Online shopping has trained us to expect price transparency . Before buying a laptop, pair of headphones, or household item online, we can open several tabs, compare sellers, review price history, and decide whether a deal is actually good. In a physical store, that visibility largely disappears. We see one shelf price, at one location, at one moment—and usually make a decision without knowing what nearby shoppers paid for the same product. That gap is why I built CartLens: an AI receipt s...