How Best Price Alert decides between one store and a two-store split

Most grocery apps compare prices. Best Price Alert decides.

Every week we pull live per-item prices and weekly deals across Rewe, Aldi Süd, Lidl, and Edeka in Cologne, and answer one specific question: given exactly what's on your list, is it worth splitting this trip across two stores, or should you just go to one?

That sounds simple. It isn't, because the honest answer usually isn't "always split". It's a real tradeoff. A two-store split might save you €4.20 this week, but cost you an extra 12 minutes of driving. We show you both numbers, every time, and let you decide. No app tells you "go here" without also telling you what that decision costs you.

This is deliberate. Cashback apps ask you to prove a purchase and wait for a payout. Flyer apps show you deals but leave the comparison work to you. Best Price Alert does the comparison and shows its work, savings before the trip, nothing to dispute afterward.

If you already keep a mental list of "the cheap store" and "the good store," you're doing a simplified version of this by hand. We just do it with real numbers, every item, every week.