/>
Introduction: Why You Should Give Up Your Watch and Wear a Ring
People tired of the “annoyance of notifications” and “hassle of charging” of smartwatches are flocking to smart rings in 2026.
Rings don’t send notifications. They just quietly watch over your health. Their subtle yet certain presence has become the answer to modern people’s “digital fatigue”.
As of January 2026, the market is divided between the pioneer Oura Ring Generation 4 and the Galaxy Ring 2 from the giant Samsung. Both models have reached their second generation (Oura is effectively its fourth), entering a phase of technical maturity.
In this article, based on more than three months of hands-on experience and the latest data, we provide a complete guide to finding the best one for you.
Why Smart Rings Now?
The Limits of Smartwatches
Smartwatches like Apple Watch and Galaxy Watch are certainly multifunctional. However, that multifunctionality is becoming a noise in this era:
- Excessive Notifications : Your wrist vibrates during meetings and meals
- Battery Issues : Cannot be used the next day without daily charging
- Wearing Feel : The paradox where the discomfort while sleeping lowers the quality of sleep
- Fashionability : They stand out in a formal setting
The Superiority of Smart Rings
In contrast, smart rings create new value by specializing in recording:
- 7 to 10 Days of Battery Life : Charging only once a week is enough
- Zero Wearing Feel While Sleeping : Ensuring the acquisition of the most important sleep data
- Coexistence with Fashion : Fits both suits and casual wear
- Notification-less : Achieving both digital detox and health management
- Want to seriously improve sleep quality
- Tired of smartwatch notifications
- Want to settle for charging once a week
- Want a wearable that’s not out of place in formal settings
- Prioritize daily health management over activity
Thorough Comparison: Oura Ring 4 vs Galaxy Ring 2
Oura Ring 4 (Silver)
Basic Spec Comparison
| Item Oura Ring 4 | Galaxy Ring 2 | |
|---|---|---|
| Release Date, October 2025, December 2025 | ||
| Weight, 4-6g (Size dependent), 2.3-3.0g | ||
| Thickness, 2.55mm, 2.6mm | ||
| Material, Titanium (PVD coating), Titanium + Ceramic | ||
| Water Resistance, 10ATM (100m), 10ATM + IP68 | ||
| Colors | 6 colors (Black, Silver, Gold, etc.) | 3 colors (Black, Silver, Gold) |
| Size Variations, Sizes 6-13 (8 sizes), Sizes 5-13 (9 sizes) | ||
| Battery Life, Up to 8 days, Up to 10 days | ||
| Charging Time, Approx. 60-80 min, Approx. 90 min | ||
| Price (Approx.), From ~$350, Approx. $450 |
Sensor & Measurement Accuracy
| Measurement Item Oura Ring 4 | Galaxy Ring 2 | |
|---|---|---|
| Heart Rate | 24h continuous, ±2bpm accuracy | 24h continuous, standard accuracy |
| SpO2 (Blood Oxygen) | Automatic night measurement | Continuous measurement (Option) |
| Body Temperature, Baseline comparison (±0.1°C), Baseline comparison | ||
| Sleep Stages | 4 stages (Awake, Light, Deep, REM) | 4 stages (Same) + Snore detection |
| Activity | Automatic recognition for 40+ types | 100+ types (When linked with Galaxy Watch) |
| Steps, High precision (Better than watches), Standard accuracy | ||
| HRV (Heart Rate Variability) | Night + Day measurement | Night measurement only |
| Stress Index | Resilience Score | Energy Score + Samsung Health integration |
/g
The heart rate measurement accuracy of the Oura Ring 4 has improved to a level comparable to medical devices. This is because the blood flow in the fingertip is richer than in the wrist, making it easier for optical sensors to read. Galaxy Ring 2 is also highly accurate, but it falls one step behind Oura’s algorithm optimization based on huge accumulated data.
Software & Ecosystem
| Function Oura Ring 4 | Galaxy Ring 2 | |
|---|---|---|
| Compatible OS | iOS / Android (Fully supported) | Android (Optimized), iOS (Limited) |
| Dedicated App, Oura App (Standalone), Samsung Health required | ||
| Subscription Fee | $5.99/month (First month free) | Free (Included in hardware price) |
| Data Export | CSV / Integration with various health apps | Via Samsung Health only |
| AI Function | Oura Labs (Beta functions) | Galaxy AI integration (Auto analysis) |
| Third-party Integration | Strava, Apple Health, Google Fit, etc. | Samsung Health centric |
| Web Dashboard, Available (Full function), None (App only) |
/g
Oura Ring 4 requires a subscription of $5.99/month (approx. 900 yen). An annual running cost of approx. 10,800 yen is incurred, so using it for 3 years results in an additional cost of approx. 32,400 yen. Consider this along with the hardware price. Galaxy Ring 2 has a slightly higher hardware price but does not require a subscription.
Hands-on Review: What We Learned After 3 Months
Oura Ring 4: The Ultimate Tool for Data Geeks
Overwhelming Sleep Analysis
The true value of Oura Ring 4 lies in its Sleep Score . It’s not just sleep duration:
- Sleep Efficiency : The proportion of time actually asleep while in bed
- REM Sleep Ratio : The amount of REM sleep important for memory consolidation
- Deep Sleep Duration : The amount of deep sleep necessary for body recovery
- Toss and Turn Count : An index showing the quality of sleep
- Body Temperature Change : Prediction of poor health or menstrual cycle
From these data, a “Readiness Score” is calculated, predicting your performance for the day.
As a results of chasing Oura data for 3 months, I discovered a personal pattern: “Caffeine intake 2 hours before bed reduces deep sleep by 30%”. Being able to visualize your body’s reactions numerically like this is Oura’s greatest strength.
The Accuracy of Readiness Score
When you wake up in the morning, you have a feeling of “I’m in good/bad shape”, and Oura numerizes this. If the Readiness Score is 85 or higher, it’s a day to go all out. 65 or lower, it’s a day better not to push yourself.
By continuing a lifestyle according to this index, you can avoid overwork and maintain long-term performance.
Menstrual Cycle Prediction (For Women)
Oura predicts menstrual cycles from body temperature changes. The prediction accuracy for ovulation and start of menstruation is about 90%, comparable to dedicated apps. It will be especially valuable for those trying to conceive.
If you are an iPhone user, all Oura data is automatically synced to Apple Health. Since data integration with other health apps is seamless, health management across the entire ecosystem is possible.
Galaxy Ring 2: The Core of the Android Ecosystem
Unification with Samsung Health
The strength of Galaxy Ring 2 lies in its incorporation into the massive ecosystem of Samsung Health :
- Galaxy Watch Link : Accuracy of activity recognition improves when wearing both Ring 2 and Galaxy Watch
- Galaxy AI Analysis : The smartphone’s AI automatically analyzes health data and provides personalized advice
- Smart Home Integration : Link with SmartThings to automatically adjust lighting and temperature when sleeping
The Practicality of Snore Detection
A function unique to Galaxy Ring 2 is snore detection . By placing a Galaxy smartphone at the bedside, it records snores via the microphone and evaluates the risk of sleep apnea syndrome.
Actually using it, it clearly showed patterns of increased snoring on days when I “drank heavily” or “had a stuffy nose”.
The Intuitiveness of Energy Score
The “Energy Score”, equivalent to Oura’s “Readiness Score”, is simpler and more intuitive. For those who are not good with complex data, Galaxy Ring 2 will be easier to use.
- Using Galaxy S26 series
- Want to use in combination with Galaxy Watch
- Don’t want to pay subscription fees
- Automating home with Samsung SmartThings
- Prefer simple indicators over complex analysis
Selection Guide: Which One is Best for You?
Recommendation by Use Case
Case 1: Sleep Improvement is Top Priority
Recommendation: Oura Ring 4
Reasons:
- The depth and accuracy of sleep analysis is top-class
- The guidance for the next day by Readiness Score is accurate
- Detecting minute changes in physical condition from body temperature changes
Case 2: Want to Complete within the Android Ecosystem
Recommendation: Galaxy Ring 2
Reasons:
- Data management is completed within Samsung Health
- Smooth coordination with Galaxy Watch and Galaxy smartphones
- Simple cost management with no subscription required
Case 3: Athletes & Fitness Enthusiasts
Recommendation: Oura Ring 4 (Narrow margin)
Reasons:
- Excellent recovery evaluation by HRV measurement
- Abundant integration with third-party apps (Strava, TrainingPeaks, etc.)
- However, heart rate measurement during intense exercise is inferior to smartwatches
Case 4: Cost Importance
Recommendation: Galaxy Ring 2
Reasons:
- Zero additional cost with no subscription
- Hardware price is high, but the total is cheaper than Oura if used for 3 years
- There are few complaints in practical use in terms of functions
When used for 3 years:
- Oura Ring 4: $350 + $72 x 3 years = $566
- Galaxy Ring 2: $450
When used for 5 years:
- Oura Ring 4: $350 + $72 x 5 years = $710
- Galaxy Ring 2: $450
In the long term, the cost merit of Galaxy Ring 2 is large.
The Importance of Sizing: To Avoid Failure
The most important thing for a smart ring is size selection . If it’s too tight, it inhibits blood flow and lowers measurement accuracy. If it’s too loose, there”s a risk of it falling off.
Sizing of Oura Ring 4
Oura provides a free sizing kit :
- Apply from the official site (also applicable in Japan)
- Plastic size samples arrive
- Wear for at least 24 hours to confirm the best size
- Purchase the actual product
Since the degree of swelling changes between morning and night, confirm the size by wearing it for 24 hours straight. The size that feels “a bit tight?” is actually the size with the highest measurement accuracy. People tend to choose loose, but prioritize a just fit.
Sizing of Galaxy Ring 2
Galaxy Ring 2 also has a sizing kit, but fitting at Samsung Store retail locations is mainly recommended:
- Experience-based store like Apple Store with staff handling
- Can confirm size and purchase on the spot
- Can also apply for a sizing kit for online purchase
Battery Management and Charging Strategy
Measured Battery Duration
Public values and measured values differ. My usage data for 3 months:
Oura Ring 4:
- Public: Max 8 days
- Measured: Average 6-7 days
- Condition: SpO2 continuous measurement OFF, normal use
Galaxy Ring 2:
- Public: Max 10 days
- Measured: Average 8-9 days
- Condition: Standard settings, Galaxy Watch not linked
Charging Routine
My recommended charging timing:
Charge on Weekend Mornings
- Charge during the hour you take a shower on Saturday or Sunday morning
- Just this will make it last for a week
- Free yourself from the habit of “daily charging”
The dedicated charger is small, so be careful not to lose it. I keep mine at a fixed place in the washroom and always include it in my checklist for travel. Losing the charger is expensive (approx. $30-50 for a genuine one).
Data Privacy and Security
Health data is extremely sensitive personal information. Comparing the approaches of the two companies:
Oura’s Privacy Policy
- Data is encrypted and saved in the cloud
- Sale to third parties is explicitly prohibited
- Fully compliant with GDPR (EU General Data Protection Regulation)
- Users can export or delete data at any time
Samsung’s Privacy Policy
- Data management within Samsung Health
- Protection by Knox (security platform)
- Data is encrypted and distributed across servers in Korea and the EU
- Can opt out of use for Samsung advertisements
Both companies have sufficient privacy protection, but Oura has an advantage if you emphasize data independence . Samsung is part of a massive ecosystem, so the flow of data is complex. However, there are no practical issues.
Frequently Asked Questions (FAQ)
Q1: Is a smart ring enough? Is a smartwatch unnecessary?
A: It depends on the usage. A smart ring is a ‘recording device’, and a smartwatch is an ‘information device’. If notifications, payments, navigation, etc., are necessary, you should also use a smartwatch together. In fact, the combination of Oura + Apple Watch is popular.
Q2: What happens if battery depletion causes a day of missing data?
A: It’s no problem for just a day. Both devices emphasize long-term trend analysis, so a few days of data loss are statistically supplemented. However, the charging routine should be fixed for the sake of habituation.
Q3: Can people with metal allergies use it?
A: Both models are made of titanium, and the allergy risk is low. However, some people rarely have an allergic reaction even to PVD coating (Oura) or ceramic materials (Galaxy). Test for 24 hours with a sizing kit to confirm the reaction of the skin.
Q4: Can it be used in swimming or sauna?
A: Both models are 10ATM waterproof, so swimming is fine. Saunas are officially not recommended due to the risk of battery deterioration from high temperature, but many reports say short periods are not a problem. I use it in saunas myself and have had no trouble for 3 months.
Q5: Should I wear it on my right or left hand?
A: The non-dominant hand is recommended (left hand for right-handers). The reason is that the dominant hand has more movement, causing unnecessary activity data to be mixed in. However, those who have a habit of wearing rings should choose a finger that does not interfere.
2026 Market Trends: Who is the Third Player?
Currently, Oura and Samsung are the top two, but new entries are predicted moving toward the latter half of 2026:
- Apple Ring (Tentative name) : Rumors of actual productization from patent applications
- Amazfit Helio Ring : Challenger from China’s Zepp Health (already on sale overseas)
- Ultrahuman Ring Air : Lightweight model from an Indian startup
Especially if Apple’s entry becomes a reality, the market will move significantly. However, a release within 2026 is uncertain.
There is also the option of “waiting for Apple”, but release is predicted to be 2027 or later at the earliest. Since both Oura Ring 4 and Galaxy Ring 2 are sufficiently mature at the moment, buying now if needed now is the correct answer. The accumulation of one year’s worth of data is more valuable than the merit obtained by waiting one year.
ProsCons Review: Strengths and Weaknesses
- + [Common] Discomfort during sleep is overwhelmingly less than with a watch
- + [Common] Battery lasting more than a week eliminates forgetting to charge
- + [Common] High fashionability, not hindering suits or casual clothing
- + [Oura] Depth and accuracy of sleep analysis is close to medical grade
- + [Oura] Platform-neutral, optimal experience on both iPhone/Android
- + [Galaxy] No subscription required, long-term costs are low
- + [Galaxy] Excellent automatic analysis and advice by Galaxy AI
- + [Galaxy] Practical unique functions such as snore detection
- - [Common] Sizing requires effort and time
- - [Common] Since there is no screen, data cannot be checked without opening the smartphone
- - [Common] Caution for risk of deformation or scratches when holding heavy luggage
- - [Oura] Monthly subscription fee (~$6) continues to occur
- - [Oura] Purchase in Japan takes time for arrival due to overseas shipping
- - [Galaxy] Limits in coordination with iPhone, not optimal experience on iOS alone
- - [Galaxy] High dependence on Samsung Health ecosystem, low data portability
/g
Conclusion: Health Management in the AI Era is Handled by the “Ring”
Final Recommendation:
- iPhone User → Oura Ring 4 (No-brainer)
- Samsung Galaxy User → Galaxy Ring 2 (Utilize the power of the ecosystem)
- Android (Non-Samsung) User → Oura Ring 4 (Utilize platform neutrality)
- Cost Focus → Galaxy Ring 2 (Differences in subscription costs are large)
- Sleep Improvement Top Priority → Oura Ring 4 (Analysis depth is on a different level)
At any rate, as a health management device for 2026, the smart ring is becoming a new standard . You, tired of smartwatches, why not entrust yourself once to a ring that quietly watches over you?
Reference Links
Oura Ring Official Site
Galaxy Ring (Official Site)
Health management apps to use along with smart rings and gadgets for sleep improvement are planned to be detailed in another article.
⚠️ コメントのルール
※違反コメントはAIおよび管理者により予告なく削除されます
まだコメントがありません。最初のコメントを投稿しましょう！