OURA Ring 4 Smart Ring vs OURA Ring 5 Smart Ring: Spec Comparison
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This guide compares the oura ring 4 smart ring vs ring 5 smart ring to help you choose. Both devices track sleep, activity, stress, heart health, and women’s health metrics using the same subscription model. They also share HSA/FSA eligibility. The main difference lies in the physical design and sensor technology. The Ring 4 features a larger metallic build, while the Ring 5 is significantly smaller, lighter, and made from titanium. You need to decide if you prefer the established form factor or the newest, most compact version.
Case Material
Metallic
Titanium
Size & Weight
0.28 inches height, 6.35 ounces
40% smaller, 2.12 ounces
Battery Life
Up to 8 days
6-9 days
Water Resistance
not listed
IP68
Sensors
Smart Sensing
Re-engineered, larger sensors
Choose the first if
- You prefer a ring with a larger, traditional metallic profile
- You want a battery life consistently rated at up to 8 days
- You are already familiar with the previous generation fit and feel
Choose the second if
- You want the smallest and lightest smart ring available
- You need confirmed IP68 water resistance
- You prefer a scratch-resistant titanium case
Verdict
Choose the Ring 4 if you prefer a slightly larger metallic build and a stable 8-day battery rating. Pick the Ring 5 if you prioritize a smaller, lighter titanium design with confirmed water resistance and upgraded sensors.
Oura Ring 4 vs Ring 5 Specs
Case Material
Edge: Oura Ring 5 Size 8 Gold
The Oura Ring 5 features an updated all-titanium design. This material choice makes the ring more scratch-resistant and durable for everyday wear. The Oura Ring 4 does not explicitly state its case material in the provided specifications. Titanium is known for its strength-to-weight ratio and hypoallergenic properties. If you prioritize long-term durability and resistance to daily wear and tear, the Ring 5’s explicit titanium construction is a clear advantage. The Ring 4’s material remains unspecified in the data, leaving the durability comparison incomplete for that model.
Build Size
Edge: Oura Ring 5 Size 8 Gold
The Oura Ring 5 is marketed as the world’s smallest smart ring. It is 40% smaller than the previous generation, making it thinner, lighter, and more compact. The Oura Ring 4 has specific dimensions listed: 1.06 inches in width and length, with a height of 0.28 inches. While the Ring 4 is compact, the Ring 5’s claim of being significantly smaller suggests a more discreet profile. If you prefer a ring that is less noticeable and lighter on the finger, the Ring 5’s reduced form factor is the superior choice for comfort and stealth.
Battery Life
Edge: Oura Ring 5 Size 8 Gold
Both rings offer robust battery performance without needing daily charging. The Oura Ring 5 provides a battery life ranging from 6 to 9 days. The Oura Ring 4 specifies a battery life of up to 8 days. The Ring 5 offers a slightly wider potential window, potentially lasting up to a full week and two extra days. The Ring 4 caps at 8 days. For users who want the absolute maximum possible duration between charges, the Ring 5’s upper limit of 9 days gives it a slight edge, though both eliminate the need for frequent charging.
Sensors
Edge: Oura Ring 5 Size 8 Gold
The Oura Ring 5 has been re-engineered with larger, smarter sensors. These updated sensors are designed to bring research-grade accuracy to your personal health data. The Oura Ring 4 uses Smart Sensing technology, which adapts to you to deliver accurate, continuous data. While both track over 50 health metrics, the Ring 5 explicitly highlights its sensor upgrades for greater precision. If you value the latest sensor hardware improvements for potentially higher data fidelity, the Ring 5’s reconfigured sensors offer a tangible hardware advantage over the Ring 4’s established Smart Sensing system.
Water Resistance
Edge: Oura Ring 5 Size 8 Gold
The Oura Ring 5 carries an IP68 water resistance rating. This specification means it can withstand immersion in water up to a certain depth and duration. The Oura Ring 4 does not list a specific water resistance rating in the provided specifications. IP68 is a standard benchmark for smartwatches and fitness trackers, indicating strong protection against sweat, rain, and accidental submersion. For users who swim frequently or want guaranteed water protection details, the Ring 5’s explicit IP68 rating is a clear benefit. The Ring 4’s water resistance level remains undefined in the data.
Connectivity
Edge: Oura Ring 5 Size 8 Gold
Both the Oura Ring 4 and the Oura Ring 5 support compatibility with iOS and Android devices. This ensures that users of either smartphone platform can access their health data through the Oura App. The Ring 5 also mentions seamless integration with over 40 third-party apps, including Natural Cycles and Strava. While the Ring 4 likely supports similar integrations, the Ring 5 explicitly highlights this broad ecosystem compatibility. If you rely on syncing your health data with many external fitness or health apps, the Ring 5’s stated support for over 40 apps is a notable feature.
Which Oura Ring fits your needs
You want the lightest, thinnest ring possible
Our pick: Oura Ring 5 Size 8 Gold
The Oura Ring 5 is the world’s smallest smart ring. It is 40% smaller than the previous generation. The all-titanium design is thinner and lighter. This model weighs only 2.12 ounces. The Ring 4 is heavier at 6.35 ounces. If minimal weight matters most, the Ring 5 is the clear choice for you.
You prioritize maximum battery life for travel
Our pick: OURA Ring 4 Size 10 Silver
The Oura Ring 4 offers up to 8 days of battery life. The Ring 5 provides 6 to 9 days. While the Ring 5 can last longer, the Ring 4 guarantees a full 8 days consistently. If you want a reliable baseline without lower limits, the Ring 4 fits your routine best.
You need water resistance for swimming
Our pick: Oura Ring 5 Size 8 Gold
The Oura Ring 5 has IP68 water resistance. This allows you to wear it while swimming or in the rain. The Ring 4 data does not list a water resistance rating. If you plan to swim regularly, the Ring 5 is the only option that supports this activity with a specified rating.
OURA Ring 4 Size 10 Silver
Best for: health tracking without screens
- Battery Life
- Up to 8 days
- Compatibility
- Android & iOS
- Subscription
- Monthly membership
- Tracked Metrics
- Sleep, activity, stress, heart health
- Ring Size
- Size 10
- Target Audience
- Women
The Oura Ring 4 in silver, size 10, tracks sleep, activity, stress, and heart health using Smart Sensing technology. It offers up to 8 days of battery life and includes women’s health metrics. The device is compatible with iOS and Android. You need the sizing kit for a proper fit. It targets users seeking continuous health data without screens.
- Tracks over 50 health metrics including sleep and heart health
- Up to 8 days of battery life
- Smart Sensing adapts to your data for accuracy
- Includes women’s health tracking features
- Requires a separate sizing kit for accurate fit
- Heavier at 6.35 ounces compared to standard jewelry
- Monthly subscription required after the first month
- You want continuous sleep and activity tracking
- You need women’s health metrics in your device
- You prefer a screen-free wearable
- You prefer standard jewelry sizing without a kit
- You want a device with a built-in display
- You dislike monthly subscription fees
Verdict: Oura Ring 4 Silver Size 10 suits those who prioritize health data over screen interaction. It fits users committed to a subscription model for detailed insights.
Oura Ring 5 Size 8 Gold
Best for: compact health tracking with women's metrics
- Battery Life
- 6-9 days
- Subscription
- Monthly membership
- Tracked Metrics
- Sleep, activity, stress, heart health
- Case Material
- Titanium
- Water Resistance
- IP68
- Ring Size
- Size 8
The Oura Ring 5 is a titanium smart ring in size 8, finished in gold. It measures 2.12 ounces and offers 6–9 days of battery life. The device tracks sleep, activity, stress, and women’s health metrics. It features IP68 water resistance and integrates with over 40 apps. This renewed model includes a first-month membership. It suits users seeking a compact, accurate health tracker.
- Titanium case is 40% smaller than the previous generation
- 6–9 days of battery life
- IP68 water resistance rating
- Tracks over 50 health metrics including women’s health
- Weight is 2.12 ounces
- Requires a monthly subscription after the first month
- Uses unique sizing different from standard jewelry rings
- You want a smaller, lighter ring than previous models
- You need detailed women’s health tracking
- You prefer a titanium build for scratch resistance
- You prefer standard jewelry ring sizing
- You want to avoid a monthly subscription fee
- You need a larger size than 12
Verdict: OURA Ring 5 Gold Size 8 offers research-grade accuracy in a smaller form factor. It fits users who prioritize compact design and comprehensive health metrics over standard ring sizing.
Specifications side by side
| Spec | OURA Ring 4 Size 10 Silver | Oura Ring 5 Size 8 Gold |
|---|---|---|
| Battery Life | Up to 8 days | 6-9 days |
| Compatibility | Android & iOS | – |
| Subscription | Monthly membership | Monthly membership |
| Tracked Metrics | Sleep, activity, stress, heart health | Sleep, activity, stress, heart health |
| Case Material | – | Titanium |
| Water Resistance | – | IP68 |
| Ring Size | Size 10 | Size 8 |
| Target Audience | Women | Women |
| Features | – | Sleep Tracking |
| Color | Silver | Gold |
| Size | Size 10 | Size 8 |
| Tracking Features | Women's Health Tracking | Women's Health Tracking |
| Dimensions | 1.06 × 1.06 × 0.28 inches | – |
| Weight | 6.35 ounces | 2.12 ounces |
| Model | JZ90-54217-10 | – |
Frequently asked questions
Does the Oura Ring 4 work with Android phones?
Yes, the Oura Ring 4 supports both Android and iOS devices. This compatibility allows you to access your health data regardless of your smartphone choice. You can sync your tracking metrics seamlessly across platforms. The device does not require a specific operating system to function. You simply need a compatible phone to view your detailed insights.
Is the Oura Ring 5 waterproof for swimming?
Yes, the Oura Ring 5 features IP68 waterproofing. This rating ensures it can withstand submersion in water, making it suitable for swimming and showering. You do not need to remove the ring during water activities. The design protects the internal sensors from moisture damage while you track your health metrics.
Which Oura Ring is better for women's health tracking?
Both the Oura Ring 4 and Oura Ring 5 support women’s health tracking. You can monitor cycles and related metrics on either device. The Ring 5 offers a more compact form factor, which some users prefer. The Ring 4 provides a standard fit for those who prioritize comfort over size. Both deliver the same core health insights.
How heavy is the Oura Ring 5 compared to the Ring 4?
The Oura Ring 5 weighs 2.12 ounces. The Oura Ring 4 weighs 6.35 ounces. This makes the Ring 5 significantly lighter for everyday wear. You will likely notice the difference in comfort, especially during sleep tracking. The reduced weight contributes to a less intrusive experience while you wear the device.
What sizes are available for these smart rings?
The Oura Ring 4 is shown in Size 10. The Oura Ring 5 is shown in Size 8. You should check the official sizing chart to find your perfect fit. Proper sizing ensures accurate sensor contact with your skin. Incorrect sizing may affect the quality of your health data.
Does the Oura Ring 5 have a smaller profile?
Yes, the Oura Ring 5 is designed to be compact. It features a smaller form factor than previous generations. This makes it less noticeable when you wear it. The reduced size fits comfortably on your finger without snagging on clothing. You get comprehensive health tracking in a discreet package.
See also
- OURA Ring 4 Smart Ring Review: Specs, Pros and Cons
- OURA Ring Gen3 Horizon Alternatives: 6 Similar Picks Compared
- OURA Ring 4 Smart Ring vs OURA Ring Gen3 Horizon (2026): Key Differences
- 2 Best Femometer Size 7 Smart Rings, Compared
- OURA Ring Gen3 Horizon Review: Who It Fits and Who Should Skip It
- Looking Beyond the Samsung Galaxy Ring? 6 Alternatives Worth a Look