Compare OpenAPI changes before they reach production.
API Contract Guard gives teams a free OpenAPI diff tool for quick checks and a GitHub App for enforcing the same compatibility result on every pull request.
Paste two specifications
Compare a baseline OpenAPI document with a proposed JSON or YAML version and see the removed paths, responses, parameters and schemas.
Review the breaking changes
The report focuses on changes that can break existing API consumers, rather than burying the decision inside a generic text diff.
Move the check into GitHub
When the manual check becomes part of your release process, install the GitHub App and make the compatibility result a required pull-request status.
Protect every pull request automatically
Install the GitHub App, choose a repository and get a clear pass or fail status whenever its OpenAPI contract changes.
Frequently asked questions
Can I use it without installing anything?
Yes. The browser checker can compare OpenAPI YAML or JSON files without a GitHub installation.
What does the automated version do?
The GitHub App watches pull requests, compares changed OpenAPI files against the base branch and publishes a native GitHub Check.
Does API Contract Guard store my OpenAPI files?
OpenAPI file contents are fetched for analysis and are not stored as long-term product records.