Groceries Price Comparison App Shopjam [Android]
might also have an iOS version but don't have a device to check
Not associated but my partner found this app recently and while only covering woolworth, coles, and chemist warehouse? it could be useful, a few of the review comments mention some delay during the specials change over so be warned.
only played with it for a day or so but seems to be fairly good.
if anyone knows more or a better app I'm interested (i did just grab unocart to check as well)