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OpenAPI-diffoasdiff

Best for: API developers checking changes between OpenAPI specifications

Best for: API developers reviewing specification changes locally or in CI

Free

Free and open source under the Apache-2.0 license.

 Free + paid options

The CLI and GitHub Action checks are free; Pro adds approval workflows and an audit trail for $100…

Full pricing details

The CLI and GitHub Action checks are free; Pro adds approval workflows and an audit trail for $100 per month.

Command line Windows, macOS, Linux, Command line
  • Renders differences in HTML, text, Markdown, Asciidoc, and JSON
  • Reads specifications from local JSON files or HTTP URLs
All 3 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
  • Detects breaking and non-breaking changes across OpenAPI specifications
  • Generates human-readable changelogs and structured diffs
All 3 strengths
  • Detects breaking and non-breaking changes across OpenAPI specifications
  • Generates human-readable changelogs and structured diffs
  • Provides GitHub Actions for CI checks
  • Requires Java 8.
  • Supports OpenAPI specification v3.0.
  • Review links store encrypted comparison data for up to seven days.
Downloadable app Downloadable app
Open source Open source
License: Apache-2.0 License: Apache-2.0
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline
Sources

Catalog checked October 8, 2026
Sources

Catalog checked October 6, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.