A manufacturer does not have to write “sugar” as its own line if it was added as syrup, molasses or concentrate. Formally these are different ingredients. In practice they are the same thing.
The names it hides behind
Glucose-fructose syrup, maltodextrin, dextrose, apple juice concentrate, honey, molasses, caramel syrup. Listed separately, each weighs less than sugar would as a single line — and each slides further down the list.
So a product with sugar in fifth place can contain more of it than one with sugar in second.
Where the honest number is
The nutrition table, the line reading “of which sugars”. It counts every simple carbohydrate together, however many names they go by in the ingredients.
The rule of thumb: more than 22.5 g per 100 g is a lot, under 5 g is a little. For drinks the thresholds are lower — 11.25 g and 2.5 g per 100 ml.
What the scanner does
Foodstr adds up every form of sugar in the ingredients and shows it beside the figure from the nutrition table — so you can see not only how much there is, but in how many guises it got there.