Oura Ring 4 review: more sizes, slimmer body, redesigned app, and better battery life and auto workout detection, but needs a subscription and no charging case
Context & Ripple Effects
The review follows Oura’s October 2024 Ring 4 launch, which positioned the device around a slimmer fit, expanded sizing, sensing improvements, and a rebuilt app. This assessment tests whether those product changes translate into day-to-day value.
The central trade-off is not solely hardware: later coverage likewise found the Ring 4’s data and app strengths constrained by a paid subscription for core use. That makes the purchase proposition a combination of device design and ongoing service access.
First-order effects
- Ring 4 buyers get a broader range of fit options, a slimmer wearable, longer battery life, and more capable automatic workout detection, while accepting the absence of a charging case.
- Oura’s recurring subscription remains part of the effective product cost, even as the company improves the hardware and software experience.
Second-order effects
- Competing smart-ring makers face pressure to match comfort, battery performance, and low-friction activity tracking—not just add sensors—because fit and automation directly shape everyday use.
- The missing charging case leaves an opening for accessory and rival-device differentiation, while the subscription requirement makes upfront device pricing less comparable across the category.
Third-order effects
- If rings continue to improve passive sensing and automatic interpretation, competition will increasingly center on the quality of the software service layered on top of the sensor hardware.
- The category may split between premium recurring-revenue models and products that use ownership simplicity—such as fewer locked features or stronger included accessories—as a differentiator.
The trend: Smart rings are evolving from compact sensor hardware into subscription-backed health software products, where comfort, automation, and service terms jointly determine value.