Oura Ring 4
A discreet health tracker whose strongest argument is not exercise screens—it is wearing the sensor long enough to build useful sleep and recovery context.
Oura Ring 4 moves the sensing hardware into a smoother fully titanium ring with recessed sensors, tracking sleep, heart rate, HRV, temperature trends, blood oxygen, activity and stress while leaving the wrist free.
The evidence
The subscription is part of the hardware economics
The ring is only half the proposition. Oura's deeper analysis requires an active membership at $5.99 per month or $69.99 annually in the U.S., so a disciplined buyer should underwrite several years of software cost rather than only the purchase price.
Benchmark — for sleep and recovery wearables
Oura remains the reference point because the form factor, battery life and mature analysis stack are unusually coherent. Buyers who resist subscriptions should look hard at Samsung or Ultrahuman before committing.
The catch
It is not a medical device for diagnosing disease, ring fit materially affects the experience, and long-term insight quality is harder to verify than the physical specifications. The membership also converts a simple ring into an ongoing service relationship.
Independent perspective: Wirecutter long-term review.
Hardware and membership specifications are manufacturer-stated and may change. Row & Ledger has not physically tested sleep-stage accuracy or long-term fit.