Shopping list app?

[FusionChefGeoff]

Looking for something DH and I can share across platforms so android and iOS and that also has a 'favourites' list for stuff that you always need - anyone got any recommendations or ideas???

We use 'Out of Milk' which we've found to be really handy but me and DP are both on android - i have no idea if its available on iOS or if it works across platforms ('tho id be surprised if it didnt)