Summary
Zach Yadegari, the 19-year-old co-founder of calorie-tracking app Cal AI, has launched a new AI startup called Persona and raised $10 million in funding. The company is developing a personal AI assistant designed to help users manage everyday tasks through messaging and a dedicated wearable device.
Persona plans to offer a $179 AI wristband that allows users to activate the assistant without constantly listening to their conversations. The startup is also focusing on privacy protections, shopping recommendations, and tools that could bring multiple everyday digital services into a single AI-powered experience.
What Happened?
Zach Yadegari has moved on from Cal AI to launch Persona, a startup focused on personal AI assistance. According to TechCrunch, the company raised $10 million in a funding round led by Vine Ventures, with participation from Z Fellows founder Cory Levy and Collective Global.
Yadegari previously gained attention as a co-founder of Cal AI, a calorie-tracking app that became popular in app store rankings. In March 2026, MyFitnessPal acquired the company for an undisclosed amount.
At the time, MyFitnessPal told TechCrunch that Cal AI had generated more than $30 million in annual revenue in less than two years.
Yadegari initially continued working on Cal AI following the acquisition but left MyFitnessPal in June to develop his next venture. He is building Persona with another co-founder whose identity has not yet been announced.
What Is Persona AI?
Persona is designed to act as a personal AI assistant that can help users complete everyday activities without switching between multiple applications.
According to Yadegari, the assistant will support tasks such as ordering food, booking rides and travel, taking notes, answering questions, and helping users manage emails.
The company is working toward a broader vision in which an AI assistant becomes a central point for accessing services that people currently use through separate apps.
Persona has already launched a free beta version that users can access through iMessage. Yadegari told TechCrunch that the service had attracted a few thousand beta users.
The startup is also developing a dedicated wearable device intended to make the assistant more accessible throughout the day.
Persona’s $179 AI Wearable Band
One of Persona’s main products is a wearable AI band expected to cost $179. The company expects the device to become available in December 2026.
Unlike wearables that continuously listen to their surroundings, Persona’s band is designed to let users activate the assistant when needed.
Users will be able to press a button to start the assistant or configure it to activate with a flick of the wrist, according to Yadegari.
This approach is intended to give users more control over when the device interacts with them.
The wearable is part of Persona’s broader effort to make AI assistance available without requiring users to constantly look at their smartphones. The company is also developing a dedicated app.
Yadegari said the company had already generated five figures in preorder revenue, although he did not disclose a more precise figure in the report.
How Persona Plans to Protect User Privacy
Privacy is an important part of Persona’s product positioning, but its approach differs from a fully on-device AI system.
The company says its AI model runs in the cloud rather than directly on the wearable. As a result, user data must be transmitted to Persona’s servers for processing.
According to Yadegari, the company encrypts data both during transmission and while it is stored. Users will also be able to delete their data.
The wearable is not designed to record continuously, and the company says users will control when the assistant is activated.
Persona is also developing safeguards against phishing and prompt-injection attacks. These threats can manipulate AI systems into taking unintended actions or following malicious instructions.
However, the effectiveness of these protections will need to be assessed as the product becomes more widely available.
AI Shopping and Sponsored Recommendations
Persona is planning to generate revenue partly through advertising.
During shopping research, the assistant may present sponsored products alongside other recommendations. For example, someone looking for an office chair could receive suggestions based on their preferences, including some advertised products.
Yadegari says the assistant will not know which products are sponsored when generating its recommendations. The company argues that this approach will help keep recommendations aligned with user preferences.
The model nevertheless raises questions about how sponsored products will be identified and whether advertising will influence the shopping experience.
Persona says it will not sell user data to advertisers or data brokers. Its approach to advertising and privacy will be important factors for users evaluating the service.
Payment Security and AI Agent Safeguards
Personal AI assistants can become more useful when they are able to take actions rather than simply answer questions. However, allowing an AI agent to make purchases or interact with online services also introduces security risks.
Yadegari says Persona will not have access to users’ credit-card details, and purchases will require user approval. Payments will be handled through external providers, including Stripe Link.
The company is also working on safeguards against phishing and prompt-injection attacks, which can attempt to trick AI agents into performing actions their users did not intend.
These protections will be particularly important if Persona expands its ability to book services, order products, and manage other activities on a user’s behalf.
What Happens Next?
Persona is currently available as a free beta through iMessage, while its wearable band and dedicated app remain in development.
The company expects the $179 band to become available in December 2026. Its progress will depend on how well the product performs in real-world use, how effectively it protects user information, and whether consumers find an AI assistant useful enough to adopt as part of their daily routines.
The $10 million funding round gives the startup resources to develop its products and expand its services.
Conclusion
Zach Yadegari is returning to the startup world with Persona after the acquisition of Cal AI by MyFitnessPal. His new company aims to combine a personal AI assistant with a wearable device that can help users manage everyday tasks.
The idea reflects a broader effort to make AI assistants more practical by connecting them with the services people already use. However, Persona will need to demonstrate that its privacy protections, security safeguards, and advertising model can earn users’ trust.
If the company delivers on its plans, Persona could become another contender in the growing market for consumer AI assistants and wearable technology.