Tool Ab Comparison
Category: Visual Testing · Tier: All
Compare two URLs visually (staging vs production)
When to Use
Visual testing in CBrowser uses Wasserstein optimal transport theory for robust comparison. Smart baselines compute the barycenter (optimal average) of multiple captures. Transport maps show where visual content moved. Attention analysis models persona-specific saliency.
Parameters
| Parameter | Type | Required | Description |
|---|---|---|---|
| urlA | string | Yes | First URL (e.g., staging) |
| urlB | string | Yes | Second URL (e.g., production) |
| labelA | string | No | Label for first URL |
| labelB | string | No | Label for second URL |
Example
Compare the old checkout flow with the new design
Tips
- Visual testing uses Wasserstein optimal transport for robust comparison
- Smart baselines handle non-deterministic rendering automatically
- Transport maps show WHERE content moved, not just THAT it changed
Research
- Klein & Frintrop (DAGM 2012) — W₂ saliency on CIE-Lab distributions
- Agueh & Carlier (SIAM 2011) — Barycenters in Wasserstein space
- Taylor & Fiebach (2025) — OT predicts neural activity at <225ms
Related
- Tools Overview — All 120 tools by category
- Visual & Performance Tools — Full visual testing docs