A Teen Founder's Next Act

Zach Yadegari, the 19-year-old entrepreneur who co-founded the calorie tracking app Cal AI, has moved quickly from one attention-grabbing venture to another. His newest company, Persona, is building a personal AI assistant, and it has already raised $10 million in funding. Vine Ventures led the round, with participation from Z Fellows founder Cory Levy and Collective Global. The raise signals continued investor appetite for consumer AI products, especially those tied to a hardware device and a recurring software relationship.

Persona is not starting from zero. The company has launched a free beta product that lets users interact with the assistant through iMessage text messages. Yadegari says the beta has attracted a few thousand users. The startup is also taking preorders for a wearable band priced at $179. According to Yadegari, those preorders have generated five figures in revenue. A companion app is in development, and the bands are expected to be available in December.

The funding and product plans arrive less than a year after Yadegari's previous company changed hands. In March, Cal AI was acquired by MyFitnessPal for an undisclosed sum. The deal followed Cal AI's rapid rise in app store rankings, where it moved ahead of older calorie tracking apps. Cal AI had pulled in more than $30 million in annual revenue in under two years, a pace that made the acquisition significant for the buyer. After the sale, Yadegari and his co-founders went to work for the new owner, continuing development on Cal AI. But Yadegari left the larger company in June and immediately turned to his next idea.

That idea is Persona, a personal AI assistant that combines cloud-based software with a wearable band. The product category is becoming crowded. Persona has been compared to Instinct and Meta's Muse, two other assistant efforts, but its hardware component sets it apart. The band is also reminiscent of Bee, a wearable AI device that Amazon acquired in 2025. Yadegari says Persona's device differs in several important ways.

Privacy, Buttons, and a Non-Ambient Wearable

One major difference is that Persona will not be an ambient AI. It will not always be listening and recording. Instead, the band will have a button that activates the assistant. Users can also set it up to activate with a flick of the wrist. That design choice is meant to give users more control over when the assistant is active and when it is not.

Yadegari also says Persona is designed with user privacy in mind. The AI model does not run on the device, and user data is not stored on the band. Instead, the model runs in Persona's cloud, and user data is sent there for processing. The company says it protects privacy by encrypting data in transit and at rest. Users can also delete their data. Persona promises that user conversations stay private and cannot be sold to advertisers or data brokers.

The team is baking in safeguards to protect the assistant against phishing and prompt-injection attempts. Those are two areas that can plague AI agents. Prompt injection occurs when malicious instructions are hidden in content that an AI model reads, potentially causing the agent to follow the attacker's commands instead of the user's. Phishing attempts try to trick users into revealing sensitive information. Yadegari says Persona is being built to resist both.

Payment security is another focus. Yadegari promises that Persona's agent cannot see a user's credit-card details. Purchases will require the user's approval, and payment will be handled through external providers such as Stripe Link. Link is a secure wallet designed for use by agents. That architecture keeps sensitive financial information outside the assistant's direct view while still allowing it to help with transactions.

An Ad-Supported Assistant With a Promise of Neutrality

Although user data will not be sold to advertisers, Persona's current business model does rely on ads. Yadegari says the company will show advertised wares during shopping research. That creates an obvious tension: an assistant that recommends products may also be paid to promote some of them. Yadegari argues that the agent will present unbiased recommendations because it will not know which items are advertised. For example, if someone is researching office chairs, he says the agent knows their preferences and will show them chairs that match those preferences. Some of those results may be sponsored, but the agent itself will not distinguish between sponsored and organic items when making its recommendations.

That approach is likely to face scrutiny. Consumer AI assistants are increasingly acting as shopping intermediaries, and regulators and advocates have raised concerns about whether sponsored results are clearly disclosed. Persona's model attempts to separate the advertising business from the recommendation logic. Whether that separation is convincing to users, or sufficient for regulators, remains to be seen.

What Persona Can Do

Like other consumer AI assistants, Persona can order food or rides, take notes, book travel, answer questions, and handle emails, among other tasks. The goal is to reduce the number of separate apps a person needs to open. Yadegari frames this as a broad shift in how people will use their phones.

All of the utility apps that you use on your phone day-to-day, whether those are apps for shopping, whether it is Uber, DoorDash, your email, these are all collapsing and will collapse into a single super app powered by an AI assistant, Yadegari said.

Eventually, he hopes to make Persona even more proactive. It can offer help and solve problems before you even know you have a problem, and overall be more seamless with your life, so that you do not need to stare at a rectangle in your hand all day, he said.

That vision places Persona in competition with a growing field of AI assistants from large technology companies and startups alike. The promise of a single assistant that can handle multiple daily tasks is appealing, but it also requires deep integrations, reliable execution, and user trust. Persona's beta through iMessage is a low-friction way to test those capabilities before the hardware arrives.

A Fast Rise and a Fresh Start

Yadegari's path to Persona has been unusually fast. Before Cal AI, he built his first business in the ninth grade and sold it for $100,000 when he was 16. Cal AI became his breakout success, reaching more than $30 million in annual revenue in under two years and eventually attracting an acquisition offer from MyFitnessPal. The sale was big enough to convince Yadegari and his co-founders to sell the company, according to statements made at the time.

Now he is taking on a more ambitious category. Persona combines AI software, a wearable device, and an advertising-supported business model. The $10 million raise gives the startup room to build out the product, grow the beta, and prepare for the December launch of the band. The involvement of Vine Ventures, Cory Levy, and Collective Global adds credibility as the company competes for attention in a crowded market.

The stakes are high. Consumer hardware is difficult to manufacture and scale, and AI assistants must earn trust around privacy, accuracy, and payments. Persona's decision to avoid always-on recording, to encrypt data, and to keep credit-card details away from the agent may help differentiate it. Its ad-supported model, however, will test whether users believe an assistant can recommend products without being influenced by sponsorship.

For now, Persona is available as a free beta through iMessage. The $179 band is available for preorder, with shipping expected in December. An app is in the works. Yadegari says he is working with another co-founder whose identity has not yet been announced.

Source:TechCrunch News