How accurate are GroceryChef's grocery prices?

GroceryChef's prices are estimates, and the app labels them as estimates everywhere. They are meant to help you compare stores and stay near a budget, not to promise an exact receipt total, because real prices change by location, week, and sale. In practice the estimate gets you close and the comparison between stores is the most useful part, since the relative gap tends to hold even when the exact number shifts. We would rather show an honest estimate than a fake precise price.