Forests do it. Oceans do it. No major company does it yet.
Because the planet doesn't grade on a curve.
SINK — the Sustainability Index for Networked Knowledge — scores every company 0–100 using the same open formula. One rubric. Public data. Open to community challenge. No company can pay to change their score.
We're building the world's largest open database of real sustainability scores. Every score is sourced. Every score can be challenged. Every score is transparent.
The agencies use secret methodologies. The results are paywalled behind enterprise contracts that cost tens of thousands of pounds per year.
The result? ExxonMobil can receive an “A” rating from one agency and a “below average” from another — for the same year of operations. Consumers, journalists, and small investors have no way to know what's real.
SINK is the alternative: one formula, public data, open methodology. The same rules for a two-person startup as for a multi-billion-dollar tech giant — because transparency shouldn't scale with power.
What we measure. Real environmental footprint — emissions, energy, supply chain, governance.
How we measure it. One formula, scored 0–100, applied equally to every company on Earth.
Open to community challenge. Every score can be disputed with evidence. Transparency by design.
Data-driven. Every score backed by sources. No opinions, no vibes — just evidence.
A 10-person lighting company is scored using the same 10 questions as a $400B tech giant. The formula adjusts for industry and scale — the standards don't.
Every step of how we calculate a score is public. The formula, the rubric, the sources, the editorial reasoning. You can reproduce our scores from public data using our published methodology. No private weighting, no hidden logic, no proprietary tricks.
Every question on every score can be challenged by anyone with evidence. Challenges are reviewed and published. We'd rather be corrected than wrong.
Scores above 75 are exceptionally rare. We don't inflate grades to make companies feel good. A score of 60+ is genuine leadership — the kind backed by verified data, science-based targets, and transparent governance.
No investor, sponsor, or rated company has any say in how scores are calculated. Rated companies can pay for an Enhanced Assessment — a fee that buys reviewer time, never the outcome — and any company can challenge any score for free. We are not affiliated with or influenced by any company in our database.
We believe sustainability data should be free, transparent, and open to scrutiny — not locked behind enterprise paywalls or controlled by the companies being rated.
If you want to get in touch, challenge a score, or suggest a company to add, email us at hello@sinkproject.com.
Search the leaderboard. Challenge a score. Or back the project so it stays independent.