For most companies, the biggest part of the footprint is what they buy. Paste your suppliers to see the ones we've already scored, right now. We'll check the rest from public evidence and send you a report you can show a customer, an assessor or your board, in 48 hours.
First 5 suppliers free · Full checks from £495 · No questionnaires for your suppliers
Tenders, certifications like B Corp, and your own Scope 3 targets all ask the same thing: what are you doing about the emissions in what you buy? The usual routes are slow or expensive: questionnaires take months and let suppliers mark their own homework, consultants cost thousands, and most people doing this have another job too.
On average, a company's supply-chain emissions are 26 times bigger than the emissions from its own operations.
Only four in ten companies engage their suppliers on climate at all. The rest are working blind.
UK government contracts worth £5m a year or more need a carbon reduction plan that covers part of Scope 3. From April 2027, NHS contracts that size need all relevant Scope 3.
SINK is independent and not affiliated with B Lab or any certifier, buyer or regulator. The report is evidence you can use; whoever is assessing decides what counts.
Ten suppliers a typical UK office business might use, with their live scores and each one's biggest gap. Click any row to see the full breakdown and every source behind it.
View the full sample report →The five lowest scores on your list: the suppliers most worth following up first.
The report includes one of these for each supplier you want to chase, asking for its missing evidence. You decide whether to send it.
Hi,
As part of our work on supply-chain emissions, we've reviewed the public climate evidence for our main suppliers, including Unilever. The area where we couldn't find much was emissions not falling.
Could you show us how your emissions have changed over the last few years? Anything you can send in the next month would really help.
Thanks,
Live SINK scores as of 13 October 2026. The last row is an example of a supplier with nothing published, which is common for small firms.
Every supplier scored 0–100 on the same ten questions, from leading to no public evidence.
Add spend and we show where your money, and most of your footprint, actually goes.
Its weakest climate area, so you know exactly what to ask it about.
A short email for each supplier you want to chase, asking for the missing evidence. You decide whether to send it.
For a tender, a B Corp or other certification, or your Scope 3 workings. Every number links to its evidence.
We score your list again so you can show which suppliers moved.
You can do this yourself, chase questionnaires or hire help. Here's how they compare with a supplier check.
Many sustainability ratings rely on what companies say about themselves. SINK scores are built from public evidence, with every source shown. That's the whole reason a supplier check is worth having: a score means the same thing for every company on your list.
SINK is independent and UK-based. Your supplier list is used only for your report, never shared or published, and deleted on request. Questions: hello@sinkproject.com
Every score comes from publicly available evidence: reports, filings, certifications and independent investigations.
Emissions, supply chain, trajectory, targets, transparency and more. Published, with what each mark needs.
Each score links to the reports and filings behind it, so you can check our working.
Any company can challenge its score for free, in public, with evidence. Corrections are logged.
No subscription. Over 100 suppliers? Send it and we'll quote you first.
48 hours, or it's free. If a paid report is late, you get your money back and keep the report.
Rather talk first? hello@sinkproject.com
Start with what's public: annual and sustainability reports, emissions figures, targets, certifications and independent investigations. SINK does this for you, scoring each company 0–100 on the same ten climate and environmental questions. Paste your suppliers above to see the ones already scored; a supplier check scores the rest and ranks your whole list within 48 hours.
Scope 3 covers the emissions in your value chain, and for most companies the biggest part is what they buy. A supplier check shows which of your suppliers are measuring and cutting their emissions and which aren't, so you know where your Scope 3 risk sits and who to follow up.
No. SINK is independent and isn't affiliated with B Lab or any certifier, buyer or regulator. The report is evidence you can use in a certification, a tender or your own reporting; whoever is assessing decides what counts. What we can promise is that every score uses the same published method and shows its sources, so anyone can check it.
You can, and we'd encourage it. A supplier check is the version you'd hand to your board or put in a tender, a certification or a Scope 3 report: every supplier on your list matched to the right company and scored (including the ones we've never scored before), ranked in one place, weighted by your spend if you give it, with each supplier's biggest gap, and a follow-up email for each one you want to chase. Searching gets you one score at a time. A check gets you a decision.
Then the report says so plainly, and that's useful in itself: those are the suppliers to ask for a carbon reduction plan, and the report gives you the email to send. We never guess or estimate a score for a company with no public evidence.
Nothing is sent to them: no questionnaires, no forms. We work from public evidence only — annual and sustainability reports, filings, certifications and independent investigations. We never publish your list or link it to you.
Only with evidence. Every score is built from publicly available evidence and uses the same ten published questions, with every source shown. A supplier that thinks we've missed something can challenge its score for free, in public, and any change is logged.
Questionnaires ask suppliers to mark their own homework, take months to chase, and the suppliers with most to hide are the least likely to answer. A supplier check asks nothing of your suppliers and is back in 48 hours. Many teams use it to decide which suppliers to send a questionnaire to in the first place.
If your report isn't with you within 48 hours of payment, you get your money back in full and you keep the report.
Yes. After you send your list, choose "Send me an invoice" and we'll email one within one working day. The 48 hours start when it's paid.