Scanner apps work by reading barcodes and matching against databases. They can miss cross-contamination risks, manufacturing changes, or products not yet in their system.
Treat them as a first pass — never a final answer.
Tool
Product scanner tips.
Ingredient scanners are useful — but never the whole story. Here's how to use them well, and what to verify yourself.
Why they matter
Helpful tools — not foolproof.
Best practices
Use them properly.
- 01.
Always read the physical label too
Apps can be outdated or miss recent recipe changes. The label is the legal source of truth.
- 02.
Check for "may contain" warnings
Many scanners focus on ingredients but miss cross-contamination warnings, which are just as important.
- 03.
Verify manufacturing information
Products can be reformulated. Check the date and batch code if the app shows it's been a while since the last scan.
- 04.
Use multiple sources
If an app says a product is safe but you're unsure, cross-reference with the manufacturer's website or call them directly.
- 05.
Report errors
If you find incorrect information, report it to the developers. This helps keep the database accurate for everyone.
Blind spots
What scanners can't tell you.
- Cross-contamination risks from shared production lines.
- Recent recipe changes that haven't been updated in the database.
- Regional variations in ingredients (same product, different country).
- Manufacturing facility changes that affect cross-contamination risk.
- Processing methods that aren't always listed — alcohol filtered through almond shells (e.g. Bombay Sapphire gin), wine finings using fish-derived products like isinglass, or pet food containing peanut butter/lupin (e.g. THE PACK No-Fishy Dishy).
Apps to research
Some options.
No endorsements — research what fits your needs.
Spoon Guru
UK-focused with detailed allergen information.
Fig
Allows customisation of dietary restrictions.
Open Food Facts
Open-source database with community contributions.
Always verify app information with the product label and manufacturer when in doubt.
The bottom line
Scanners are useful tools but should complement, not replace, careful label reading and manufacturer verification. With severe allergies, there's no substitute for reading the actual product label and, when necessary, contacting the manufacturer.