Observed arrival · 2026-08-31
DiffiCat, the migration break detector
A free website-migration tester that compares source and target sites for missing pages, content drift, and visual regressions.
Field notes
DiffiCat accepts a source site and target site, then checks HTTP responses, redirect behavior, selected metadata and body text, and full-page screenshots. Its stated limits include up to 10,000 pages per run and viewport widths from 320 to 2560 pixels. Content matching uses a 90% word-overlap threshold, while visual matching defaults to a 0% difference threshold. Reports include word-level changes, side-by-side screenshots, and indicators identifying whether Site A or Site B produced a failure.
Observed signals
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Editorial observations of this landing page, not a rating.
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