19-Year-Old Sold His AI App for $30M at 19: Now He's Trying To Break Gen Z's Worst Habit

Zach Yadegari, who sold Cal AI to MyFitnessPal, now targets Gen Z's morning phone habit with his new brand, Flow. (Credit: YT/ Zach Yadegari)

Zach Yadegari was 19 and halfway through his first year at university when he sold the calorie-tracking app that had made him a millionaire. He gave himself almost no time off before starting again, this time aiming at a habit familiar to most of his generation: doomscrolling.

The teenager from Long Island, New York, co-founded Cal AI in high school with his friend Henry Langmack and grew it into a business turning over around $30 million (£22.5 million) a year. Fitness platform MyFitnessPal bought the app in December 2025, Business Insider reported, on terms that were not disclosed. Cal AI, launched in May 2024, passed 10 million users, logging meals from a single photo rather than manual entry.