Very little data available in the UK. Needs a longer free period.
Except that it's not (in the UK, at least). A three day free trial is enough to use it on a single shop, and I scanned a couple of dozen items.
I found no items with developer provided information. So I don't know what that looks like, and can't assess the quality of their information.
I found two items with crowdsourced information, and those had only a couple of votes each. One, containing honey, had a "yes" and a "no".
I made a few votes myself, so spent more time on my shop that otherwise. And I learned exactly nothing from the app.
Give people a longer free trial, or lower subscription prices, and perhaps they'll upload more data and make the app useful.