Hiyd is trying to solve a narrow but visible problem in wearables: people who want health data without replacing a traditional watch. Its first product is a 2.7-millimeter-thick, 7-gram sensor that attaches to the back of an existing watch and sends biometric data to a phone app.
The device uses a microsuction layer rather than magnets or adhesive. Hiyd says the material holds the sensor against the watch case without leaving residue or interfering with mechanical movements. The planned measurements include heart rate, heart-rate variability, sleep stages, movement, calories burned and estimated VO2 max.
A different route into a crowded market
Hiyd is not competing by adding another screen. Its bet is that design-sensitive buyers will value invisibility, compatibility with watches they already own and the absence of a monthly fee. The company lists a $149 early-bird price for its second-generation device and plans a Kickstarter launch in November 2026.
More than 16,000 people have placed refundable deposits, according to founder Salah Batroukh. That figure shows interest, but it is not the same as completed sales. Crowdfunding conversion, manufacturing yield and delivery performance will provide better evidence of demand.
The technical challenge is also substantial. Hiyd is training activity-recognition models on labeled movement data, then combining those readings with health metrics in its app. The company wants to connect behavior such as late workouts or meals with sleep and recovery. Those personalized explanations will need careful validation because correlation in wearable data does not prove that a specific behavior caused a change.
Execution matters more than novelty
Batroukh previously worked in manufacturing design at Apple, and the founding team includes mechanical and software experience. That background may help with miniaturization, but a hardware startup still faces tooling, quality-control, battery and customer-support risks that software companies can avoid.
Hiyd's own reservation page says the first batch is expected to ship by the second quarter of 2027 at the latest. The delay between the November campaign and delivery gives the company time to refine the product, but it also leaves room for cancellations and competing launches.
The first investor-grade evidence will be paid Kickstarter orders, on-time production and independent accuracy testing. Until those appear, Hiyd is best understood as a differentiated product concept with promising early interest, not a proven challenge to established wearables.