Rhem Labs, a San Francisco startup fresh from Y Combinator, launched reservations for a $599 countertop device that promises to solve one of eldercare's thorniest dilemmas: how to keep tabs on an aging parent without turning their bedroom into a surveillance state. The company says it will ship the robot, called Halo, by early November to customers who put down a refundable deposit.
The pitch is straightforward, if not entirely novel. Three-quarters of Americans over 50 want to stay in their own homes as they age, AARP reported late last year. Yet families attempting to honor that wish often face an uncomfortable bargain: install cameras that feel like an invasion, or rely on medical-alert pendants that wind up forgotten on nightstands. Rhem's answer is a box of sensors that tracks falls and vital signs using millimeter-wave radar instead of lenses.
Halo sits wherever there's counter space and watches for trouble using 60 GHz radar pulses, a technology borrowed from automotive collision-avoidance systems. The radar chip—a Texas Instruments IWR6843, for those keeping score—can tell whether someone toppled over and got back up, or stayed down. A separate array of health sensors measures blood pressure without a cuff, along with heart rate, oxygen levels, and body temperature, all in a matter of seconds.
The device also sniffs for air quality problems like formaldehyde and elevated CO2, then pings family members through a mobile app when something seems amiss: a fall, prolonged stillness, or an emergency phrase spoken aloud. A 7-inch touchscreen handles medication reminders and video calls. Rhem says all the computation happens locally on a 72-TOPS neural processor, meaning health data never leaves the home. Users worried about connectivity can toggle on what the company calls "Lockdown Mode," severing the internet link entirely.
Jacob Shen, CEO and founder, and his father Huey Shen, CTO and founder, built Rhem after caregiving crises in their own family—a grandmother's stroke, an aunt's brain tumor. The pair went through Y Combinator recently and now run a team of two, according to the accelerator's directory. "Rhem is building consumer robots and smart devices that help our parents stay independent for longer and give their families peace of mind," Jacob Shen wrote on LinkedIn when announcing the launch earlier this month.
They're entering a market that's crowded but unsettled. Vayyar Care sells 4D imaging sensors for touchless monitoring. Nobi, a Belgian company, mounts smart lamps on ceilings; an NHS pilot across hundreds of UK homes reportedly cut fall likelihood by nearly a third, though the timeline and scale of that trial remain somewhat murky. Amazon shuttered its Alexa Together service in May 2025, leaving families to stitch together patchwork solutions from Ring doorbells and third-party sensors.
The labor economics driving interest in these devices are unforgiving. The Bureau of Labor Statistics expects demand for home health aides to surge 17 percent through 2034, adding nearly 740,000 jobs that pay a median of about $34,900 annually. The physician shortage could hit 86,000 doctors by the mid-2030s, the American Association of Medical Colleges has warned. Rhem frames Halo as a way to stretch scarce caregiver hours rather than replace human judgment. A disclaimer on the company's blog notes that home vitals checks "are not a substitute for urgent judgment" and encourages users to discuss trends with doctors during regular visits.
The startup filed a trademark application in September for the tagline "Your Parents' Favorite Robotics Company," covering companion robots and health apps. A job posting on Y Combinator's board shows Rhem is hunting for a founding creative generalist in San Mateo. Pricing remains somewhat fluid: the current $599 reservation tier will apparently give way to a planned $799 Kickstarter campaign, then a $1,099 retail price, though Rhem hasn't confirmed a Kickstarter launch date or named any retail partners. Whether families will pay quadruple digits for radar-powered peace of mind is a question the company will start answering in a few weeks.
