Schema Regression Watchdog
Diffs per-page structured data between two crawl snapshots — every disappeared schema type or completeness drop, quoted with evidence.
How this engine reports
- Measured evidence — labelled on every number, never dressed up as more certain than it is.
- Works with pasted answers — no API keys required.
- Uses site-crawl data.
- Every rate ships with its sample size and a 95% confidence interval; results below n=3 are flagged low-confidence.