utilzilla.

Contract Review

Review changes between two OpenAPI contracts.

Compare OpenAPI 3.0 documents and inspect breaking, nonbreaking, and unclassified changes.

Running this tool sends your inputs to UtilZilla on Vercel for this check. Inputs are not saved by the tool. Do not submit secrets or payment-card data.

OpenAPI 3.0 only · JSON or YAML · 512 KiB per specification · internal references only.

Found this useful? Share it

X LinkedIn Reddit WhatsApp

About Contract Review

Contract Review sends the two specifications to UtilZilla only when you run the comparison. It uses a bounded OpenAPI diff and adds limited parameter-change checks. Unsupported semantics can remain unclassified, so the result is not a compatibility guarantee.

Frequently Asked Questions

When you run a check or request a calendar file. Inputs are sent to the UtilZilla server for that request and are not saved by this tool.

OpenAPI 3.0 only · JSON or YAML · 512 KiB per specification · internal references only.