Instead of focusing on multiple "real time" grocery lists, focus on figuring out what recipes someone often makes, what ingredients they have at home and do the hard work for them. That could be a winner.<p>I don't envision anyone doing their "meal planning" at the grocery store because they have to resolve the ingredient list with what they have at home.<p>But seriously, ditch the real time sharing stuff. I don't know why so many todo lists focus on that.
I'd like the app to check prices for me at a number of nearby stores so I can buy the stuff I always buy, but at the lowest prices. I've got about 3-4 stores that I visit pretty regularly, and I'm always trying to optimize on prices. Do that and I'll buy it (I'll get a smart phone too)!