From Teen Coder to Multimillionaire: How an 18-Year-Old Built a $30M AI Nutrition App
Businessinsider.com•6 hours ago•
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From Teen Coder to Multimillionaire: How an 18-Year-Old Built a $30M AI Nutrition App

Young Entrepreneurs
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Summary:

  • 18-year-old Zach Yadegari cofounded Cal AI, an AI-powered nutrition app generating $30 million annually

  • Sold his first app at 16 for $100,000, using proceeds to fund Cal AI development

  • Learned programming through YouTube and online resources after initial coding camp exposure

  • Built Cal AI to solve personal weight gain challenges, recognizing diet's crucial role in fitness results

  • Mark Zuckerberg served as major inspiration for pursuing entrepreneurship beyond game development

  • Simple advice: ignore naysayers and start building, leveraging modern tools like ChatGPT for learning

The Journey of a Teenage Founder

Zach Yadegari, an 18-year-old cofounder and CEO of Cal AI, shares his incredible journey of building an AI-powered nutrition and food tracking app that now generates around $30 million in annual revenue.

Zach Yadegari cofounded Cal AI in high school.

Early Beginnings and First Success

At just 16 years old, Yadegari sold his first app, Totally Science—an unblocked gaming website that allowed students to play games in school—for almost $100,000. The app earned him thousands per year through Google AdSense before the sale, providing the initial capital for his future ventures.

Identifying a Personal Problem

Every app or game Yadegari built was designed to solve a problem in his own life. As a skinny kid trying to gain weight, he quickly realized that most results come from diet. This personal challenge inspired him and his cofounders to create Cal AI, a calorie-tracking app that integrates cutting-edge AI technology.

Building the Team and Scaling Up

After launching Cal AI, Yadegari moved to San Francisco with one of his cofounders during their junior year of high school. At just 17 years old, they spent the summer building their team from scratch. Through strategic outreach, they connected with experienced mentors, including one who had previously scaled apps to millions of downloads.

Yadegari cofounded Cal AI before starting as a freshman at the University of Miami

Rapid Growth and Establishment

Within a year and a half, Cal AI grew into a 30-person team generating approximately $30 million in annual revenue. Yadegari describes the proudest moments of his life as meeting people who use Cal AI daily, seeing his creation make a real impact.

Learning to Code Through Self-Education

Early Exposure and Inspiration

Yadegari's coding journey began at age 7 when his parents enrolled him in a coding camp. While he didn't learn much initially, it sparked his interest in what was possible. He turned to YouTube to teach himself programming, spending hours daily watching others create video games.

From Video Games to Entrepreneurship

Attempting to recreate complex video games taught him valuable lessons about development. After watching "The Social Network," Mark Zuckerberg became a major inspiration, pushing Yadegari to pursue programming beyond game development.

Balancing School and Projects

Despite his entrepreneurial pursuits, Yadegari maintained good grades and a social life. However, he dedicated multiple hours daily outside of school to building projects, often working on them during class time.

Advice for Aspiring Founders

Just Get Started

Yadegari's best advice is simple: ignore the noise and begin building. He emphasizes that it's becoming easier to be a founder, especially with tools like ChatGPT available to the next generation.

Leveraging Available Resources

While Yadegari used Google, the internet, and YouTube as his primary learning tools, he notes that today's aspiring founders have even more powerful resources at their disposal.

Navigating College and Entrepreneurship

Finding Balance

Now enrolled at the University of Miami, Yadegari is taking a light course load while continuing to work on Cal AI. With systems in place, his role has shifted to overseeing vision and direction rather than day-to-day operations.

The Social Challenge

The biggest challenge he faces is finding like-minded peers who share his interest in real-world problems, business models, and solutions—topics most college students aren't discussing.

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