An app supported by the government is designed to make it easier to stay healthy, by letting you know exactly what is in your food.
Eating and drinking too much sugar can be bad for your health, but sometimes it's tricky to know exactly how much sugar is in the food we buy.
So now an app supported by the government in England, has been launched to help you work out what's in your food. You scan the item's barcode and it should tell you the amount of sugar in it.
Ricky went to meet some kids who have been keeping a close eye on what they eat.