Shop demo, fictional product. A brand supplies its own before/after photos; the shop page shows how much of the visible change is beyond measurement noise. The badge describes score measurements. It is not a claim about the product. Photos: CC0 portrait with simulated edits, see credits.

Demo Serum 30 ml (fictional)

$29.00

Measurement details (12 YouCam Skin Analysis scores)

Embed it (about 10 lines)

import { judge, summarize } from './verdict.js';   // pure function, no dependencies
// before / after: two YouCam raw_score maps each (two retakes per time point)
const rows = judge(before, after);                   // per-concern verdict + noise + threshold
const beyond = rows.filter(r => r.verdict === 'improved' || r.verdict === 'worse').length;
badge.textContent = beyond ? beyond + ' of ' + rows.length + ' scores moved beyond noise'
                           : 'No clear change beyond measurement noise';

Cost per badge: 4 photos, about 56 units at the 14 units per photo we measured (see README); the brand pays once per before/after set, not per shopper.