I tried the app out a few months ago. Good idea, but at the time it was basing product availability on the chain rather than the store - i.e. it would tell you that any product available at the larger Countdown's was available at all the smaller Countdowns, which is very definitely not the case. I'm assuming that's the sort of thing they'd need help from the supermarket chains to fix.
It did not.
As I say, it was a few months ago, it may have been updated. At the time though, I could select a store and it appeared to populate from a single inventory for the relevant chain.
Still, fingers crossed that gets/got fixed, the idea of the app is good.
That's weird. If I for example select a bunch of countdowns, I get different availability per store. So it seems to work to some extent. Maybe it's an issue with countdown's site?