Oura Ring 4 Ceramic
Oura Ring 4 Ceramic is a ring from 2025, sitting in the premium band at an indicative $499.
It reads 18 of the 33 signals this comparison tracks. Nothing at all from body composition. Rarer readings it does take: cardiovascular age and sleep efficiency.
By sensor class: 6 at high accuracy and 9 at consumer grade. That grade is my classification of the hardware, not a lab test. Those readings come from an optical heart rate sensor, an optical blood oxygen sensor, a skin temperature sensor and an accelerometer. Blood oxygen is measured through the night, not continuously through the day.
Its 5-8 days per charge are the longest of the 7 devices of its kind here that publish a figure. Rated 100m / WR100, fine for swimming. An Oura Membership subscription is required to use it.
Zirconia ceramic shell over the Ring 4 platform, October 2025. Same sensors and same measured signals as Ring 4.
Key specs
What it tracks
Heart & vitals
Sleep
Activity
Fitness
Sources
https://ouraring.com/store/rings/oura-ring-4-ceramichttps://techcrunch.com/2025/10/01/oura-ring-4-ceramic/
Buying for battery life? See every device ranked by battery life
Your wearable's data, read against your own normal
MyBodyAI reads COROS, Garmin, Oura, Polar and Withings by logging in, and Fitbit and Pixel Watch through Google Health. Older Garmin history comes from a data export. It learns how you usually sleep and what your resting heart rate usually is, and every day shows where you stand against yourself: recovery, sleep, load and immune scores, a biological age estimate and early warnings. Optional, and separate from this comparison.
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