A second look.
Not a sign-off.

Purpose and status

DiffHaven is an experimental browser-local tool for reviewing selected changes between OpenAPI JSON documents. It is offered as a prototype, without accounts, paid plans, service-level commitments or claims of complete compatibility checking.

Keep your own review

Findings, severity labels and suggested tests are guidance, not a guarantee of correctness, security or compatibility. Unsupported features can hide important changes. You remain responsible for validating your specifications, running tests, checking actual consumer impact and deciding whether to release.

“No findings” must not be treated as a release approval. Suggested test checkboxes do not execute tests. Explanations and suggested tests come from deterministic rules, not an AI service.

Use documents you may inspect

Only open documents you are authorized to use. Do not use the tool to infringe rights or expose confidential information. Your inputs are processed locally, but downloaded reports can contain sensitive source evidence; you control how those files are stored and shared.

No warranty or service promise

The prototype is provided as available, with possible defects, missing checks and interruptions. To the extent permitted by applicable law, no warranty of fitness, completeness or uninterrupted availability is offered. These notes do not exclude rights or remedies that applicable law does not allow to be excluded.

Changes to the prototype

Features and coverage may change. The product direction is better deterministic checks and clearer local reviews, with no in-product AI integration planned. Development-assistance plans are not product features or delivery commitments. Read the current coverage notes and privacy notes before relying on the tool.