Cal AI founder Zach Yadegari raises $10M to put an ad-funded AI agent on a $179 wristband

A Persona user shopping for an office chair today types the request into iMessage, where the assistant runs as a free beta ^[15]. Yadegari said "the agent knows their preferences," so the chairs it returns match them, and some of those chairs are sponsored results ^[2]. Persona's current business model relies on ads shown during shopping research ^[1]. Yadegari says the recommendations stay unbiased because the agent will not know which items are advertised, and the company says user conversations cannot be sold to advertisers or data brokers ^[1][13].

The pitch goes further than a text thread. "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 don't need to stare at a rectangle in your hand all day," Yadegari said ^[21]. Roadmap aside, what users do now is type into the phone ^[15]. The beta has drawn "a few thousand beta users," he said, and the band has generated "five figures in preorder revenue" ^[16][17]. At the $179 list price, five figures is between about 56 and 560 bands ^[19]. The report does not say whether preorders were paid in full or how many beta users keep using the assistant from week to week.

TechCrunch likens the assistant to Instinct or Meta's Muse, and says the band makes it somewhat more like Bee, the wearable AI device Amazon bought in 2025 ^[7][8]. Persona does not run its model or store user data on the band ^[10]. Requests go to Persona's cloud, encrypted in transit and at rest, and users can delete their data ^[10]. The band wakes on a button press or a flick of the wrist and is not always listening and recording, the main difference Yadegari draws with Bee ^[9].

The purchase step carries most of the safeguards. The agent cannot see card details, each purchase needs the user's approval, and payment runs through outside providers such as Stripe Link, Stripe's wallet built for agents ^[12]. The team is also building defences against phishing and prompt injection, two problems that AI labs such as OpenAI say can plague agents ^[11].

Yadegari said phone apps for shopping, Uber, DoorDash and email "are all collapsing and will collapse into a single super app powered by an AI assistant" ^[20]. So far his few thousand users reach that super app through iMessage, one more app on the phone ^[15][16].

Two questions sort a week of tasks for anyone weighing a $179 band, on their own wrist or in their own agent plans ^[7]. The first is where a request starts: with the phone in hand, or with it out of reach. The second is where it ends: in information, such as a note or an answer, or in a purchase, where the sponsored items and the approval step appear ^[1][12]. Phone in hand and information is the free text thread's job. Phone in hand and purchase is still the text thread, with the ad question attached. Out of reach and information, such as a note taken mid-walk, is the band's clearest case. Out of reach and purchase lets the band start the order, though the user still has to approve it ^[12]. I'd judge Persona on the iMessage version until band owners have a few months of use. The tradeoff is that this sets aside the out-of-reach column, the one place the band, as described, adds something the text thread does not ^[9][10].