Oura Ring 4 Smart Ring
£244
|The Oura Ring 4 is a titanium smart ring that tracks sleep blood oxygen, heart rate, temperature and movement through recessed interior sensors. It is built for round-the-clock wear, which is handy when another glowing rectangle on the bedside table feels like administrative failure.
Prices correct as of: 20/08/2026 12:36
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At a glance
One-line verdict
This smart ring turns sleep and activity into discreet data rather than wrist clutter, provided you accept sizing matters more than your usual jewellery guesswork.
Best for
People who want sleep, heart-rate and activity tracking without adding another screen-heavy watch to the daily uniform.
Skip it if
Skip it if you need a medical device, dislike wearing rings, or cannot be bothered to get the sizing right before committing.
The full picture
The Oura Ring 4 exists because modern life has somehow made sleep a project plan. A watch can track it, of course, but a watch also lights up, buzzes, demands charging, and occasionally makes an evening out look like a hostage situation with a fitness app. This is the quieter proposition: a titanium ring that gathers sleep, heart-rate, blood-oxygen, temperature and movement data without bringing another screen to bed.
We think that restraint is the entire point. The Ring 4 is designed for 24/7 wear and puts its sensors behind a recessed interior, so the tech is not presented as a miniature dashboard strapped to a limb. At 7.9 mm wide and about 2.88 mm thick, it remains an obvious ring rather than an invisible one; still, its stated 3.3-to-5.2-gram weight is admirably low for something carrying this much electronics.
This is also a rare gadget whose boring practical details support the fantasy. Oura states a typical battery life of five to eight days, and rates it to 100 metres of water resistance for showers, baths, swimming, saunas and water sports. A device intended to notice your routine should not demand a small ceremony every time you encounter a sink.
There is one important dose of adult supervision: it is not a medical device and is not intended to diagnose or treat conditions. Buy it as a personal tracking tool, not a titanium oracle. Get the sizing kit involved, too; the ring, and its included corded charger, are size-specific. Jewellery was already complicated enough without firmware.
The Irresistible
- A fully titanium smart ring with recessed interior sensors makes a persuasive case for tracking without turning your wrist into a notification depot.
- It records several genuinely useful signals: sleep blood oxygen, heart rate, temperature, movement and activity.
- Oura states 5 to 8 days of typical battery life, which means charging can be an occasional chore rather than a daily ritual.
The Clever Part
- It is designed for 24/7 wear and is water resistant to 100 metres, including suitability for showers, swimming, snorkelling, saunas and water sports.
- Sizes run from 4 to 15, covering a far more realistic range of human hands than the usual gadget-world assumption that everyone has identical fingers.
- Bluetooth Low Energy connects it to the Oura App, which also handles automatic firmware updates.
The Fine Print
- Charging typically takes 20 to 80 minutes, and the included charger needs its own separate power source; tiny gadgets remain oddly dependent on cables.
- Its 7.9 mm width and roughly 2.88 mm thickness mean this is still a noticeable ring, not a secret agent disguised as jewellery.
The Reality Check
- The Oura Ring 4 is not a medical device and must not be treated as one; anyone seeking diagnosis or treatment information is asking a consumer wearable to do a job it explicitly does not do.
- Size is a hard commitment: the charger is size-specific, so use the Oura Ring 4 sizing kit rather than trusting the finger-measuring folklore of a rushed evening.
Buyer questions answered
How long does the Oura Ring 4 battery last?
Oura states that the Oura Ring 4 typically provides 5 to 8 days of battery life, depending on ring size, settings, enabled features, activity, battery age and usage. Charging typically takes 20 to 80 minutes depending on the starting charge level.
What does the Oura Ring 4 track?
The Oura Ring 4 uses red and infrared LEDs for blood-oxygen measurement during sleep, green and infrared PPG sensors for heart-rate measurements, a digital temperature sensor, and an accelerometer for movement and activity. That is a lot of quiet bookkeeping for something smaller than most biscuits.
Does the Oura Ring 4 work with Android and iPhone?
Yes, the supplied listing information states that the Oura Ring 4 is compatible with Android and iOS. It uses Bluetooth Low Energy connectivity and supports automatic firmware updates through the Oura App.
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