Teen Entrepreneur Zach Yadegari Secures $10M for Persona

Zach Yadegari, the 19-year-old co-founder of the viral calorie tracking app Cal AI, has raised $10 million for his newest venture, Persona. The funding round was led by Vine Ventures, with participation from Z Fellows founder Cory Levy and Collective Global. Persona is an AI agent startup that aims to create a personal AI assistant, complete with a wearable band priced at $179.

The announcement comes just months after MyFitnessPal acquired Cal AI in March for an undisclosed sum. The acquisition was a significant exit for Yadegari and his co-founders, who had built Cal AI into a formidable competitor in the health and fitness app space. At the time of the acquisition, Cal AI had pulled in over $30 million in annual revenue in under two years, a feat that caught the attention of industry giants.

From Cal AI to Persona: A Rapid Transition

Following the acquisition, Yadegari and his team initially stayed on to continue developing Cal AI under MyFitnessPal's ownership. However, Yadegari left the larger company in June to pursue his next big idea. He quickly assembled a team and began working on Persona. While he is collaborating with another co-founder, that person has yet to be announced.

Persona is described as a personal AI assistant similar to Instinct or Meta’s Muse, but with a hardware component that sets it apart. The centerpiece is a $179 wearable band that is expected to be available in December. The band is designed to be a discreet, always-accessible AI companion, but unlike some competitors, it is not an ambient AI device. This means it won’t be constantly listening and recording. Instead, users activate the assistant by pressing a button on the band or by flicking their wrist.

Privacy-First Design and Security Features

Privacy has been a major concern for wearable AI devices, and Yadegari emphasizes that Persona is built with user privacy in mind. The AI model does not run on the device itself; instead, it operates in Persona’s cloud, where user data is sent. The company states that data is encrypted both in transit and at rest, and users have the ability to delete their data. This approach aims to ensure that user conversations remain private and cannot be sold to advertisers or data brokers.

The team is also incorporating safeguards to protect against phishing and prompt-injection attacks, which are common vulnerabilities for AI agents. Additionally, Persona’s agent is designed so that it cannot access a user’s credit-card details. Purchases require explicit user approval, and payments are handled through external providers such as Stripe Link, a secure wallet designed for use by agents.

An Ad-Supported Business Model with a Twist

While user data won’t be sold to advertisers, Persona’s current business model does rely on advertising. Yadegari explains that the company will show advertised products during shopping research. However, he claims that the agent will present unbiased recommendations because it won’t know which items are advertisements. For instance, if a user is researching office chairs, the agent will use their preferences to suggest matching chairs, some of which may be sponsored results. This approach aims to balance monetization with user trust.

The bands are expected to ship in December, and an app is currently in development. In the meantime, Persona has launched as a free beta product where users interact with the assistant via iMessage text messages. So far, it has attracted a few thousand beta users, and the band has already generated five figures in preorder revenue.

What Can Persona Do?

Like other consumer AI assistants, Persona is designed to handle a wide range of tasks. According to Yadegari, it can order food or rides, take notes, book travel, and answer questions and emails, among other functions. He envisions a future where all the utility apps people use daily—shopping, Uber, DoorDash, email—will collapse into a single super app powered by an AI assistant.

“All of the utility apps that you use on your phone day-to-day, whether those are apps for shopping, whether it’s Uber, DoorDash, your email — these are all collapsing and will collapse into a single super app powered by an AI assistant,” Yadegari said. He hopes to eventually make Persona even more proactive, offering help and solving problems before users even know they have a problem, making life more seamless so that people don’t need to stare at a rectangle in their hand all day.

A Track Record of Early Success

Yadegari’s entrepreneurial journey began long before Cal AI. He built his first business in the ninth grade and sold it for $100,000 when he was just 16. That early success laid the groundwork for Cal AI, which quickly gained traction by offering a streamlined calorie tracking experience. The app zoomed ahead of older competitors in the app store rankings, eventually catching the eye of MyFitnessPal.

The acquisition of Cal AI was a major milestone for the young founder, but he didn’t rest on his laurels. Within months, he was back at work on Persona, aiming to disrupt the burgeoning AI assistant market. His experience with Cal AI has given him insights into viral growth and user acquisition, which he plans to share at an upcoming tech conference in a talk titled “How to create viral growth and capitalize on it.”

The Competitive Landscape of AI Wearables

Persona enters a crowded field of AI wearables and assistants. Devices like the Humane AI Pin and Rabbit R1 have attempted to create standalone AI gadgets, with mixed reviews. Amazon acquired Bee, a wearable AI device, in 2025, signaling interest from major tech companies. Meta has also invested in AI assistants with its Muse project. However, Persona differentiates itself through its focus on privacy, its non-ambient design, and its ad-supported model.

The $179 price point is relatively affordable compared to some competitors, which could help drive adoption. The band’s ability to work with iMessage for the beta version lowers the barrier to entry, allowing users to try the assistant without purchasing hardware. This strategy may help Persona build a user base before the band ships.

Privacy and Security in AI Assistants

As AI assistants become more integrated into daily life, privacy concerns are paramount. Many users are wary of devices that constantly listen and record. Persona’s decision to avoid ambient AI could appeal to privacy-conscious consumers. The cloud-based model, while necessary for advanced AI capabilities, raises questions about data storage and potential breaches. Persona’s encryption and data deletion options are steps in the right direction, but the company will need to maintain transparency to build trust.

The safeguards against phishing and prompt injection are also crucial. As AI agents become more capable of executing tasks, they become attractive targets for malicious actors. By isolating credit-card details and requiring user approval for purchases, Persona reduces the risk of unauthorized transactions. The use of Stripe Link for payments adds an extra layer of security.

The Future of AI Assistants and Super Apps

Yadegari’s vision of a single super app powered by AI aligns with broader industry trends. Tech companies are racing to create AI assistants that can seamlessly handle multiple tasks, from scheduling to shopping. The idea is to reduce app fatigue and provide a more intuitive user experience. However, achieving this requires robust AI models, seamless integrations, and user trust.

Persona’s success will depend on its ability to execute on its promises. The beta via iMessage is a clever way to gather user feedback and iterate quickly. The preorder revenue indicates early interest, but the real test will come when the band ships and users integrate it into their daily lives. If Persona can deliver on its privacy promises and provide a genuinely useful assistant, it could carve out a niche in the competitive market.

For now, Yadegari and his team are focused on preparing for the December launch. The app is in development, and the beta continues to attract users. With $10 million in fresh funding, Persona has the resources to scale its operations and marketing. The coming months will be critical as the startup transitions from beta to full commercial availability.

The bands are expected to be available in December, and an app is in the works.

Source: TechCrunch News