Photo calorie app Cal AI, downloaded over a million times, was built by two teenagers | TechCrunch

In a world filled with “vibe coding,” Zach Yadegari, teen founder of Cal AI, stands in ironic, old-fashioned contrast. 

Ironic because Yadegari and his co-founder, Henry Langmack, are both just 18 years old and recently graduated from high school. Yet their story, so far, is a classic.

Launched in May, Cal AI has generated over 5 million downloads in eight months, Yadegari says. Better still, he tells TechCrunch that the customer retention rate is over 30% and that the app…