Zach Yadegari is the founder of Cal AI, a nutrition-tracking startup that uses computer vision to make logging meals as simple as taking a photo. While still in high school, he combined aggressive viral marketing with a lean product to grow the app from zero to $1M ARR in under 30 days and reach a $12M ARR run rate. His journey highlights how a single founder with strong distribution instincts can outpace larger, slower teams.