Zach Yadegari is a young American entrepreneur who made headlines after building a successful artificial intelligence business while still in high school
He is best known as the co-founder of Cal AI, an AI-powered calorie-tracking app that allows users to estimate the nutritional value of their meals by taking pictures of their food.
His journey attracted widespread attention because he combined coding skills, business experience and a simple idea to create a product used by millions of people.
In October 2026, he made headlines again after launching a new artificial intelligence startup called Persona and raising $10 million in funding.
His journey shows how young entrepreneurs can turn everyday problems into business opportunities.
It also highlights the importance of learning from setbacks, understanding customers and building products that solve real problems.
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Table of Contents
Who Is Zach Yadegari?
Zach Yadegari is an American technology entrepreneur and software developer who gained recognition for co-founding Cal AI.1
He started learning to code at a young age and developed an interest in building digital products long before he became widely known.
Rather than waiting until adulthood to explore business opportunities, Yadegari began experimenting with software and online platforms while he was still a student. His early projects helped him understand how websites work, how users interact with technology and how a simple digital product can become a business.
His first major entrepreneurial success came through Totally Science, a website that offered access to online games.
He reportedly sold the business for $100,000 when he was 16. This experience gave him an early introduction to entrepreneurship and showed that his coding skills could have commercial value.
Yadegari later co-founded Cal AI with fellow young entrepreneurs. The app addressed a common problem faced by people who track their food intake: manually entering every ingredient and estimating the calories in a meal can be time-consuming.
Cal AI simplified the process by allowing users to take a photograph of their food. The app then uses artificial intelligence to estimate the meal’s calories and nutritional information.
The product gained popularity through app stores and social media. Its growth eventually attracted MyFitnessPal, one of the established names in digital nutrition tracking.
Yadegari’s story also became widely discussed because of his college admissions experience. Despite earning a reported 4.0 GPA and scoring 34 on the ACT, he said he was rejected by 15 of the 18 universities he applied to.
Instead of allowing the rejections to define his future, he continued developing his business career. His experience made him a prominent example in discussions about academic achievement, entrepreneurship and alternative paths to success.
Early Life and Childhood
Zach Yadegari developed an interest in computers and technology during childhood. According to reporting by CBS News New York, he began learning to code at around seven years old.
His early exposure to programming helped him develop technical skills while many children his age were still exploring basic computer applications. His interest in coding grew as he got older.
He experimented with software, learned programming languages and worked on small projects that helped him understand how digital products are created. Yadegari’s early development illustrates the value of learning through practice.
Instead of limiting his interest to theoretical knowledge, he used his skills to create projects and explore what was possible with technology. As a student, he also developed an entrepreneurial mindset.
He became interested in finding problems that could be solved with websites and software. This approach eventually led him to build online platforms that attracted users.
One of his early projects was Speed Soccer, an app he developed as a young teenager. He also worked on Totally Science, a gaming website that became his first major business success.
During the pandemic, many students relied on school-issued Chromebooks for their studies. Some schools blocked gaming websites to prevent students from using classroom devices for entertainment.
Yadegari saw an opportunity to build a website that offered access to online games that were not blocked by school filters. He named the website Totally Science.
The platform attracted users and eventually became valuable enough to sell. Yadegari has said he sold the business for $100,000 when he was 16.
This early success gave him practical experience in creating products, attracting users and completing a business sale. It also helped him develop confidence in his ability to build something useful without following a traditional career path.
Although his childhood interest in coding played a major role in his success, his journey was not simply about technical knowledge. It also involved curiosity, experimentation and a willingness to learn from each project.
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— Zach Yadegari (@zach_yadegari) October 8, 2026
Stats Table
| Category | Details |
|---|---|
| Full name | Zach Yadegari |
| Nationality | American |
| Profession | Entrepreneur and software developer |
| Known for | Co-founding Cal AI |
| Early interest | Coding and software development |
| First major business | Totally Science |
| Reported first business sale | $100,000 at age 16 |
| Best-known product | Cal AI |
| Co-founder | Henry Langmack, along with other collaborators |
| Cal AI’s main purpose | Estimating calories from food photographs |
| Reported high school GPA | 4.0 |
| Reported ACT score | 34 |
| College application results | Rejected by 15 of 18 universities |
| Cal AI acquisition | Acquired by MyFitnessPal in 2026 |
| Acquisition price | Not publicly disclosed |
| New startup | Persona |
| Persona funding | $10 million, reported in October 2026 |
Yadegari’s Academic Achievements
Yadegari’s education became an important part of his public story after his college application results attracted widespread attention.2
During high school, he reportedly earned a 4.0 grade point average and scored 34 on the ACT, a standardized college admissions test used in the United States. These results reflected strong academic performance.
At the same time, he was building a business and gaining practical experience in software development. His achievements placed him in an unusual position because he had already experienced entrepreneurial success before completing high school.
Yadegari applied to 18 universities, including several highly selective institutions. According to his public account, 15 of those universities rejected his application.
The schools included Harvard, Stanford, MIT, Princeton and Columbia.
He did receive offers from other institutions, including Georgia Tech, the University of Texas and the University of Miami.
The rejections became a major topic of discussion online. Some people questioned how a student with strong grades, high test scores and a successful business could be turned away by so many universities.
Others focused on his college application essay and argued that the way an applicant presents personal goals can influence admissions decisions. Yadegari later explained that his attitude toward college had changed.
He initially believed that entrepreneurship could provide everything he needed professionally. However, spending time around founders and technology professionals helped him consider the personal and educational experiences that college could offer.
He came to see higher education as an opportunity to learn from other people, build relationships and experience a different environment.
His experience highlights an important point: academic qualifications and business success do not guarantee admission to highly selective universities.
College admissions involve multiple factors and the reasons behind individual decisions are not always publicly known.
The Beginning of Cal AI
Cal AI became the business that brought Yadegari widespread recognition. The idea emerged from a personal interest in fitness and nutrition.
As he became more interested in gaining weight and building muscle, Yadegari began paying closer attention to his diet.
Tracking calories was an important part of understanding how much food he consumed and how it affected his fitness goals.
Traditional calorie-tracking apps often require users to search for foods, select ingredients, estimate serving sizes and enter information manually. This process can take time, especially when a meal contains several ingredients.
Yadegari and his collaborators recognized an opportunity to make this experience easier with artificial intelligence. Cal AI was designed around a straightforward concept.
Users take a picture of their meal, and the app analyzes the image to estimate its calorie content and nutritional breakdown. The goal was to make food tracking faster and more convenient.
Instead of requiring users to enter every detail manually, the app uses image recognition and AI-based estimates to simplify the process. This idea helped Cal AI appeal to people who wanted a more accessible way to monitor their eating habits.
Yadegari worked on the venture with co-founder Henry Langmack and other collaborators, including Blake Anderson.
The team focused on developing the product and attracting users through online platforms. The app gained traction after its launch in 2024.
By March 2025, Yadegari told TechCrunch that Cal AI had generated more than five million downloads. He also reported substantial monthly revenue, although TechCrunch noted that it could not independently verify those financial claims at the time.
As its popularity grew, Cal AI became an example of how a small team can use AI technology to build a consumer product that addresses an everyday need.
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How Cal AI Works
Cal AI uses artificial intelligence to estimate the nutritional information of food from photographs. Its simple interface is one of the main reasons it attracted attention.3
The process generally involves three steps.
1. Take a picture of the meal
Users photograph the food they want to track. This removes much of the manual work associated with traditional food diaries.
2. Let the app analyze the image
The AI system examines the image and attempts to identify the foods and estimate their portions. It then uses those estimates to calculate approximate calorie and nutritional values.
3. Review the results
The app presents an estimated nutritional breakdown that users can use to monitor their food intake and fitness goals. Although this process is convenient, image-based calorie estimates have limitations.
A photograph cannot always reveal the exact ingredients, cooking oils, portion weights or preparation methods used in a meal.
Foods that look similar can also have different nutritional values. For this reason, AI-generated calorie estimates should be treated as approximations rather than exact measurements.
Users who need more precise nutritional information may benefit from checking ingredients, measuring portions or consulting reliable nutrition databases.
Cal AI’s core idea was not to eliminate every limitation of food tracking. It was to make the process easier for people who wanted a quick estimate without entering extensive information.
Cal AI’s Growth and Business Success
Cal AI grew from a young entrepreneur’s idea into a widely downloaded nutrition app. Its growth reflected the increasing interest in AI-powered consumer applications and the demand for convenient digital tools.
In March 2025, TechCrunch reported that the app had attracted millions of downloads and that Yadegari claimed it was generating millions of dollars in monthly revenue.
At the time, the publication noted that it could not independently verify the revenue figures. The business continued expanding over the following months.
In March 2026, MyFitnessPal announced that it had acquired Cal AI. According to TechCrunch, the app had surpassed 15 million downloads and generated more than $30 million in annual revenue in under two years, based on information provided by MyFitnessPal.
The financial terms of the acquisition were not disclosed. As a result, the exact amount Yadegari and his co-founders received from the sale is not publicly established.
The acquisition was a major milestone in Yadegari’s career. It demonstrated that a company founded by young entrepreneurs could compete in a crowded market and attract the interest of an established industry player.
MyFitnessPal retained the Cal AI team, and the app continued operating under its own identity after the acquisition. The integration also provided an opportunity to connect Cal AI’s image-based tracking experience with MyFitnessPal’s extensive nutrition database.
For Yadegari, the deal represented more than financial success. It also provided experience in building a company, managing a team and bringing a product into a larger business ecosystem.
Why Was Zach Yadegari Rejected by 15 Universities?
Yadegari’s college rejections became one of the most discussed aspects of his story.
He publicly revealed that he had been rejected by 15 of the 18 universities he applied to, even though he had a reported 4.0 GPA, a 34 ACT score and an established business.
The results surprised many people because his academic record and entrepreneurial experience appeared impressive. However, competitive university admissions involve more than grades and test scores.
Applicants are often evaluated through essays, extracurricular activities, recommendations, personal experiences and their stated reasons for wanting to attend a particular institution. Universities also have limited places and must choose among large numbers of qualified applicants.
Yadegari’s essay became part of the online discussion because it described how he had initially dismissed college as unnecessary. He later explained that his perspective had changed after spending time with people in the technology industry.
Some online commentators believed the essay did not communicate a sufficiently strong desire for higher education. Others argued that the admissions process does not always capture the value of practical entrepreneurial experience.
However, the exact reasons for each rejection remain unknown. It would be inaccurate to claim that a particular sentence in his essay was definitely responsible for the decisions.
The episode became a wider conversation about the relationship between education and entrepreneurship. It also demonstrated that success in one area does not automatically guarantee success in another.
Yadegari’s experience offers a useful lesson for students. Building a business can strengthen an application but applicants should also explain why they want to attend a particular university and how they plan to use the educational opportunity.
Zach Yadegari’s New AI Startup: Persona
After Cal AI’s acquisition, Yadegari moved toward another business opportunity.
On October 8, 2026, TechCrunch reported that Yadegari had launched Persona, a new AI agent startup and raised $10 million in funding. Vine Ventures led the funding round, with Z Fellows founder Cory Levy and Collective Global also participating.
The new venture represents a shift from a specialized nutrition app toward a broader AI assistant. According to TechCrunch, Persona is being developed to help users complete everyday tasks through an AI-powered service.
Potential uses include handling emails, taking notes, answering questions, arranging travel and helping users access services such as food delivery and transportation.
The long-term vision is to make AI assistance more integrated into daily life. Rather than requiring users to open separate applications for different tasks, the goal is to make it easier to manage activities through a single assistant.
At the time of the October 2026 report, Persona had launched a free beta experience through iMessage and had attracted a few thousand beta users, according to Yadegari. A wearable device was also in development, with availability expected in December 2026.
The $10 million funding announcement is a significant development because it shows that investors are willing to back Yadegari’s next idea after his experience with Cal AI. However, raising venture capital does not mean a startup has already achieved long-term success.
Persona will need to demonstrate that people find its product useful, continue using it and are willing to support its business model. Its future will depend on execution, product quality, competition and the ability to turn an ambitious idea into a reliable service.
What Makes Zach Yadegari Different From Other Young Entrepreneurs?
Yadegari’s story stands out for several reasons.
He started learning early
His interest in programming began during childhood. By developing skills early, he had time to experiment with different projects and learn from mistakes before entering the professional world.
He focused on solving everyday problems
Cal AI addressed a familiar challenge. Many people want to track their food intake but find manual logging inconvenient. The app’s simple photo-based approach made the process more accessible.
He gained practical business experience as a teenager
Selling Totally Science gave him an early understanding of how a digital product can generate value. His work on Cal AI later introduced him to the challenges of scaling a consumer technology company.
He continued after facing rejection
The college admissions experience brought public criticism and debate. Yet it did not end his entrepreneurial journey. He continued building businesses and exploring new ideas.
He adapted to new opportunities
The acquisition of Cal AI marked the end of one phase of his journey and the beginning of another. Persona shows that he is interested in exploring new applications of artificial intelligence rather than relying entirely on his earlier success.
These qualities do not guarantee that every venture will succeed. However, they demonstrate why his career has attracted attention from students, founders and technology observers.
Note: Business figures and academic details are based on media reports and statements attributed to Yadegari or the companies involved. The exact acquisition price for Cal AI has not been publicly disclosed.
Lessons Young Entrepreneurs Can Learn From Zach Yadegari
Yadegari’s career offers several useful lessons for people interested in technology and business.
Start with a real problem. Cal AI was built around a common frustration with manual calorie tracking.
Products that solve clear problems may have a better chance of attracting users than ideas created only because a technology is fashionable.
Learn by building. Coding tutorials and educational resources can help develop skills but working on actual projects teaches people how to solve practical problems.
Keep the product simple. Cal AI’s main appeal was its straightforward process. Users could take a picture instead of manually entering every food item.
Understand the business side. A useful product must also reach customers, retain users and generate enough revenue to support its operation.
Do not treat rejection as a final judgment. University admissions, job applications and business proposals can produce disappointing results. One decision does not determine a person’s entire future.
Remain open to learning. Yadegari’s changing views about college show that people can reconsider their plans as they gain experience. Success is not only about proving an earlier opinion correct.
Be realistic about technology. AI can make products faster and more convenient but its results may still contain errors. Responsible product development requires understanding limitations as well as benefits.
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FAQ’s
1. Who is Zach Yadegari?
Zach Yadegari is an American entrepreneur and software developer best known for co-founding Cal AI, an artificial intelligence app that estimates the calories in food from photographs.
2. How old is Zach Yadegari?
TechCrunch described Yadegari as 19 years old in October 2026. His age may change as he approaches his next birthday, so readers should check a current profile for an exact date of birth.
3. What is Cal AI?
Cal AI is an AI-powered calorie-tracking app that estimates the calories and nutritional information of meals using photographs. It was developed to make food tracking quicker and easier.
4. How did Zach Yadegari make his first business income?
Yadegari built Totally Science, a website offering access to online games. He reportedly sold the website for $100,000 when he was 16.
5. Why did Zach Yadegari become famous?
He became widely known for co-founding Cal AI while still in high school. His profile grew further after he revealed that 15 of the 18 universities he applied to had rejected him despite his strong academic results and business achievements.
6. Was Zach Yadegari rejected by Harvard and Stanford?
Yes. According to reports about his college applications, he was rejected by both Harvard and Stanford, along with several other highly selective universities.
Conclusion
Zach Yadegari’s journey is an example of how curiosity, technical skills and practical problem-solving can create opportunities at a young age.
From learning to code as a child to building Totally Science and co-founding Cal AI, he developed his entrepreneurial experience by creating products and learning from real-world challenges.
His journey should not be viewed as proof that college is unnecessary or that every young entrepreneur will achieve similar results.
Instead, it offers a broader lesson: education, practical experience, persistence and adaptability can all contribute to personal and professional growth.
For aspiring entrepreneurs, Yadegari’s story is a reminder that a successful business often begins with a simple question: What problem can I solve, and how can I make the solution easier for people to use?
That mindset helped him build Cal AI, and it may shape the next chapter of his career.
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