Zach Yadegari, The 19-year-old entrepreneur behind Cal AI is building a new AI assistant after selling his calorie-tracking app to MyFitnessPal. His latest venture combines a wearable device, an iMessage-based assistant and a funding round led by Vine Ventures.

At 19, Zach Yadegari has already built and sold two businesses. Now, the young American entrepreneur is turning his attention to something different: an artificial intelligence assistant designed to help people manage everyday tasks without constantly listening to their conversations.

His latest startup, Persona, has secured $10 million in funding, with Vine Ventures leading the investment round. Cory Levy, founder of Z Fellows, and Collective Global also participated, according to TechCrunch.

The funding comes just months after MyFitnessPal acquired Cal AI, the calorie-tracking application that helped establish Yadegari as a young name in the technology industry.

Persona’s planned product includes a $179 wearable device that users can activate with a button or wrist movement. It is an approach that could distinguish the startup from AI assistants designed to remain continuously available through voice commands.

For Yadegari, it also marks another chapter in an entrepreneurial journey that began long before he finished school.

Who Is Zach Yadegari? From Coding at Seven to Selling His First Business at 16

Yadegari grew up on Long Island, New York, and began learning computer programming when he was seven years old.

His interest in technology eventually led him to build Totally Science, a gaming website that allowed students to access games restricted on school networks.

The idea developed into his first business, Yadegari sold Totally Science for approximately $100,000 at the age of 16.

Rather than stopping there, he moved into artificial intelligence with Cal AI, an application launched in 2024.

The app offered a straightforward way to estimate calorie intake. Instead of manually entering every ingredient or searching through food databases, users could upload photographs of their meals to receive calorie estimates.

That approach helped Cal AI attract a substantial audience and eventually brought the company to the attention of MyFitnessPal.

Cal AI Crossed 15 Million Downloads Before Its Acquisition

In March 2026, MyFitnessPal announced that it had acquired Cal AI.

By the time of the acquisition, Cal AI had surpassed 15 million downloads and generated more than $30 million in annual revenue within two years.

The numbers reflected how quickly a relatively simple consumer application could grow when AI was applied to an everyday activity.

Cal AI focused on reducing the effort involved in tracking food intake. Persona, Yadegari’s next venture, is taking that thinking into a broader category of personal assistance.

After leaving MyFitnessPal in June 2026, Yadegari began working on the new startup.

Persona’s $179 Wearable Takes a Different Approach to AI Assistance

One of the most notable elements of Persona is how its planned wearable device will be activated.

Instead of functioning as an always-listening assistant, the device is designed to respond when the user presses a button or makes a wrist movement.

The distinction is particularly relevant for AI products that rely on access to personal conversations and daily activities.

By requiring a deliberate action to activate the assistant, Persona is positioning its wearable around user-controlled interaction.

The company plans to introduce the device in December 2026 at a price of $179.

The startup is also developing an AI assistant intended to help users manage routine activities, expanding beyond the single-purpose functionality that defined Cal AI.

Persona Already Has Thousands of Beta Users on iMessage

Although its wearable device has yet to launch, Persona has begun testing its assistant through Apple’s iMessage platform.

Yadegari told TechCrunch that the service had attracted “a few thousand beta users”.

The early rollout offers the company an opportunity to develop its assistant before introducing dedicated hardware.

It also means Persona is entering the market with an existing testing audience, though the reported beta-user count remains far smaller than the audience Cal AI reached.

An important question will be whether people who try the assistant through messaging will eventually see enough value in a separate device to purchase one.

The College Rejections That Brought Zach Yadegari Into the Spotlight

Long before announcing Persona, Yadegari attracted attention for a very different reason.

In April 2025, he revealed that 15 of the 18 universities he had applied to rejected his applications, including Harvard, Yale and Stanford.

The rejections drew attention because his academic record appeared strong.

Yadegari reported having a 4.0 grade point average and an ACT score of 34. He had also established a business before applying to college.

Despite those achievements, he did not secure admission to several of the institutions he had targeted.

He subsequently enrolled at the University of Miami.

His experience attracted attention to the relationship between conventional academic admissions and entrepreneurial achievement.

Since then, his business career has continued to develop. Cal AI was acquired in March 2026, and Persona has now attracted $10 million from investors.

What Comes Next for Zach Yadegari and Persona?

Persona’s next major milestone is its planned December wearable launch.

The startup has funding, an early group of beta users and a founder with experience building consumer-facing applications.

What remains unproven is whether its broader vision for AI assistance can attract and retain users in a competitive market.

There is also a difference between persuading people to download an application and convincing them to spend $179 on a dedicated wearable.

The planned device will need to offer a compelling reason for people to adopt another piece of personal technology, particularly when AI assistants are already accessible through smartphones and other devices.

Persona’s button- or movement-activated design gives the company a specific product direction, but its long-term prospects will depend on how effectively the technology works outside controlled testing.

Yadegari’s previous ventures demonstrate that he has experience turning software ideas into businesses. Persona presents a new challenge, one that combines AI software, consumer hardware and a recommendation-based commercial model.

At 19, he has moved from building a gaming website for students to launching a funded AI startup with ambitions in personal technology.

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