Scoring methodology · Materials
Every material product is evaluated against 4 rules, worth a total of 100 points. Your score is the percentage of points the product earns on what we actually know about it.
Quality score
Each rule contributes points up to a known maximum. We sum them, divide by the total possible, and that's the headline number on the product.
Unknowns
If we couldn't verify an attribute, that rule earns zero. Brands aren't rewarded for non-disclosure, and we don't fill the gap with a guess.
clean_ingredients
No harmful component materials or coating chemicals flagged. Scored against the personal-care / topical hazard database (NOT food per-serving) so substances like PFAS coatings, lead glaze, BPA, formaldehyde finishes, and azo dyes register as ingredient-level penalties.
lab_indexed
A third-party lab report has been indexed (heavy-metal leach test, PFAS extraction, formaldehyde release).
packaging
Dominant container / construction material. Glass / stainless / borosilicate score at the top; PET / polystyrene / generic plastic at the bottom. For cookware and drinkware this doubles as the primary "what touches your food/skin" signal.
recognized_certifications
Recognized material-safety third-party certifications: OEKO-TEX / GOTS (textiles), NSF/ANSI 51/61/372 (food-contact materials), Cradle to Cradle, LFGB, Bluesign, plus explicit free-from claims (lead-free, PFAS-free, BPA-free, phthalate-free).
Scoring is a function applied to evidence. If you think a rule fired on the wrong evidence, the per-product breakdown shows the source for every contribution — each one is challengeable. The methodology itself is version-controlled and evolves in public.
