Oura Ring 5 Review: The Smallest Smart Ring, and the Membership Behind It

Oura says the Ring 5 takes up 40 percent less volume than the Ring 4. It measures 6.09 mm wide and 2.28 mm thick, and weighs from 2 grams depending on size. A plain titanium wedding band is usually between 4 mm and 8 mm wide, so the Ring 5 now falls inside the range people already wear without thinking about it. Earlier smart rings caught on pockets, pressed into the neighboring finger when you made a fist, and dug in when you carried a bag. Samuel Gibbs wore a size 8 for several weeks for the Guardian and reports that the Ring 5 avoids all three. The black finish still looked new at the end. One reviewer over a few weeks is thin evidence on durability, but it is the only sustained account available here. The case is titanium with a scratch-resistant PVD coating, and the interior is titanium too, which matters for anyone who reacts to nickel. The ring comes in six finishes. The sensors now sit in low-profile domes on the inner surface, visible in the images here as three small windows. Gibbs notes they protrude slightly but are not noticeable in wear. A ring you forget you are wearing is also a ring you can forget to take off. Oura rates the Ring 5 to 100 meters, so the risk to worry about is losing it.

Red and infrared LEDs read blood oxygen. Green and infrared LEDs alternate for heart rate, heart rate variability and respiration rate. A digital sensor follows temperature trends, and an accelerometer handles movement. From those four inputs Oura derives more than 50 metrics across sleep, activity, readiness, stress, heart health and women's health. Oura's product page claims 99 percent heart rate correlation with ECG. It also claims 95 percent sleep staging accuracy compared with a clinical sleep lab. That sleep figure is footnoted to a 2021 paper in Sensors that compared an earlier Oura ring with polysomnography, and the Ring 5 was not part of it. The heart rate figure links to Oura's own accuracy blog post. Neither is an independent test of this generation, so both are recorded here as Oura's claims. Resting measurements taken overnight, when your hand is still, are the strongest case for this form factor, and that is less in doubt than the percentages. Readings taken while you are moving fast are the weakest, which is why the workout side of the ring leans on your phone. Gibbs found the same thing. The Ring 5 detects more than 40 activity types automatically, but it depends on the phone in your pocket for distance, pace and route. It does not replace a running watch. Read the scores as ranked signals, not clinical measurements. A readiness score of 88 is Oura's way of saying that today looks better than your own recent baseline. It is not a diagnosis, and Oura does not present it as one.

The ring collects the data, and the membership pays for the app's interpretation of it. Without a membership, the Oura App keeps only basic current metrics. Scores, trends, long-term analysis, Symptom Radar and the Oura Advisor chatbot all need the subscription. Oura includes one free month with a new ring and publishes the ongoing monthly price on its membership page. The current figure is in the offers block on this page, because subscription prices change. The app, the strongest part of the package, has three views. Today surfaces one thing worth acting on, such as a resting heart rate above your baseline. Vitals breaks out seven categories and shows your normal range next to today's figure. My Health takes the long view, ranking sleep, cumulative stress and heart health on a scale from needs care to thriving. Gibbs describes the analysis as comprehensible without a statistics background and praises the explanations attached to each metric in particular. Oura Advisor is a chatbot built on your own data. It cannot tell you the weather and will not answer questions outside your health record, but Gibbs found it useful for spotting long-term trends. The cost over time is the most important thing to understand before buying. The ring is a one-time cost and the membership is not. Over three years the membership can approach the price of the ring itself. If you stop paying, the hardware keeps recording but the app stops explaining.

Compatibility is narrower than the marketing suggests, and it depends on both your phone and your country. Oura's support documentation gives the exact requirements: iOS 16 or higher, or Android 11 or higher with Google Play services, on a phone that supports Bluetooth 5.0. Android 11 arrived in 2020, so most phones in current use qualify. A Huawei handset without Google Play services does not, and neither does an older tablet kept as a bedside device, so check this before buying. Several of the newer features roll out one market at a time. Oura's announcement says Blood Pressure Signals reaches the United States, India and the United Arab Emirates first. Gibbs notes that Health Radar, which adds overnight blood pressure and breathing disturbance monitoring, launched in the United States in June. The app interface is available in more than twenty languages, so language is less of a barrier than features are. Two people buying the same ring in different countries end up with different products. A buyer outside the launch markets gets the hardware and the core analysis, and waits for the rest. Oura has not published a dated rollout schedule that could be verified here, or said when a given market gets a given feature. On the data side, the ring stores readings and syncs over Bluetooth Low Energy. Firmware updates arrive automatically through the app, and the ring supports an airplane mode for anyone who would rather it stopped transmitting.

Oura rates the Ring 5 at six to nine days on a charge, and the range follows ring size. A larger ring has more room for cells, so battery life rises with size. A size 6 is near the bottom of that range and a size 13 near the top. The only independent figure here comes from the Guardian. Gibbs measured a size 8, the third smallest available, at just short of eight days, and described that as roughly two days more than the equivalent Ring 4. That result is comfortably inside Oura's range, which suggests the claim is not stretched. The box includes a size-specific charging dock and a USB-C cable. Oura quotes about 80 minutes for a full charge, and Gibbs recorded under 90 minutes, so the two agree closely. A charging case is sold separately. Oura says it holds about a month of additional battery and can put a full day back into the ring in ten minutes. Gibbs puts the case at up to five full charges. A daily top-up suits this ring better than a weekly charge. Ten minutes on the dock while you shower is enough to keep it permanently ahead. Topping up that way also avoids the one real gap in the ring's coverage, the night it spends off your finger.

Sizing and the end of the ring's life are both easy to miss at the point of purchase. Oura's sizing page lists the Ring 5 in sizes 6 to 13. The Ring 4 ran from 4 to 15, so that is a real narrowing at both ends. Oura also says the redesigned interior fits differently from the Ring 4, so a Ring 4 owner should size again with the Ring 5 guide before ordering. Oura supplies a sizing kit of plastic replicas, and Gibbs recommends wearing one for several days, because finger size moves with temperature and time of day. Fit affects more than comfort. A loose ring gives worse data, because the sensors need consistent skin contact. The Ring 5 cannot be repaired, and its battery cannot be replaced. Gibbs flags this and deducts a star for it. When a sealed lithium cell stops holding a useful charge, and every one eventually does, the ring is finished. Oura offers free recycling, which handles disposal responsibly but does not bring the ring back. Gibbs also notes the ring contains no recycled material. For a titanium band that looks like jewelry, that is an odd proposition, because the band is built to outlast you and the electronics inside it are not. If you are choosing between this and a smartwatch, note that many smartwatches do have batteries that can be replaced through a service channel. Factor a replacement cycle into the cost. Our scoring method explains how a limitation like this feeds into the final figure.