What a food scanner app actually does
You point your phone at a product's barcode, and the app looks it up in a database to show what's inside: the ingredients, the nutrition, often a health score, and sometimes allergen or additive warnings. It turns the small print on the back of a packet into something you can read in seconds, so you can compare two products on the shelf without decoding either label.
An app is only as good as its database and its scoring method, and both vary a lot. Some run on an open, community-built database; some on a proprietary one; some are built for US shelves and miss many UK products.
Focused on one job? We've got dedicated guides to using Scrannr as a UK food health scanner and as a processed food scanner.
UK coverage
Does it actually recognise UK products, including supermarket own-brands? Many US apps don't.
Data source
Where the facts come from: an open database, a proprietary one, or crowdsourced entries.
Scoring
Whether it turns a label into a score, how it does it, and how transparent that method is.
Price
Free, freemium, or subscription, and whether the barcode scanner itself is paywalled.
Privacy
Whether it needs an account, tracks you across apps, or keeps your data on your device.
An honesty note. No scanner app replaces professional advice. Health scores help you compare products at a glance. They are not a medical verdict, and allergen data can be incomplete, so read the label if you have an allergy.