Yes, it's mainly for branded items (as they can be compared across shops).
I like the price tracker too, some surprises 😉
You don't have to register, if you have privacy worries,
but if you do, you can save your favourite items,
and the list can go to the shops web site, to buy the list.
It it's too fiddly on the mobile, you could use the normal web page on a computer.