conektto

Conektto is an AI-powered platform that simplifies API design, testing, and deployment for developers and teams, enhancing collaboration and efficiency.

Mockaron

Mockaron is a free online tool for creating mock APIs with customizable JSON responses, enhancing front-end development, testing, and prototyping.

Mockfly

Mockfly is a cloud platform for developers to create and manage mock APIs, offering collaborative features, multiple responses, and automatic documentation.

Mocklets

Mocklets is an HTTP-based mock API simulator that allows developers to create simulated APIs for testing and development without needing a live backend.

Ambassador Blackbird

Ambassador Blackbird is an API management tool that helps developers create, test, mock, and deploy APIs efficiently in a streamlined environment.

Octri

Octri turns API specifications into documentation, SDKs, and an MCP server, and provides tools to monitor API performance and errors.

Elva

Elva discovers, documents, tests, and governs APIs from source code, then publishes them for developers and AI agents with access controls and usage monitoring.

Routebase

Routebase manages OpenAPI specifications for designing, mocking, testing, documenting, and monitoring APIs, with CI support, change reviews, and AI-assisted workflows.

Zunoy MockAPI

A web-based tool for creating mock REST APIs with custom responses, status codes, delays, and CORS settings for testing and development.

Contractr

Contractr is a contract-first API tool for defining API schemas, creating instant mock servers, and sharing live endpoints for testing and collaboration.