Oura Ring 5 Review: Hands-On Data, New Features and Whether to Upgrade

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Oura announced the Ring 5 on May 28, 2026 and put it up for preorder the same day, with shipping starting June 4. I have worn an Oura ring daily for more than three years, across the Gen 3 and the Ring 4, alongside my Whoop and my Hume Band, so I want to give you a first read on what is new, what is mostly marketing and whether it is worth your money.

I do not have the Ring 5 on my finger yet. This first look is based on Oura's announced specs, my long history on the Oura platform, the published research on how accurate Oura actually is and the same-night testing I already do across multiple devices. I preordered the Ring 5 and my sizing kit has already arrived (more on that below). Once the ring ships I will wear it against my Oura Ring 4 and my Whoop on the same nights and update this review with real data. If you want my fully hands-on experience with the current ring in the meantime, my Oura Ring 4 review has three years of my own sleep and recovery data in it.

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What Is New in the Oura Ring 5

The headline is size. Oura is calling the Ring 5 the smallest smart ring in the world, and says it is about 40 percent smaller than the Ring 4. It measures 6.09 millimeters wide and 2.28 millimeters thick and weighs from about 2 grams, down from the Ring 4 at 7.99 millimeters wide, 2.88 millimeters thick and a minimum of 3.3 grams. Oura got there by redesigning the battery, sensors and internal architecture. For a category where the most common complaint I hear from women is that the ring feels chunky (and that's my own compliant as well), that matters more than any single new metric.

Durability got attention too, which I am glad to see. The Ring 4 was easy to scratch, especially during weight training and it is the reason Oura released the pricier Ceramic edition. The Ring 5 keeps the aerospace-grade titanium construction but adds a new physical vapor deposition coating that Oura says improves scratch resistance. It carries an IP68 rating and is water resistant to 100 meters, so showering, swimming and washing dishes are all fine.

The sensing system is where the engineering gets interesting. Battery life moves to six to nine days, up from five to eight on the Ring 4. Oura says the Ring 5's LEDs are about four times more powerful than the Ring 4's, paired with low-profile sensor domes that sit closer to the skin. Here is the counterintuitive part that other reviewers have flagged: the number of signal pathways actually dropped from 18 on the Ring 4 to 12 on the Ring 5. Oura's argument is that the stronger LEDs and the repositioned sensors more than make up for it, improving accuracy across a wider range of finger sizes and skin tones. That last point is genuinely useful for a female audience, since optical sensors have historically struggled with smaller fingers and a broader range of skin tones. Whether fewer pathways really do deliver better accuracy is something I want to see tested, not just asserted.

The bigger story, in my opinion, is the software. Oura is launching a feature set it calls Health Radar, and it is rolling those features out not just to the Ring 5 but to the Gen 3 and later, on both iOS and Android. I will come back to why that detail changes the whole upgrade math.

Oura Ring 5 vs Ring 4: Specs Compared

Here is how the two generations line up on the specs that actually change. I am building a full standalone Oura Ring 5 vs Ring 4 comparison with persona-based buying advice, and I will link it here as soon as it is live.

The Health Features That Actually Matter for Women

Most launch coverage will run through the new features as a checklist. I want to focus on the two that I think are genuinely meaningful for women in the menopause transition, because they target things that are both common and easy to miss.

Blood pressure: a study, not a feature yet

This is the one I most want to set straight, because a lot of the launch coverage is calling it a blood pressure feature and that is not what it is. What Oura actually shipped is the Blood Pressure Profile Study, an opt-in research study inside Oura Labs. Oura is clear that it is investigational, not a diagnostic tool, and not meant to detect, treat or monitor any illness. The point of it is to help Oura build a future feature that can flag possible signs of hypertension from your ring data.

A few things to know before you get excited. You have to opt in, and it is limited to people in the United States on the English app who are 22 or older and on a Gen 3 ring or newer. It is not open to you if you have a cardiac implant or are pregnant or within 12 weeks postpartum. It uses no cuff. It reads your heart rate, heart rate variability, sleep, activity and the shape of your pulse waves, pairs that with a short health questionnaire, and after about four weeks of consistent wear it gives you an estimate every 12 weeks of whether you show no, moderate or strong signs of hypertension.

I opted in, and right now mine simply says Calibrating, because it needs most nights across a four week window before it will say anything. So I cannot yet tell you how it reads against an actual cuff, which is the comparison that would matter. I will report back once it produces a profile. The underlying idea is sound, since a 2023 review in Current Hypertension Reports describes how overnight blood pressure patterns are linked to cardiovascular risk, and that risk climbs through the menopause transition. I just want to be honest that this is a research study in its early days, not a blood pressure monitor on your finger.

Nighttime breathing

The nighttime breathing feature gives you a 30-day rolling view of sleep-related breathing patterns and disturbances. I think this is the most underrated addition, because sleep-disordered breathing is badly underdiagnosed in women, and it gets more common after menopause.

The data here is striking. A study of 277 perimenopausal women published in Chest found that obstructive sleep apnea was common, independently associated with high blood pressure and arterial stiffness, and that not one of the women with it had been previously diagnosed. A review in Maturitas similarly notes that the prevalence and severity of sleep apnea in women rise across menopause. A ring will not diagnose apnea, but a 30-day breathing trend that prompts you to ask your doctor for a proper sleep study is a meaningful first step. If your sleep is already rocky in perimenopause, it is also worth getting the basics right first, which is why I wrote about magnesium for sleep.

GLP-1 insights, Oura Advisor and the rest

Oura also added GLP-1 insights that track weight and body changes alongside a medication timeline, which is timely given how many women in my audience are on these medications. The Ring 5 leans harder on AI too, with the Oura Advisor coaching feature and Oura's women's health insights front and center. There is also new live activity tracking with real-time pace and distance, better detection of low-motion activities like pilates, the option to connect a third-party heart rate monitor and an on-demand care feature that connects you with licensed physicians for an extra fee. I will test the ones I can once my ring arrives and report back on what is actually useful versus what is a tab you open once and forget.

Is the Oura Ring Accurate? What the Research Shows

The Ring 5's central claim is better accuracy from the redesigned sensors and stronger LEDs. I cannot verify the Ring 5's sensors until I have worn it, so for now I'll show you what independent research has found about the Oura platform up to this point. This is the baseline the new ring has to beat.

For heart rate and heart rate variability, a study comparing the Oura against a medical-grade ECG in the Journal of Medical Internet Research found that Oura accurately measured nocturnal heart rate and RMSSD, the most commonly used HRV metric, while some frequency-domain measures like the low-frequency to high-frequency ratio were less reliable. A more recent analysis in Sensors found that accurate HRV can be pulled from Oura's signal when data quality is high, which is exactly what the Ring 5's reengineered sensors are meant to improve.

For resting heart rate, a validation study in JMIR Formative Research found the Oura correlated very strongly with a reference monitor and underreported by only about one beat per minute, and it tracked sleep duration well. On sleep staging, a large validation of 440 nights against in-lab polysomnography published in Sensors reported about 96 percent accuracy for telling sleep from wake and about 79 percent for distinguishing light, deep and REM sleep. I will note that this last study was authored by Oura's own researchers, so I weight it alongside the independent work rather than on its own.

The honest read is that Oura is strong for resting and overnight heart rate and for sleep duration, solid for sleep staging and RMSSD, and weaker for some advanced HRV measures (Elonga is better for that). None of this is a medical device. The nighttime breathing feature shows trends to watch rather than diagnoses, and the blood pressure work is still an opt-in research study, not a reading. Whether the Ring 5's sensors actually narrow these gaps is one of the first things I will test once I am wearing it against my other devices.

Update: My First Two Nights With the Oura Ring 5

The ring arrived, so this is no longer a specs-only first look. I have now worn the Oura Ring 5 for two nights right alongside my Oura Ring 4, same body, same nights, so I can tell you how the numbers line up. One note on method before the data: I wore the Ring 4 on my ring finger and the Ring 5 on my index finger on the same hand, which is the finger Oura recommended for years. Different fingers can read slightly differently, so keep that in mind on the small gaps below. Two nights is an early read, not a final verdict. I will give a fuller accuracy verdict after about two weeks, once the Ring 5 finishes calibrating.

The two rings agree closely

This is the part that matters most if you are thinking about upgrading from an older ring. On the night both rings captured fully, they landed almost on top of each other. Total sleep was within one minute, the sleep score was within one point, and resting heart rate was within one beat. After three years of trusting my Ring 4 data, that is exactly the reassurance I wanted to see.

Sleep last night, Ring 5 on the left and Ring 4 on the right. Total sleep landed within a minute.

The overnight stage graphs, Ring 5 left and Ring 4 right, drew nearly the same shape.

Core metrics, Ring 5 left and Ring 4 right. The HRV gap is the one to watch.

Where they differ, honestly

Two small things stood out, and neither is a dealbreaker. First, HRV read a few milliseconds lower on the Ring 5 both nights, 18 against 21 last night and 22 against 25 the night before. The direction was consistent, the size was small, and it could easily be the finger difference, so I want more nights before I call it anything. Second, the sleep staging did not match exactly. The Ring 5 logged a bit more deep sleep and slightly less REM. Staging is the least precise thing any of these rings does, so a little disagreement is normal and worth saying plainly.

The bigger caveat is that the longer-horizon numbers are not ready yet. The Ring 5 still says it needs about 14 nights of data before it will show cardiovascular age, and its early VO2 max reads Fair at 26, while my broken-in Ring 4 already shows Peak at 34 and a cardiovascular age several years younger. That is not the Ring 5 being wrong, it is the Ring 5 still learning my baseline. Do not judge those metrics on a new ring for the first couple of weeks.

The Ring 5 (left) still needs about two weeks before it shows cardiovascular age and VO2 max. My settled Ring 4 (right) already does.

Nighttime breathing worked from night one

Unlike the blood pressure study, nighttime breathing is a real shipped feature, and it produced data right away. Both nights came back Steady with no significant disturbances, and average oxygen saturation held at 95 percent. For women in the menopause transition, when sleep-disordered breathing becomes more common, this is one of the more useful additions.

The fit, with one honest reservation

The Ring 5 is clearly thinner and more comfortable than the Ring 4. You can see the difference next to each other on my hand. My one reservation after two days is the index finger placement. It is the finger Oura recommended for years, but it catches on things more than I expected during the day. I am going to keep testing where it sits best before I make a final call on comfort.

It is too early to say anything useful about battery life after only two nights, so I am holding that until I have a full cycle or two to report. I will update this section with real battery numbers, the blood pressure profile once it finishes calibrating, and a final accuracy verdict after about two weeks of side by side data.

The Honest Take: Should You Upgrade From the Ring 4?

Here is the part the launch headlines skip…the marquee software features, Health Radar, nighttime breathing, GLP-1 insights and live activity, plus access to the opt-in blood pressure study, are rolling out to the Gen 3 and later, not just the Ring 5. If you already own a Ring 4, you are getting almost everything new for free through a software update.

So the real upgrade question is narrow. Are the smaller body, the slightly longer battery, the tougher coating and the reengineered sensors worth $399 to $499 when the software is coming to your current ring anyway? For most Ring 4 owners, my honest answer is no, not yet, but that's before wearing the new ring. If your ring is chunky and bothers you, if it has scratched up, if the battery life has degraded over years of use or if you have a smaller finger and the fit has never felt right, those are the legitimate reasons to upgrade now. If you are on a Gen 3 or older, the case is stronger because you get the smaller hardware, the better sensors and the new software all at once.

This is the same lens I bring to every device. I wear NAD patches and tell you that I do not notice a subjective difference. I will give you the same straight read here once I have worn the Ring 5 against my Ring 4 on the same nights. I even ordered the Oura 5 for a different finger so I can wear them at the same time. I just need to figure out if the software will allow that side by side comparison or if I'll need a different account for that.

Price, Sizing and Membership

The Ring 5 starts at $399 for Silver or Black and is $499 for Brushed Silver, Deep Rose, Gold and Stealth. That is a $50 jump over the Ring 4's $349 starting price. The charging case is a separate $99 and holds multiple full charges, which is genuinely handy for travel. The membership has not changed at $5.99 a month or $69.99 a year, and you do need it for the ring to be useful, which remains my biggest ongoing gripe with Oura compared to subscription-free rings like RingConn.

How Ring 5 sizing differs, and why to re-size

This is the step people skip and then regret. Because the Ring 5 has a brand new, smaller body, your old Oura size does not always carry over. At least that's what they say. I found the new sizing kit to be comparable to my old one. Oura is recommending the Ring 5 sizing kit even for existing members and early reviewers have already reported mixed results, with some staying the same size and others needing to go up a size. My own sizing kit just arrived, so here is a real look at it.

I am sizing the Ring 5 on my index finger right now, and you can see in the photo below that I am wearing my Oura Ring 4 and my Whoop at the same time. That is not just for the photo. Those are the two devices I will run the Ring 5 against on the same nights once it ships, so I can tell you how the new sensors actually compare rather than how Oura says they compare.

Even though they seem very similar and that was my experience, do not assume your Ring 4 size carries over. Order the sizing kit, wear the plastic sizer for a full day that includes a workout and a night of sleep, since your fingers change size with activity and temperature and size to the finger you will actually wear it on. If you are shopping the premium finishes purely for looks, the $100 premium is real money over the life of the device once you add the membership. I lean toward the Silver or Black at $399 unless a specific finish makes you genuinely happier to wear it every day, because consistent wear is what makes any of this data useful.

How It Fits With My Other Wearables

I do not test devices in isolation. At various times I wear my Oura, my Whoop, my Hume Band and my Elonga at the same time, which is the only real way to see where they agree and where they drift.

Once the Ring 5 ships I will wear it against my Oura Ring 4 and my Whoop on the same nights, the same two devices you can see in the sizing photo above, so I can tell you whether the reengineered sensors actually change the sleep and heart rate numbers or just the marketing copy. If you want to see how I currently think about stacking these devices, my Whoop vs Oura comparison, my Elonga review and my best fitness tracker for women guide lay out the tradeoffs.

One practical note for anyone like me who is not on an iPhone. Oura works on both iOS and Android, and I have used it on Android the whole time, so the Ring 5 and the new software are not iPhone-only. I also track my actual biomarkers quarterly, so I can sanity check what the wearables suggest against real blood work. If you are curious how that works, I wrote about it in my Function Health review and Hundred Health review.

Who Should Buy the Oura Ring 5

My Preliminary Verdict

The Oura Ring 5 looks like a smart, focused update. The smaller body is the real upgrade, the tougher coating and the sensor and battery improvements are welcome and the new health features are well chosen for exactly the things women in midlife tend to overlook. The catch is that the best of the software is coming to existing rings, so the hardware has to justify itself on fit, comfort and durability alone. For new buyers and people on older rings, I think it is an easy yes. For Ring 4 owners, I would wait unless the smaller size or the scratch resistance solves a real problem for you.

I will update this review with my own data after I have worn it against my other devices for a couple of weeks. You can order the Oura Ring 5 here if you want to be in the first wave.