OpenAPI Diff Tool — Evolution Inspector
Compare two OpenAPI or Swagger specs and classify breaking vs non-breaking changes. Free OpenAPI diff and API evolution inspector by Graph Tools.
Use this free OpenAPI diff tool to upload two OpenAPI 3.x or Swagger 2.0 specifications and get a detailed breakdown of every change. Each difference is classified as breaking, non-breaking, or stylistic, covering endpoints, parameters, schemas, security schemes, and response shapes. Supports both JSON and YAML formats. Ideal for release reviews, CI pipeline gates, and API governance workflows.