Zach Yadegari’s Journey: From Calorie Tracking to AI Innovation
Zach Yadegari, the teen co-founder of the popular calorie tracking app Cal AI, has once again made headlines with the launch of his new startup, Persona. This AI agent company recently secured $10 million in funding, led by Vine Ventures, with participation from Cory Levy, founder of Z Fellows, and Collective Global. Persona represents Yadegari’s next ambitious step in the AI space, building on the success of Cal AI and his proven entrepreneurial track record.
Earlier this year, in March, MyFitnessPal acquired Cal AI for an undisclosed amount. The acquisition followed Cal AI’s rapid rise in the app store, surpassing older calorie tracking apps, and generating over $30 million in annual revenue in less than two years. Despite the lucrative deal, Yadegari and his co-founders initially stayed on with MyFitnessPal to continue developing Cal AI, but Yadegari departed the company in June to focus on his new venture.
Introducing Persona: A Next-Generation AI Assistant with a Wearable Twist
Persona is designed as a personal AI assistant similar to Instinct or Meta’s Muse but distinguishes itself with a tangible hardware component: a $179 wearable band. This band aims to bring AI assistance closer to the user’s daily life in a seamless and privacy-conscious way.
Image Credits:Persona
The wearable’s design intentionally avoids always-on listening; instead, users can activate the assistant via a button on the device or a simple wrist flick. This approach contrasts with Amazon’s Bee, a wearable AI device acquired in 2025 that features ambient AI capabilities. Yadegari emphasizes that Persona prioritizes user privacy, as the AI model operates in the cloud rather than on the device, with all data encrypted during transit and storage. Users retain control over their data, including the ability to delete it.
These privacy measures are crucial to ensuring that conversations stay confidential and aren’t exploited for advertising or data brokerage. The startup is also proactively incorporating defenses against common AI vulnerabilities such as phishing and prompt-injection attacks, issues that continue to challenge even established AI labs like OpenAI.
Privacy, Security, and Business Model
Yadegari stresses that Persona’s assistant cannot access sensitive information such as credit card details. Purchases require explicit user approval and are facilitated through secure external providers like Stripe Link, Stripe’s specialized wallet for AI agents.
While the company’s business model currently includes advertising, Yadegari assures that ad-supported recommendations will remain unbiased. The AI assistant will show users products aligned with their preferences, some of which may be sponsored, but the agent itself will not be aware of which items are advertisements. For example, during research for office chairs, Persona will present options that fit the user’s tastes, blending organic and sponsored results seamlessly.
Beta Launch and Future Prospects
Persona’s wearable bands are slated for availability in December, accompanied by a dedicated app. Meanwhile, the company has launched a free beta version that allows users to interact with the assistant via iMessage text. This beta has already attracted a few thousand users and generated five-figure preorder revenues for the band.
Like other consumer AI assistants, Persona can perform everyday tasks such as ordering food, booking rides, taking notes, managing travel plans, and handling emails. Yadegari envisions Persona evolving into a “super app” that consolidates numerous utility apps into one AI-powered platform.
Looking ahead, Yadegari hopes Persona will become more proactive and intuitive—anticipating user needs and resolving issues before users are even aware of them. This vision aims to reduce the reliance on constantly staring at screens, creating a more fluid and integrated digital experience.
Zach Yadegari will speak at TechCrunch Disrupt on “How to create viral growth and capitalize on it,” taking place October 13-15 at the Moscone Center in San Francisco. Prior to Cal AI, Yadegari founded his first business in ninth grade and notably sold a gaming startup for $100,000 at age 16.
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