Zach Yadegari, the 19-year-old co-founder of calorie-tracking app Cal AI, has raised $10 million for his new AI startup, Persona, as competition intensifies in the personal AI assistant market.
According to TechCrunch, the funding round was led by Vine Ventures, with participation from Z Fellows founder Cory Levy and Collective Global. The investment follows Yadegari's departure from MyFitnessPal, which acquired Cal AI in March 2026 for an undisclosed amount. Cal AI had generated more than $30 million in annual revenue in less than two years, according to MyFitnessPal.
What Is Persona?
Persona is developing a personal AI assistant designed to help users manage everyday tasks through a connected digital experience. Rather than requiring users to switch between multiple applications, the assistant aims to bring activities such as shopping, travel booking, food ordering, note-taking and email management into one platform.
The startup is also developing a $179 wearable AI band, expected to become available in December 2026. Unlike devices that continuously listen for conversations, Persona's band is designed to activate through a physical button or a wrist movement.
Privacy and Security at the Centre
Persona says it is building privacy protections into its product. Its AI model operates in the cloud rather than directly on the wearable device, with user data encrypted in transit and at rest. The company also says users can delete their data and that conversations will not be sold to advertisers or data brokers.
The startup is developing safeguards against phishing and prompt-injection attacks. It also says the assistant cannot access users' credit-card details and that purchases require user approval through external payment providers.
However, Persona's planned business model includes sponsored product recommendations during shopping research. This raises questions about how the company will maintain user trust while generating advertising revenue.
Early Traction and Future Plans
Before the wearable launches, Persona has introduced a free beta service that users can access through iMessage. Yadegari told TechCrunch that the beta had attracted a few thousand users and that the wearable had already generated five figures in preorder revenue.
The company aims to build a more proactive assistant that can anticipate users' needs and complete tasks across connected services. Its long-term vision is to reduce the need to open multiple apps for everyday activities.
Persona enters a competitive market that includes AI assistants and wearable devices from established technology companies and emerging startups. Its ability to combine convenience, reliable task execution and transparent privacy practices will be central to its growth.
What This Means for the AI Industry
Persona's launch reflects growing investor interest in AI agents that can perform tasks rather than simply answer questions. Wearable devices could extend these assistants beyond smartphones, making AI more accessible throughout the day.
At the same time, companies developing personal AI products must address data security, user consent, advertising transparency and the risks associated with allowing AI systems to act on users' behalf.