Which products are in the database?

We use Open Food Facts (open source, ~3 million products) plus our own trigger annotations. Coverage is excellent in EU/UK and growing in US.

What if a product isn't found?

You can add it manually - it then becomes available to other users too. Crowd-sourcing makes the database better every day.

Does it know my personal triggers?

Yes. Once you've used the app for a few weeks, your personal triggers (from Insights) are highlighted automatically when you scan.

Does it work offline?

The most-scanned 100,000 products are cached on your device, so the scanner works even in poor signal areas.

Know what you're eating, before you eat it

Scan the barcode. Read your gut's verdict.

Supermarket lights are bright, food labels are tiny, and ingredient lists hide things like inulin, sorbitol and 'natural flavour'. A Gut Day scans the barcode and shows you everything that matters in one screen.

Try the scanner - free What it shows

Reading food labels shouldn't be a science exam

Modern packaged food contains additives, sweeteners and stabilisers that didn't exist 20 years ago. Many of them - inulin, sorbitol, mannitol, carrageenan - are notorious gut irritants. A Gut Day's scanner reads the barcode, looks up the product in Open Food Facts and our trigger database, and tells you in plain language whether it's likely to upset your stomach.

How A Gut Day helps

Built for this exact problem

Open Food Facts database

Millions of European and global products, updated continuously.

Personal trigger flags

If onion gives you trouble, the scanner highlights it on every label.

Hidden FODMAPs surfaced

Inulin, chicory root, fructans, polyols - clearly labelled.

Allergen highlights

Gluten, lactose, soy, nuts, eggs - colour-coded at a glance.

One-tap to log

Like the product? Add it to today's meals with a single tap.

Works in any supermarket

Albert Heijn, Jumbo, Tesco, Sainsbury's, Carrefour, Edeka - if it has a barcode, we read it.

How the scanner works

1
Open the scanner
One tap from the home screen - camera opens immediately.
2
Point at the barcode
Auto-focus catches it in under a second.
3
See the verdict
Ingredients, allergens, your personal triggers - all on one screen.
4
Log it (or skip it)
Add to your diary with one tap, or put the product back on the shelf.

Frequently asked questions

Which products are in the database?: We use Open Food Facts (open source, ~3 million products) plus our own trigger annotations. Coverage is excellent in EU/UK and growing in US.
What if a product isn't found?: You can add it manually - it then becomes available to other users too. Crowd-sourcing makes the database better every day.
Does it know my personal triggers?: Yes. Once you've used the app for a few weeks, your personal triggers (from Insights) are highlighted automatically when you scan.
Does it work offline?: The most-scanned 100,000 products are cached on your device, so the scanner works even in poor signal areas.

Make smarter supermarket choices in seconds.

Free to use on every plan. No more squinting at tiny ingredient lists.

Start scanning free