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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchOura Ring 4 can still be worth buying in 2026 if its verified price is meaningfully below Ring 5 or you need a size Ring 5 does not offer. Ring 5 is now Oura’s newest generation and is physically smaller, while Ring 4 retains a broader size range and a substantial sleep-and-wellness feature set with active membership.
Before choosing, compare current prices in your country, include membership in the total cost, and use the sizing kit for the generation you plan to buy. The evidence here does not establish that either ring is universally more accurate in independent real-world use.
Key takeaways
- Oura announced Ring 5 on May 28, 2026; its support documentation identifies it as the newest generation.
- Ring 4 is 7.9 mm wide and about 2.88 mm thick, and is offered in sizes 4–15. Ring 5 is 6.09 mm wide and 2.28 mm thick, and is offered in sizes 6–13, according to Oura.
- Oura says new Ring 4 units typically last five to eight days per charge, under specified test conditions; actual battery life varies with use and battery age.
- Oura lists US membership at $5.99 per month or $69.99 per year before tax. Prices and terms vary by region and can change.
- Ring 4 is designed for passive sleep, recovery, and wellness tracking, not as a substitute for a smartwatch, GPS sports watch, or medical device.
What is Oura Ring 4 designed to do?
Oura Ring 4 is a screenless titanium smart ring designed for day-and-night wellness tracking. Bluetooth Low Energy sends its measurements to the Oura App, where active members can access sleep analysis, heart-rate and temperature tracking, stress and activity features, and other health-related views.
According to Oura’s Ring 4 documentation, its sensors include red and infrared LEDs for blood-oxygen sensing, green and infrared photoplethysmography sensors for heart rate and related measures, a temperature sensor, and an accelerometer.
#1 Best Overall
- 【Size Before You Buy】Before purchasing the Milavan Smart Ring, we recommend referring to the size chart and carefully measuring your finger circumference. This helps ensure a comfortable fit and avoid unnecessary returns or exchanges
- 【Wellness Tracking】The slim ring features advanced 4.0 sensors that automatically track your heart rate every 30 minutes while worn. Daily data is available in the app for reference only and is not intended for medical use
- 【Intelligent Sleep Tracker】The fitness ring automatically tracks your sleep quality, including deep and light sleep, REM (eye movement), and awake periods. You can view all sleep data anytime in the app for daily reference
- 【8 Sports Modes Tracking】Supports 8 sports modes, including Running, Cycling, Jump Rope, Walking, Hiking, Yoga, Dancing, and Golf. View workout duration, steps, heart rate, speed, calories burned, distance, and other activity data in the app
- 【Stylish Fitness Companion】Featuring a slim 2mm profile and a specially polished inner surface, this smart ring is designed for comfortable all-day wear and most sports activities. View detailed workout data in the app after selecting a sport mode
The central idea is longitudinal context rather than occasional spot checks. Wearing the ring overnight and during the day gives the app repeated signals to help show patterns in sleep, recovery, stress, activity, temperature, and daily routines. That makes Ring 4 more compelling as a sleep-and-recovery wearable than as a miniature fitness watch.
What are Oura Ring 4’s key specifications?
Oura describes Ring 4 as a fully titanium ring with recessed interior sensors. The specifications below are manufacturer-listed figures; battery performance depends on usage and test conditions.
| Specification | Oura Ring 4 |
|---|---|
| Sizes | 4–15 |
| Width | 7.9 mm |
| Thickness | About 2.88 mm |
| Battery life | Typically five to eight days for new units under Oura’s stated test conditions |
| Typical charging time | 20–80 minutes, depending on starting charge |
| Construction | Fully titanium design with recessed interior sensors |
| Phone compatibility | iOS and Android |
| Included charging equipment | Size-specific charger and USB-C cable, according to Oura’s product page |
Oura’s Ring 4 battery documentation gives the five-to-eight-day range and says its controlled estimate used new, unworn rings in sizes 8–10, eight hours of sleep tracking, one hour per day of activity heart-rate capture, and blood-oxygen sensing disabled. Oura warns that more activity heart-rate capture and blood-oxygen sensing can shorten runtime; battery capacity also declines with age. These are manufacturer figures, not an independent battery test.
Oura says sizes differ between generations and recommends using the sizing kit for the specific generation you intend to buy. Its Ring 4 specifications and sizing guidance are available in Oura’s Ring 4 documentation.
How accurate is Oura Ring 4?
Ring 4 uses Smart Sensing, which Oura says selects signal paths according to the wearer’s finger characteristics, skin tone, and activity. This describes the manufacturer’s sensing approach; it does not establish that every measurement is accurate for every person or situation.
Oura’s Smart Sensing explanation discusses its sensing system and comparison work. The evidence summarized here does not establish a universal clinical-accuracy result or prove that Ring 4 is more or less accurate than Ring 5 in independent real-world use.
Ring 4 can provide useful wellness trends, but its readings should not be treated as a diagnosis. Oura’s product-safety guidance says the ring is not a medical device and is not intended to diagnose, treat, cure, or prevent disease.
Why is sleep the Oura Ring 4’s strongest use case?
Sleep is Ring 4’s strongest use case because the ring collects overnight signals passively and combines repeated measurements with trend views in the Oura App.
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With active membership, Oura lists detailed sleep analysis, 24/7 heart rate, temperature monitoring, blood-oxygen sensing, and other features. The value is not any single nightly score; it is seeing how sleep timing, recovery, activity, travel, and changing routines relate to personal trends over time.
Rank #2
- 【Check the Size Before Purchase】 Before buying the BIEMHA Smart Ring, we strongly suggest that you refer to the size chart and carefully measure the circumference of your finger. This will ensure you get the most comfortable wearing experience and easily avoid any unnecessary returns or exchanges.
- 【Real‑time Accurate Sleep & Fitness Monitoring】 BIEMHA smart ring tracks your sleep quality and daily activities in real time. With advanced sensors, it provides precise data about your sleep cycle, helping you optimize rest and recovery. Whether you are tracking steps, calories or exercise performance, this smart ring can provide you with the most accurate insights to support your fitness goals and enhance your overall health.It is a good choice for family and friends.
- 【Health Monitoring】The BIEMHA ring features advanced 4.0 sensors that automatically measure your heart rate every 30 min when worn. It provides continuous health tracking and comprehensive wellness management all day.
- 【2‑3 Day Battery Life】 With a 2‑3 day battery life, the BIEMHA smart ring ensures continuous health monitoring without frequent charging. When used with the smart charging case, the usage time can even exceed 5 days. Whether you are tracking sleep patterns or fitness activities, you can count on long‑lasting performance without constant interruptions.
- 【80‑meter Waterproof, Suitable for Various Scenarios】 The BIEMHA Smart Ring has excellent waterproof performance, with a waterproof depth of up to 80 meters. Whether it's for daily wear, an intense workout session or a pleasant swimming time, it can handle it with ease. What's more, even if you have sensitive skin, you can still enjoy an extremely comfortable wearing experience when wearing this ring.
This emphasis suits readers who want to understand sleep and recovery without wearing a watch to bed. The ring has no display or notifications; the app provides the interpretation later.
Can Oura Ring 4 replace a smartwatch for workouts?
Ring 4 tracks activity and movement, but it should not replace a dedicated GPS running watch or a smartwatch when you need live workout interaction.
Ring 4 has no screen, buttons, or on-ring workout interface. Runners who need routes, live pace, heart-rate zones, interval controls, maps, or immediate feedback will generally be better served by a watch. Ring 4 can complement one by supplying passive sleep and wellness context while the watch handles exercise interaction.
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This division of labor is more useful than calling Ring 4 an all-purpose fitness tracker: its advantage is low-interaction, continuous wear, while a smartwatch shows and controls information during an activity.
How long does Oura Ring 4 battery last?
Oura says new Ring 4 units typically last five to eight days and take 20–80 minutes to charge, depending on starting charge. The range comes from Oura’s controlled test conditions, including sizes 8–10, eight hours of sleep tracking, one hour a day of activity heart-rate capture, and blood-oxygen sensing disabled. More sensing and activity heart-rate capture can reduce battery life.
Actual runtime also varies with settings, usage, and battery age. Treat the range as a manufacturer estimate rather than a promise that every wearer will reach eight days.
Oura states that a size-specific charger and USB-C cable are included with Ring 4. Check Oura’s current product and accessory information before buying a replacement charger or travel accessory; compatibility and availability should not be assumed across generations.
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Oura lists Ring 4 as water-resistant and suitable for everyday water exposure, including swimming, subject to its product guidance. Check Oura’s current Ring 4 documentation for the full use limitations rather than assuming that the ring’s water resistance applies to its charger or other accessories.
Does Oura Ring 4 require a subscription?
Oura says active membership is required for the full app experience; use without membership is limited. With membership, Oura lists detailed sleep analysis, 24/7 heart rate, temperature monitoring, blood-oxygen sensing, Daytime Stress, activity features, heart-health measures, metabolic-health features, Oura Labs, resilience, reports, and women’s-health features.
Rank #3
- THE WORLD’S SMALLEST SMART RING - 40% smaller than the previous generation, Oura Ring 5 is thinner, lighter and smaller than ever. The updated all-titanium design is more scratch-resistant and comfortable than ever
- SIZING IS ESSENTIAL - Oura Ring 5 uses unique sizing different from standard jewelry rings and other Oura Ring generations; use the Oura Ring 5 Sizing Kit to find your perfect fit before purchasing
- EVERYDAY HEALTH SENSING - Oura tracks over 50 health metrics, including sleep, activity, stress, heart health, metabolic health and women’s health metrics. Oura seamlessly integrates with over 40 apps including Natural Cycles, Strava, & more
- OURA MEMBERSHIP - First month of membership is included with purchase, for new members only. Subscription is 5.99/mo afterwards. Membership is tied to your account via the Oura App, not your physical ring
- REBUILT FOR GREATER ACCURACY - Oura Ring 5 has been re-engineered and reconfigured, providing more precise personal health data. Larger, smarter sensors bring research-grade accuracy—all in Oura’s smallest form factor yet
Oura’s current product result lists US membership at $5.99 per month or $69.99 per year before tax. Regional prices and trial terms differ and may change, so check the buyer’s local Oura checkout terms.
| Cost consideration | What to check |
|---|---|
| Ring hardware | Verify current price by country, finish, size, seller, and generation. |
| Membership | Include the recurring fee in the total cost; US prices listed by Oura are $5.99 monthly or $69.99 annually before tax. |
| Introductory terms | Check the current offer and terms for the buyer’s region at checkout. |
| Accessories | Ring 4 includes a size-specific charger and USB-C cable, according to Oura; verify compatibility before purchasing extras. |
Compare a no-subscription alternative against Ring 4’s hardware price plus the membership cost over the period you expect to own it. The membership price is regional and volatile, so verify it before publication or purchase.
Is Oura Ring 4 still worth buying now that Ring 5 is out?
Ring 4 is a sensible buy when its verified price is meaningfully lower than Ring 5 or its broader size range better fits you. Ring 5 is Oura’s newest generation, announced May 28, 2026, and is the more relevant option if you prioritize a smaller ring.
| Decision factor | Oura Ring 4 | Oura Ring 5 |
|---|---|---|
| Generation | Previous Oura generation | Newest Oura generation, announced May 28, 2026 |
| Width and thickness | 7.9 mm wide; about 2.88 mm thick | 6.09 mm wide; 2.28 mm thick |
| Available sizes | 4–15 | 6–13 |
| Sensor layout listed by Oura | Three photodetectors; up to one week of data storage | Two photodetectors and two triple-LED arrays; up to three days of data storage |
| Best reason to choose | Verified lower price or a needed size outside Ring 5’s listed range | Smaller form factor and newer generation |
Specifications in this comparison come from Oura’s Ring 5 announcement and current product support documentation. These specifications alone do not prove which ring is more accurate or more comfortable in independent real-world use.
There is no reliable current price comparison here across all finishes, countries, sellers, or Ring 5 offers. Check live local prices before deciding. As a dated UK example, T3 reported on October 5, 2026 that Ring 4 was available in a £199 Prime promotion and described it as easy to recommend at that price; this is not a guaranteed or current price elsewhere, and membership still applies after any introductory period.
The practical decision is straightforward: choose Ring 4 if a verified discount makes it a better value or you need one of its additional sizes; choose Ring 5 if its smaller dimensions matter enough to justify the price difference. The research available here does not establish a strong performance-based upgrade case for existing Ring 4 owners.
What are Oura Ring 4’s main strengths and weaknesses?
| Strengths | Weaknesses |
|---|---|
| Passive sleep and recovery tracking in a screenless form factor | Full app experience requires active membership |
| Oura lists sleep, heart-rate, temperature, stress, activity, and other wellness features with membership | No screen, buttons, notifications, or on-ring controls |
| Fully titanium construction with recessed interior sensors | Not designed for live workout metrics, route tracking, or GPS-based training |
| Sizes 4–15 and iOS and Android support | Ring 5 is narrower and is offered in a different size range |
| Manufacturer-stated five-to-eight-day battery life under specified test conditions | Battery life varies with sensing, activity, use, and battery age |
Who should buy Oura Ring 4?
Buy Ring 4 if sleep, recovery, stress, temperature, and long-term wellness trends matter more to you than notifications or live workout controls; you are comfortable wearing a ring overnight; and you accept the ongoing membership cost.
It is especially sensible when a verified discount makes it clearly cheaper than Ring 5, or when you need a size outside Ring 5’s listed 6–13 range. Use the Oura Ring 4 Sizing Kit and confirm fit before ordering; Oura says sizing differs between generations.
Choose Ring 5 if you value its smaller dimensions and can justify the price difference. Choose a smartwatch or GPS sports watch instead if your priorities are live pace, routes, maps, workout controls, or on-device interaction. Ring 4 can complement such a watch, but is not designed to replace it.
Rank #4
- 【Check the Size Before Purchase】 Before buying the BIEMHA Smart Ring, we strongly suggest that you refer to the size chart and carefully measure the circumference of your finger. This will ensure you get the most comfortable wearing experience and easily avoid any unnecessary returns or exchanges.
- 【Real‑time Accurate Sleep & Fitness Monitoring】 BIEMHA smart ring tracks your sleep quality and daily activities in real time. With advanced sensors, it provides precise data about your sleep cycle, helping you optimize rest and recovery. Whether you are tracking steps, calories or exercise performance, this smart ring can provide you with the most accurate insights to support your fitness goals and enhance your overall health.It is a good choice for family and friends.
- 【Health Monitoring】The BIEMHA ring features advanced 4.0 sensors that automatically measure your heart rate every 30 min when worn. It provides continuous health tracking and comprehensive wellness management all day.
- 【2‑3 Day Battery Life】 With a 2‑3 day battery life, the BIEMHA smart ring ensures continuous health monitoring without frequent charging. When used with the smart charging case, the usage time can even exceed 5 days. Whether you are tracking sleep patterns or fitness activities, you can count on long‑lasting performance without constant interruptions.
- 【80‑meter Waterproof, Suitable for Various Scenarios】 The BIEMHA Smart Ring has excellent waterproof performance, with a waterproof depth of up to 80 meters. Whether it's for daily wear, an intense workout session or a pleasant swimming time, it can handle it with ease. What's more, even if you have sensitive skin, you can still enjoy an extremely comfortable wearing experience when wearing this ring.
Do not buy Ring 4 as a medical diagnostic device. Its readings are wellness information and should not replace professional diagnosis, treatment, or advice.
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Oura Ring 4 remains a capable screenless sleep-and-wellness tracker for buyers who value passive tracking, the Oura app, and a broad size range. It is no longer Oura’s newest generation, and its value depends on verified local pricing and the recurring membership cost.
Buy Ring 4 when its discount is meaningful or its sizes suit you better; consider Ring 5 when its smaller form factor is worth the difference. Neither the product specifications nor the research here support calling Ring 4 the current category-wide gold standard or claiming a universal accuracy winner.
FAQ
Is Oura Ring 4 still worth buying in 2026?
Yes, if its verified price is meaningfully lower than Ring 5 or you need a size Ring 5 does not offer. Include membership in your cost comparison.
Is Oura Ring 4 newer than Ring 5?
No. Oura announced Ring 5 on May 28, 2026 and identifies it as its newest generation.
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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Does Oura Ring 4 require a membership?
Oura says membership is required for the full app experience; use without membership is limited. Check current local pricing and terms.
How long does Oura Ring 4 battery last?
Oura says new units typically last five to eight days under stated test conditions. Sensing settings, activity, use, and battery age can affect runtime.
Can Oura Ring 4 diagnose a health condition?
No. Oura says the ring is not a medical device and is not intended to diagnose, treat, cure, or prevent disease.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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