Scan a barcode
Point your camera at the barcode on a food package, or type the number.
Looking for a barcode…
Scan a receipt
Take or choose a photo of a till receipt. Text recognition runs on your device — the image never leaves your phone.
Recognised text
History
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About Trace
Trace shows which substances of potential concern may be in a food product and how strong the evidence is, with links to the original sources.
Not medical advice. All substances listed are reviewed by regulators, and most are authorised in the EU at the levels used. A listing means there is a regulatory warning, restriction, classification or open scientific question — not that the product is unsafe. Product data comes from Open Food Facts (crowd-sourced) and can be incomplete or out of date; always check the package. Talk to a doctor or dietitian about your own diet.
Evidence levels
Substances we look for
Data & privacy
- Product data: Open Food Facts, available under the Open Database License (ODbL). Add missing products there to improve results for everyone.
- Our substance list is curated from EFSA opinions, EU regulations, IARC classifications and peer-reviewed studies. “Latest research” links open a live PubMed search.
- Receipt photos are processed in your browser with Tesseract.js. Only the product names you choose to search are sent to our server.
- History lives in your browser’s local storage. No accounts, no tracking.