Observed arrival · 2026-09-17
Per Gram, a carbon calculator for protein shopping
Per Gram estimates the carbon cost of protein purchases by scanning products, reading receipts, and comparing sources per 100 grams of protein.
Field notes
The app compares protein sources using kilograms of CO₂e per 100 grams of protein, then lets users record quantities in several units. Its receipt workflow is unusually explicit: the parser exposes raw vision text, word positions, rebuilt rows, and lines it dropped, while the page says typed quantities remain unverified. The methodology cites Poore & Nemecek (2018), Open Food Facts, and an economic allocation rule for splitting footprints between whey and cheese.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
One card from the complete issue