Cal AI, a Photo-Based Calorie Tracker with Over a Million Downloads, Created by Teen Duo

Zach Yadegari and Henry Langmack, both 18, launched Cal AI, a calorie-tracking app, in May. It’s racked up over 5 million downloads and $2 million in revenue last month. Using AI models, it’s 90% accurate at logging food from photos. The teen founders met more coders, lived in a hacker house, but Zach still wants college.

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