0.6×
Product
Materials · Transport · Completeness
GreenStar is an estimate, not an audit. Scores come from public sustainability reports, financial filings, and other reputable public sources. This page is the full scoring logic, including the exact weights we apply.
Product signals get the larger share because they reflect what you're actually buying. Brand performance modulates, so a good product from a weak brand doesn't score the same as one from a brand doing the work.
The 60/40 split and the 7-component weights aren't pulled from a regression. They're informed-judgement calibrations designed by our founding sustainability specialist (who works in commodity ESG ratings at S&P Global) and our founder (formerly Morgan Stanley, Fixed Income ESG Strategy & Research).
We believe opinionated-and-published beats black-box-and-hidden. If an expert disagrees with a specific weight, we'd genuinely like to hear it. Post-MVP, we'll empirically calibrate against expert panels and observed behavioural data, and publish the update.
See the calibration methodEach component is scored out of 5. The brand score is the equally weighted average of all seven. No single category can dominate.
A brand that discloses 92% of the relevant fields shouldn't score the same as one that discloses 42%. Opacity lowers both the score and the visual confidence of the rating shown on the product page.
At 100% disclosure, the full raw score is awarded. At 50% disclosure, the score is multiplied by 0.75. At 0% disclosure, the raw score is halved. The visual star rating fades accordingly.
All data is public and auditable. We don't use proprietary black-box feeds or paid partnerships that could bias the scoring. If you can't independently verify a claim, we don't score it.
GRI-referenced, TCFD-aligned, published annually. Pulled directly from brand investor-relations pages.
Where sustainability is material to the business, financial filings are now required to disclose it. A rich and reliable second source.
Public registries from GOTS, OEKO-TEX, Bluesign, Fair Trade, B-Corp, Cradle to Cradle. Auto-verified. No self-reporting.
Independent incident databases tracking labour violations, safety failures, and enforcement actions across the sector.
Target progress, validation status, and pathway alignment. Public, audited, with clearly documented methodology.
Real-time, pulled by the extension: materials, origin, care labels, price, sustainability claims. The consumer half of the equation.