LINKEDIN – Jake Kozloski, founder & CEO of Keeper, says physical attraction is the most important factor in matchmaking. Not shared values or compatibility frameworks. He argues this is backed by research and widely understood by matchmakers, but often avoided in product design. At Keeper, his team built a photo testing tool using millions of human ratings. They trained their own model, keeper-1, to score attractiveness with near-human accuracy, at a fraction of the cost of other AI models.