OpenAPI-diff

Name: OpenAPI-diff
Author: OpenAPITools

A command-line tool that compares OpenAPI specifications and renders their differences in several formats.

By OpenAPITools

Free Open sourceCommand line

Official websitegithub.com

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About OpenAPI-diff

OpenAPI-diff compares OpenAPI 3.x specifications and can render differences as HTML, plain text, Markdown, Asciidoc, or JSON. It reads specifications from JSON files or HTTP URLs and examines changes to parameters, responses, endpoints, and HTTP methods.

The project also offers a Maven plugin that can report API changes during a build and optionally fail when it finds a compatibility break.

Strengths

Renders differences in HTML, text, Markdown, Asciidoc, and JSON
Reads specifications from local JSON files or HTTP URLs
Includes a Maven plugin for build checks

Limitations

Requires Java 8.
Supports OpenAPI specification v3.0.

Details

Pricing: FreeFree and open source under the Apache-2.0 license.
License: Apache-2.0
Developer: OpenAPITools
Platforms: Command line
How it runs: Downloadable app
Best suited for: API developers checking changes between OpenAPI specifications
Categories: API clients, Developer tools
Last verified: October 8, 2026
Added: October 8, 2026
Provenance: Selected from the Homebrew formula
Sources: github.com/OpenAPITools/openapi-diff

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