Oura Ring 4 Smart Ring
$320
|The Oura Ring 4 is a titanium smart ring designed for round-the-clock sleep, heart-rate, movement, and blood-oxygen data. Recessed interior sensors and a 5-to-8-day stated battery life make it a notably discreet alternative to turning your wrist into a tiny dashboard.
Prices correct as of: 20/08/2026 12:36
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At a glance
One-line verdict
This smart ring puts sleep and heart-rate tracking in a normal-looking titanium band, provided you can accept that your finger now has a charging schedule.
Best for
People who want sleep, activity, heart-rate, and blood-oxygen tracking in a small wearable built for 24/7 use.
Skip it if
Skip it if you need medical-grade diagnosis or dislike sizing-dependent accessories with a dedicated charger.
The full picture
The Oura Ring 4 exists for people who want to know what happened overnight without wearing a miniature office building on their wrist. Sleep, heart rate, movement, temperature, and blood-oxygen measurement all sit inside a titanium ring, which is either wonderfully civilized or proof that we have begun outsourcing basic self-awareness to jewelry. Probably both.
We think the appeal is unusually easy to grasp. A ring is already part of many people’s daily uniform; the Oura Ring 4 adds recessed sensors rather than an obvious sci-fi bump on the inside. At 7.9 mm wide and about 2.88 mm thick, it is still a piece of hardware, not a magical wisp, but its stated 3.3-to-5.2-gram weight keeps the proposition mercifully small.
The practical case gets stronger because Oura says it is designed for 24/7 wear. It can go through showers, baths, swimming, snorkeling, saunas, and water sports, and its stated 5-to-8-day battery life avoids the nightly charger ritual that makes some wearables suspiciously good at monitoring their own time on the nightstand.
There is a grown-up caveat beneath the polished titanium. This is not a medical device and is not intended to diagnose or treat any condition. Buy it because you value a compact record of sleep and activity, not because you want a tiny ring to replace professional care. That boundary is less glamorous than a glowing readiness score, but considerably more useful.
The Irresistible
- Recessed interior sensors are the point: the Oura Ring 4 packages sleep, heart-rate, movement, temperature, and overnight blood-oxygen measurement into a ring rather than another wrist-mounted notification billboard.
- Oura states a typical 5-to-8-day battery life, a rare bit of mercy for anyone already maintaining a small zoo of charging cables.
- The fully titanium design is built for 24/7 wear, with water resistance to 100 meters (328 feet) and stated suitability for sauna use, swimming, snorkeling, and water sports.
The Clever Part
- It comes in sizes 4 through 15, and the dedicated Ring 4 sizing kit covers that full range. Fingers, as it turns out, stubbornly refuse standardization.
- Bluetooth Low Energy connects it to the Oura App, which also supports automatic firmware updates.
- A digital temperature sensor and accelerometer broaden the data beyond heart-rate measurements, covering temperature and movement/activity inputs.
- Oura states that the non-allergenic titanium inner surface is BPA-free, a sensible detail for something intended to remain on your finger for most of the day.
The Fine Print
- Charging typically takes 20 to 80 minutes, and the supplied charger is size-specific, corded, and needs a separate power source. Lose the right charger and the ring’s elegant minimalism becomes an annoyingly specific scavenger hunt.
- Battery life is not a fixed promise: Oura says it varies by ring size, settings, feature configuration, activity, battery age, and usage.
The Reality Check
- The Oura Ring 4 is not a medical device and is not intended to diagnose, treat, cure, prevent, or mitigate disease or any condition. Anyone seeking clinical answers should not mistake a very polished wearable for a clinician.
Buyer questions answered
How long does the Oura Ring 4 battery last?
The Oura Ring 4 typically provides 5 to 8 days of battery life. Actual battery life varies by ring size, app settings, feature configuration, activity, battery age, and usage.
Does the Oura Ring 4 track sleep and heart rate?
Yes, the Oura Ring 4 tracks sleep and heart rate. It also measures blood oxygen during sleep and uses a digital temperature sensor and accelerometer for movement and activity data.
What sizes is the Oura Ring 4 available in?
The Oura Ring 4 is available in sizes 4 through 15. Oura’s Ring 4 sizing kit is intended for sizes 4 through 15, and the charger is size-specific.
How long does the Oura Ring 4 take to charge?
The Oura Ring 4 typically charges in 20 to 80 minutes. Charging time depends on the ring’s starting charge level, and the included size-specific corded charger and USB cable require a separate power source.
Can the Oura Ring 4 be worn in water?
Yes, the Oura Ring 4 is water resistant to 100 meters (328 feet). It is suitable for showers, baths, swimming, snorkeling, saunas, and water sports, but not diving.
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