GreenCheck
Scanning & ingredients

Scanning a barcode

Last updated: June 25, 2026

Point your camera at any product barcode and get an instant BEST / GOOD / CAUTION / AVOID verdict for each of your children.

In this article
OverviewOpen the scannerScan the barcodeRead the resultIf a barcode won’t scan

Overview

Scanning is the fastest way to check a product. GreenCheck reads the barcode, looks the item up, analyzes its ingredients, and grades it against every child you’ve added — all in a few seconds.

Open the scanner

  1. 1
    Tap “Scan a product”
    From the Home screen, tap the green Scan a product button, or the center Scan button in the tab bar.
    GreenCheck Home screen with the Scan a product button
    The Home screen — tap “Scan a product”.
  2. 2
    Choose which kids
    At the top of Home, tap a child’s avatar to scan just for them, or leave All kids selected to score for everyone at once.
  3. 3
    Allow camera access
    The first time, GreenCheck asks for permission to use the camera. Tap Allow. You can change this later in your phone’s Settings.

Scan the barcode

  1. 1
    Stay on the Barcode tab
    Make sure Barcode is selected at the top of the scanner.
  2. 2
    Line up the barcode
    Hold your phone steady and center the barcode inside the frame. Scanning is automatic — there’s no button to press.
    Scanner screen in barcode mode with the reticle
    Center the barcode; GreenCheck reads it automatically.
  3. 3
    Wait for the green check
    When the code is read, the frame turns green and you’ll see “Barcode found.”
Tip: in dim light, tap the screen to focus, or move a little closer. Glossy or curved packaging can take an extra second.

Read the result

GreenCheck looks the product up and checks its ingredients for each child.

Analyzing screen with a spinner
GreenCheck analyzes the ingredients for each child.

Then you’ll see a result card with a grade for every child.

Result screen showing a per-child grade for each child
Each child gets their own BEST / GOOD / CAUTION / AVOID grade.

Want to know how the grade is decided? See How scoring happens.

If a barcode won’t scan

GreenCheck is a helper, not a guarantee. Always read the product label before giving a product to your child. See our Medical Disclaimer.