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: 7 at high accuracy and 6 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
Turn a supported wearable into daily health scores
MyBodyAI reads Fitbit, Oura, Polar and Withings by logging in, and Garmin from a data export, then builds daily recovery, sleep, load and immune scores, a biological age estimate, and early warnings. Optional, and separate from this comparison.
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