Zach Yadegari, the 19-year-old co-founder of the calorie tracking app Cal AI, has raised USD 10 million for his new venture Persona, a personal AI assistant startup that pairs a chat product with a wearable device. The round was led by Vine Ventures, with participation from Cory Levy, the founder of Z Fellows, and Collective Global, according to a report by TechCrunch.
Persona is the second major company for Yadegari, who learned to code as a child and sold a website he built as a teenager for around USD 100,000. His previous startup, Cal AI, was acquired by MyFitnessPal in March 2026, and he left the company in June to build Persona. The fresh capital gives the young founder a sizeable base in a consumer AI market that is filling up quickly.
Persona’s $10 Million Round and Its Investors
Vine Ventures led the USD 10 million round, joined by angel investor Cory Levy, who runs the Z Fellows programme, and Collective Global. The raise was reported by TechCrunch in October 2026, and Yadegari confirmed the details in that report. The company has not disclosed a valuation for the round, and no regulatory filing details have been made public. Persona was started with a second co-founder who has not yet been named.
What Persona Will Use the Money For
The capital is expected to fund product development, the rollout of the company’s hardware and the launch of its mobile app. Much of the attention is on the Persona Band, a USD 179 wearable that the company plans to ship in December. The band is built to work with the assistant, and the companion app is still in development.
Read more: AI agent startup Manus raised over USD 500 million after a planned acquisition by Meta was blocked, a deal that showed how fast investor money is moving into assistant-style products. Read the full story.
How Persona Plans to Make Money
Persona has said it will not sell users’ conversations to advertisers or data brokers. Instead, the business model leans on sponsored shopping recommendations. Yadegari has argued that the assistant will still surface balanced results, because the model does not know which products are sponsored. Payments are handled by outside providers such as Stripe, and the company says the agent cannot see a user’s card details and will only complete a purchase once the user approves it.
A $179 Wearable Band and Its Privacy Safeguards
The Persona Band is activated by a button press or a flick of the wrist, rather than listening all the time, so it is not an always-on device. The AI model does not run on the device. It runs in Persona’s cloud, where user data is encrypted in transit and at rest and can be deleted by the user. The company says it has added safeguards against phishing and prompt-injection attacks, two risks that often affect AI agents.
Zach Yadegari: From Cal AI to Persona
Yadegari grew up in Long Island, New York, and started learning computer programming at the age of seven. He was president of his school robotics club and won a research competition for a prosthetic-hand feedback system. In his teens he built Totally Science, a website that let students play games blocked on school networks, and sold it for about USD 100,000 when he was 16.
He applied to 18 universities and said 15 of them rejected him, among them Harvard, Yale and Stanford, even though he had a 4.0 GPA and an ACT score of 34. He enrolled at the University of Miami. In 2024 he co-founded Cal AI, an app that estimates the calories in a meal from a photograph. The app passed 15 million downloads and more than USD 30 million in annual revenue before MyFitnessPal bought it.
What Happens Next
Persona is currently free and in beta on iMessage, where it has a few thousand users. The company says the band has already generated five figures in preorder revenue ahead of its December launch, and the app is in the works. Whether Persona can hold on to user trust, and stand out from rivals such as Bee and Instinct, will be the real test for Yadegari’s second act.
