For your business
You got the form. Answer it yourself.
Upload your bills, get your CO₂ report and paste-ready answers. No expert, no consultant — free to start.
Start freeCarbon accounting software
Work out your business's CO₂ from the bills you already have.
Running a business is hard enough. Carbon reporting shouldn't add to it.
Upload your electricity, gas, fuel and delivery bills. Our AI reads them, a plain calculator works out your carbon dioxide (CO₂) using published, versioned emission factors, and you get a clear report with proof behind every figure — ready for whoever asks.
Already been sent a carbon questionnaire by a customer? We'll explain it, free →
No science team needed. Paying someone to do this by hand costs €5,000+.
Helps you answer the carbon questionnaires customers send
CDP
EcoVadis
Your customer's own spreadsheet
Any custom supplier form
Who's it for?
For accountants & bookkeepers
Handle it for all your clients.
One login, every client in their own workspace. Answer their climate forms the way you already do their books.
See partner accessHow it works, step by step.
From a pile of bills to a finished answer — in four steps.
1
Upload your bills
Drag in your electricity, gas, fuel and delivery bills — any format, any language. No typing anything into a spreadsheet.
2
We read them for you
The AI pulls out the numbers that matter — like how much electricity or fuel you used — and shows how sure it is about each one.
3
We do the math
A plain calculator (not AI) turns those numbers into your total CO₂, using published, versioned emission factors (DEFRA, Ember). The AI never makes a number up.
4
You get your answers
Answers ready to paste into your customer's form — plus a receipt for every number showing exactly which bill it came from.
This is what you actually get.
A clear report with your CO₂ split by source, and a receipt behind every single number.
Your CO₂ report · 2025
Where it comes from
- Fuel burned (Scope 1)67%
- Electricity (Scope 2)28%
- Deliveries & travel (Scope 3)5%
Total
12.83 t CO₂
| What | Math | From |
|---|---|---|
| Electricity | 10,000 kWh × 0.36292 = 3.63 t | strom.pdf |
| Diesel | 3,410 l × 2.51233 = 8.57 t | fleet.pdf |
| Natural gas | 15,200 kWh × 0.18293 = 2.78 t | gas.pdf |
Click any number in the app to see its bill and the exact page.
Proof for every number
Every number shows its receipt.
Click any number in your report and see exactly how we got it: the bill it came from, the page, and the simple math. So when your customer's checker asks “where did this come from?”, you have a real answer — not a shrug.
Anything we're unsure about gets set aside for a human to check before it goes in your report. Best guesses are always labelled as guesses.
One line from your report · fuel
3,410 litres of diesel × 2.51 kg CO₂ each
= 8.57 tonnes of CO₂
official number → UK government (DEFRA), 2024
came from → fleet-diesel-q1.pdf, page 2
how sure → 94% · accepted automatically
Free while we launch.
Paying a consultant to do this by hand costs €5,000–20,000 and takes weeks. Right now, CarbonProxy is free — the whole thing — with a small cap on uploads. Need more? Pick a plan inside your account and we'll set it up for you.
Free
Start hereFree
up to 30 documents · no card
The whole product, free: your full CO₂ report, the proof behind every number, and the shareable PDF. Up to 30 documents per account while we're in launch.
Start freeStarter
Monthly
a set number of docs each month
Keep one business reporting-ready all year: a monthly plan with enough documents for your bills as they come in.
Start freeUnlimited
Monthly
upload as much as you like
For businesses with lots of bills or several sites — no cap on uploads, every year.
Start freePartner
Monthly
for accountants
One login to handle many clients, each in their own workspace — for accountants and bookkeepers doing this on behalf of the businesses they serve.
Start freeBuilt to be trusted with your business data.
Your bills stay in the EU
Your documents are kept on servers in the EU, separate from every other company, and deleted whenever you ask. They are never used to train AI.
AI reads, a calculator does the math
The AI only reads your documents. Every CO₂ number is worked out by a plain calculator you can check — so the AI can't make one up.
No fake 'green' claims
We give you honest estimates for your customer's form, clearly labelled with how they were worked out. We will never stick a 'carbon neutral' badge on anything.
Ready to be checked
The proof behind every number — the bill, the page, the math — comes with every report, so you can stand behind your numbers without us in the room.
Fair questions.
Nobody here knows about this stuff. Can we still do it?+
Yes — that's the whole point. If you can find your electricity, gas, fuel and delivery bills, we handle the rest: reading them, doing the math, and putting the answers in the shape your customer's form wants.
Can the numbers be trusted?+
They're honest estimates worked out with published, versioned emission factors, and every figure links back to the exact bill it came from. They're not a formal audit — if your customer needs one of those, we'll point you to a partner who does it.
Our bills are in German / French / Italian…+
No problem. It reads documents in any EU language.
What if my customer uses their own weird spreadsheet?+
That's the most common case, and the one we handle best — a spreadsheet is the one thing we can hand straight back to you already filled in. For online forms like CDP (where there's no file to hand back), you get every answer lined up and ready to paste.
What happens to our data?+
Kept in the EU, separate from every other company, deleted whenever you ask, and never used to train AI. Bills show your costs and suppliers, so we treat them carefully.
Find out your number. It takes minutes.
Make a free account, upload a few bills, and see your CO₂ with proof behind every figure. 30 documents free — no card needed.
Get your CO₂ report — freeBeen sent a carbon questionnaire by a customer? We'll explain it, free →