Carbon receipts: see the CO₂ footprint of every purchase

People want to cut their footprint but have no idea which purchases matter. Is the weekly beef order worse than one flight? Most carbon calculators ask you to fill in a long survey once and never again.

Carbon Receipts connects to your bank or card (open banking in the EU and UK) and estimates the CO₂ of every transaction using merchant categories and public emissions data. A weekly summary shows your three biggest sources and one realistic swap.

Revenue: free for individuals; banks and neobanks license it as a white-label feature, and employers buy it for staff sustainability programmes.

Looking for a backend developer with open-banking experience and someone who understands emissions-factor data and its limits.

This is a starter idea from the UnbuiltHub team. Nobody owns it: if you'd like to build it, share your own version and find your team here.