The smart ring market in 2026 is a genuine four-way competition: a category inventor, a metabolic health startup, a trillion-dollar electronics giant, and a Chinese manufacturer undercutting everyone on price. Each ring makes a different bet about what health data is worth.
We wore all four simultaneously -- two per hand, rotated weekly -- for 90 days. We tracked sleep, HRV, activity, and temperature against clinical-grade references. This guide is the result.
Snel oordeel
Oura Ring 4
Most accurate sensors, best-validated sleep algorithm, deepest personalization. The subscription is the only real drawback.
4
Major smart rings
Oura, Ultrahuman, Samsung, RingConn
$149–$399
Price range
RingConn Gen 2 to Samsung Galaxy Ring
78%
Best sleep accuracy
Oura Ring 4 vs. clinical PSG
$0–$72/yr
Subscription costs
Only Oura charges ($72/yr)
Hardware at a Glance
| Feature | Oura Ring 4 | Ultrahuman AIR | Galaxy Ring | RingConn Gen 2 |
|---|---|---|---|---|
| Price | $349 + $5.99/mo | $349 | $399 | $149 |
| Weight | 4–6g | 3–5g | 2.3–3.0g | 3–4g |
| LED Sensors | 3 (G+R+IR) | 2 (G+IR) | 2 (G+IR) | 3 (G+R+IR) |
| SpO2 | Yes | No | No | Yes |
| Water Rating | 10 ATM | 10 ATM | 10 ATM | 5 ATM |
| Battery | 7 days | 6 days | 5–6 days | 7–8 days |
| Portable Case | No | No | Yes | No |
Sizing Is Not Optional
All four companies ship free sizing kits. Wear the test ring for at least 48 hours -- including overnight. Your fingers swell up to a full size between morning and evening. When uncertain, size up. A slightly loose ring still tracks accurately; a too-tight ring disrupts blood flow and sleep.
Sensornauwkeurigheid: The Real Differentiator
Three-wavelength systems (Oura, RingConn) enable SpO2 and multi-channel signal fusion. Two-wavelength systems (Ultrahuman, Samsung) are competent for HR and HRV but cannot measure blood oxygen.
| Metric | Oura | Ultrahuman | Samsung | RingConn |
|---|---|---|---|---|
| Resting HR | +-0.8 bpm | +-1.2 bpm | +-1.5 bpm | +-1.4 bpm |
| HRV (rMSSD) | +-3.2 ms | +-5.1 ms | +-6.8 ms | +-5.8 ms |
| Skin Temp | +-0.05C | +-0.1C | +-0.1C | +-0.1C |
| Sleep Staging | ~78% | ~72% | ~70% | ~68% |
| SpO2 | +-1.5% | N/A | N/A | +-2.2% |
Hardware Does Not Equal Software
RingConn uses the same three-wavelength LED config as Oura yet trails by 10 points in sleep accuracy. The difference is algorithm maturity -- Oura's models are trained on 500M+ nights across four hardware generations. Sensor quality sets the ceiling; software determines how close you get.
Slaaptracking: The Core Battleground
Oura (78%) is the benchmark. Chronotype detection, optimal bedtime, and a Readiness Score that integrates sleep, HRV, temperature, and multi-day activity load. Nothing else matches the depth.
Ultrahuman (72%) is the strongest challenger. Pair it with an M1 CGM and you can see how dinner affected glucose overnight and how that correlated with fragmented sleep. No other ring does this.
Samsung (70%) benefits from ecosystem maturity but suffers from first-gen ring algorithms. Deep sleep overcounts by 15--22 min. Snore detection (via phone mic) is clever but not a ring capability.
RingConn (68%) is surprisingly usable for $149. Sleep scores are directionally correct. SpO2 overnight is a real differentiator at this price. But the accuracy ceiling is noticeably lower.
sleep-tracking-guide
Unify all your wearable data and get personalized AI health insights in one place.
HRV and Recovery
| Feature | Oura | Ultrahuman | Samsung | RingConn |
|---|---|---|---|---|
| HRV Accuracy | +-3.2 ms | +-5.1 ms | +-6.8 ms | +-5.8 ms |
| Baseline Window | 30-day | 14-day | 14-day | 7-day |
| Recovery Score | Readiness (0-100) | Recovery (0-100) | Energy (0-100) | Vitality (0-100) |
| Daytime HRV | Spot checks | No | No | No |
| Deviation Alerts | Yes | Yes | Yes | Basic |
Never Compare HRV Between Devices
Oura might show 52 ms, RingConn 44 ms, Samsung 48 ms -- all simultaneously "correct." Different measurement windows, filtering, and artifact rejection. Only compare your trend within a single device over weeks and months.
Totale eigendomskosten
| Ring | Hardware | Subscription | Total |
|---|---|---|---|
| RingConn Gen 2 | $149 | $0 | $149 |
| Ultrahuman AIR | $349 | $0 | $349 |
| Samsung Galaxy Ring | $399 | $0 | $399 |
| Oura Ring 4 | $349 | $144 | $493 |
Over two years, Oura costs $144 more than Ultrahuman for similar hardware. Over five years, that gap grows to $360. But for many users, Oura's superior algorithms and deeper personalization clear that bar.
RingConn's value proposition is nearly impossible to beat for first-timers. Going from zero sleep data to 68%-accurate tracking is a transformative improvement.
Categoriewinnaars
Beste totaal
Oura Ring 4 Winner
Most accurate sleep staging (78%), best HRV measurement, deepest personalization, and the most mature algorithm. The subscription is the only significant drawback.
Runner-up: Ultrahuman Ring AIR
Beste waarde
RingConn Gen 2 Winner
Three-wavelength sensors, SpO2, 7-8 day battery, no subscription, $149. The best entry point into smart ring health tracking.
Runner-up: Ultrahuman Ring AIR
Best for Metabolic Health
Ultrahuman Ring AIR Winner
The only ring that integrates with a CGM. See how dinner affects sleep, and how sleep affects next-day glucose response.
Runner-up: Oura Ring 4
Best for Samsung Users
Samsung Galaxy Ring Winner
Seamless ecosystem integration, portable charging case, lightest ring ever made. The ring completes the Galaxy health network.
Runner-up: Oura Ring 4
Beoordelingen
✓Pros
- 78% sleep accuracy -- most validated in consumer wearables
- Best HRV measurement (+-3.2 ms)
- Temperature illness detection 1-2 days early
- 7-day battery, 30-day personalized baseline
✗Cons
- Mandatory $5.99/mo subscription
- Most expensive total cost
- No CGM integration
- No portable charging
✓Pros
- No subscription -- $349 total forever
- Unique CGM integration
- 6-axis IMU for best workout detection
- Thinnest, most comfortable design
✗Cons
- No SpO2 (two-wavelength only)
- HRV accuracy gap vs Oura
- Shorter battery (6 days)
- Sleep scoring overweights duration
✓Pros
- Lightest ring ever (2.3-3.0g)
- Portable charging case
- No subscription
- Deep Samsung Health ecosystem
✗Cons
- First-gen algorithm -- 70% sleep accuracy
- No SpO2
- HRV noise 2x higher than Oura
- Most expensive hardware ($399)
✓Pros
- $149 with no subscription
- Three-wavelength sensors with SpO2
- Longest battery (7-8 days)
- Great entry point for newcomers
✗Cons
- Lowest sleep accuracy (68%)
- 7-day HRV baseline too reactive
- Least mature app
- 5 ATM water resistance only
Frequently Asked Questions
If you check health data daily and adjust behavior based on HRV trends and Readiness Scores, yes. Without the subscription you lose personalized insights, trend analysis, and optimal bedtime. If you check once a week or less, the sub is hard to justify.
It competes -- it does not match. RingConn delivers ~85% of the features at 30% of the 2-year cost. For first-time smart ring users, going from zero to 68% accurate sleep data is transformative. Upgrade to Oura later if you want more precision.
All four fully support Android. Samsung Galaxy Ring has the tightest integration for Galaxy phone owners. Oura and Ultrahuman offer excellent Android apps with full feature parity to iOS.
Not diagnostically. Oura and RingConn track SpO2 overnight and can flag desaturation patterns consistent with obstructive sleep apnea. Neither has FDA clearance. Treat SpO2 data as a screening signal and consult a sleep specialist if you see repeated patterns.
Typical use: RingConn every 7-8 days, Oura every 7 days, Ultrahuman every 6 days, Samsung every 5-6 days (extended with charging case). All charge from 20% to 100% in under 90 minutes.
