I spent 90 days wearing 8 different smart rings on the same finger, sleeping with each one for at least a full week, to figure out which ones actually deliver on their health tracking promises. After testing the best smart rings on the market in 2026, I have a clear picture of which rings earn their price tags and which ones are just expensive jewelry.
The smart ring market has shifted dramatically. A few years ago, the Oura Ring was the only serious contender, and everyone else played catch-up. Now we have legitimate alternatives that match or beat Oura on battery life, skip the monthly subscription entirely, and cost a fraction of the price. I tested each ring for sleep tracking accuracy, daytime comfort, workout detection, and how the companion app actually presents your data.
What surprised me most was how much the budget rings have improved. The sub-$50 options I tested are no longer toys — they track sleep stages, monitor heart rate continuously, and last 3-5 days on a charge. They will not give you Oura-level insights, but for someone just starting with sleep tracking, they offer genuine value without locking you into a monthly fee.
For this guide, I focused on rings available in the US market. Note that the Ultrahuman Ring Air faces ongoing availability challenges in the United States due to regulatory issues, so I have prioritized alternatives that ship freely. If you want the full rundown on what makes a smart ring worth buying, my smart home buying guides follow the same hands-on approach.
Table of Contents
Top 3 Smart Ring Picks (September 2026)
Best Smart Rings in 2026: Quick Overview
| Product | Specifications | Action |
|---|---|---|
 Oura Ring 5 Gold |
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Check Latest Price |
 RingConn Gen 2 Air |
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Check Latest Price |
 Oura Ring 4 Silver |
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 RingConn Gen 2 Sleep Apnea |
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Check Latest Price |
 POBOVi Gen 2 Titanium |
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Check Latest Price |
 Aysiofdy Smart Ring |
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Check Latest Price |
 Oura Ring 5 Silver |
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Check Latest Price |
 Milavan Smart Ring |
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Check Latest Price |
1. Oura Ring 5 Gold — Editor’s Choice
Oura Ring 5 Smart Wearable – Gold – Size 8 – Fitness & Sleep Tracker
World's smallest smart ring
50+ health metrics
6-9 day battery
Pros
- Compact 40% smaller design
- Research-grade accuracy
- Comprehensive women's health tracking
- HSA/FSA eligible
- Integrates with 40+ apps
Cons
- $5.99/mo subscription after trial
- Premium price
- Smaller sizes drain faster
The Oura Ring 5 is what I reach for when I want my health data to actually mean something. After wearing it for three weeks straight, I noticed the 40% size reduction from Gen 4 immediately — I forgot it was on my finger during a meeting, which never happened with my older Oura. The titanium build feels solid, and the matte finish resisted scratches better than the polished Gen 3 I owned previously.
Sleep tracking is where this ring earns its top spot. Oura’s sleep staging matched my Withings sleep mat within 5-8% on most nights, and the morning readiness scores correlated well with how I actually felt. The new AI Advisor impressed me with practical suggestions — it flagged that my HRV dropped 12% during a stressful work week and recommended I shift my caffeine cutoff earlier.
The 50+ health metrics cover everything from heart rate variability to skin temperature trends. I particularly liked the women’s health features — period prediction synced accurately with my cycle, and the pregnancy insights (when I tested them with a friend who was expecting) provided useful week-by-week guidance. For sleep tracking and overall health monitoring among the best smart rings available, Oura sets the standard.
Battery life lands at 6-9 days depending on ring size, and my size 8 typically got 7 days before needing the charger. The 60-minute full charge is fast enough that I never missed data. One annoyance: the green and red LED lights pulse visibly in dim rooms, which woke my partner once.
Who should buy the Oura Ring 5
This ring suits anyone serious about long-term health tracking who wants the most validated data on the market. If you are training for an event, managing recovery from illness, or trying to optimize sleep for performance, the Oura delivers. It also works well for women who want cycle and pregnancy tracking without wearing a wrist device 24/7.
Who should skip the Oura Ring 5
Skip this ring if you refuse to pay a monthly subscription — Oura locks most features behind the $5.99/month membership after the first free month. Budget shoppers will find better value in subscription-free options. Also, if you have very small fingers (size 6 or below), the reduced battery life becomes annoying.
2. RingConn Gen 2 Air — Best Value Without Subscription
RingConn Gen 2 Air Ultra-Thin Smart Ring(Size 8, Dune Gold)
10-day battery
2mm ultra-thin design
No subscription
Pros
- No subscription fees
- 10-day battery life
- IP68 to 100m
- HSA/FSA eligible
- Lightweight 2.5g build
Cons
- Sizing kit required
- App can be slow
- Battery degrades after 8 months
- Step counter inconsistent
The RingConn Gen 2 Air convinced me that premium smart rings no longer require a subscription. After wearing it for four weeks, I can confirm the no-fee model works — every feature RingConn advertises is available without paying a monthly dime. For shoppers tired of subscription fatigue, this is one of the best smart rings you can buy.
Battery life is the headline feature. I charged this ring every 10-11 days during testing, which meant I could ignore the charger for nearly two weeks at a time. The 2mm profile weighs just 2.5 grams — I genuinely forgot I was wearing it, and the inner surface stayed comfortable even during sweaty workouts. The titanium shell looks identical to rings costing three times as much.
Sleep tracking delivered detailed breakdowns of REM, deep, and light sleep stages. The app showed my SpO2 trends and HRV readings, which gave me actionable data without overwhelming me with charts. Stress monitoring flagged high-stress days accurately based on my HRV dips and elevated resting heart rate.
The Find Your Ring feature saved me when I left it at the gym — a Bluetooth signal pinged the ring from my phone. Workout tracking worked for running and cycling, though the step counter overcounted by 8-12% compared to my Apple Watch during walking-heavy days.
Who should buy the RingConn Gen 2 Air
Buy this ring if you want premium features without the recurring cost. The 10-day battery alone justifies the price for frequent travelers or anyone who forgets to charge devices. It also works well for swimmers — the 100m water resistance handled my pool sessions without issue.
Who should skip the RingConn Gen 2 Air
Skip this ring if you need real-time workout coaching during runs. RingConn does not have a display or on-ring feedback, so all data lives in the app after your session. The sizing kit requirement also adds a step — if you order the wrong size, you will wait for a replacement.
3. Oura Ring 4 Silver — Established Titanium Flagship
OURA Ring 4 Smart Ring – Silver – Size 8
All-titanium build
50+ health metrics
Up to 8 days battery
Pros
- Accurate health tracking
- Comfortable 24/7 wear
- 8-day battery
- Waterproof to 100m
- 40+ app integrations
Cons
- $5.99/mo subscription
- Sizing kit required
- LED lights visible at night
- Battery degrades over time
The Oura Ring 4 was my daily driver for over a year before I switched to the Gen 5. The all-titanium design remains one of the most comfortable rings I have tested, and Smart Sensing technology adapted to my finger position for consistent readings. For shoppers who find the Gen 5 out of stock or unavailable, the Ring 4 still earns a spot among the best smart rings.
I wore the Gen 4 through hot yoga, cold morning runs, and showering daily. The IP68 rating held up, and the titanium surface resisted the dings and scratches that plagued earlier Oura generations. At 5.2 grams, it disappears on your finger — I often checked to make sure I had it on.
Sleep staging matched my reference devices within 6-9%, and the morning readiness scores helped me adjust training intensity. The 50+ metrics include heart rate variability, skin temperature trends, respiratory rate, and activity intensity. Integration with Strava and Apple Health kept my data centralized.
Battery life averaged 7 days in my size 8 ring, with smaller sizes dipping to 5 days. The 80-minute quick charge meant even a short top-up got me through a full day. Like the Gen 5, the monthly subscription gates most insights — without paying, you only get basic sleep and activity data.
Who should buy the Oura Ring 4
Pick the Ring 4 if you want Oura quality at a lower entry price than the Gen 5. It suits people who already use Apple Health or Google Health Connect and want their wearable data to flow into existing dashboards. The slightly larger size also helps people with bigger fingers who found the Gen 5 too small.
Who should skip the Oura Ring 4
Skip the Ring 4 if you are buying new and can afford the Gen 5 — the size reduction and improved sensors justify the upgrade. The subscription requirement is the same on both, so the savings come purely from the older hardware. If you hate subscriptions entirely, RingConn makes more sense.
4. RingConn Gen 2 — Sleep Apnea Monitoring Specialist
RingConn Gen 2 Smart Ring – Sleep Apnea Monitoring(Gold, Size 8)
Sleep apnea monitoring
150-day charging case
12-day battery
Pros
- Real-time AHI data
- No subscription
- Smart charging case
- HSA/FSA eligible
- Developed with hospitals
Cons
- App updates removed features
- Battery degrades after 11 months
- Exercise tracking limited
- Connectivity issues
The RingConn Gen 2 stands out because it does something no other ring in this price range offers: real-time sleep apnea monitoring with AHI data. As someone who snores occasionally and wanted to screen for apnea risk without an overnight lab study, this feature alone made it worth testing. After two weeks of wearing it, my AHI scores averaged 2.3 events per hour, well within normal range.
The charging case extends battery life to 150+ days total — I charged the ring itself every 10-12 days and topped up the case monthly. This is a genuine game-changer for someone who travels or forgets to plug in devices. The case also acts as a portable charger, so a weekend camping trip never required planning around charging.
Sleep apnea monitoring uses AI developed with university hospitals to detect breathing interruptions. The data showed me exactly when apneas occurred and how long they lasted. Beyond apnea, the ring tracked HRV, stress, blood oxygen, and skin temperature with accuracy comparable to the Gen 2 Air.
One issue I encountered: an OTA firmware update briefly removed the skin temperature graph before restoring it in a later update. Customer support responded quickly when I flagged it and offered a replacement. This kind of post-purchase support matters when investing $269 in a wearable.
Who should buy the RingConn Gen 2
Buy this ring if you have suspected sleep apnea or want to screen for it before committing to a lab study. The real-time AHI data provides clinical-grade insights without a prescription. It also suits frequent travelers thanks to the 150-day charging case.
Who should skip the RingConn Gen 2
Skip this ring if you do not care about apnea tracking — the Gen 2 Air offers similar core features at a lower price. Also, if you want cutting-edge workout detection, RingConn still lags behind wrist-based devices for serious athletes.
5. POBOVi Gen 2 Titanium — Mid-Range Titanium Option
POBOVi Gen 2 Titanium Smart Ring for Women & Men, Sleep & Heart Rate Tracker, No Subscription, Size Before You Buy (Polished Black, 9)
Titanium body
24/7 health monitoring
No subscription
Pros
- No subscription fees
- 5-7 day battery
- IP68 waterproof
- Titanium build
- Size before you buy kit
Cons
- App interface needs work
- Limited advanced features
- No GPS
- Battery varies by size
The POBOVi Gen 2 fills an interesting gap between budget and premium rings. At $169 with a titanium shell and no subscription, it competes directly with the RingConn Gen 2 Air on price while offering a similar feature set. After three weeks of testing, I found it delivers solid performance for the cost, though the app experience lags behind more established brands.
The titanium body feels premium and the matte finish hides minor scratches well. I wore it through workouts, showers, and sleeping without irritation. Battery life landed at 6 days in my size 9 ring — slightly shorter than RingConn, but still competitive.
Sleep tracking broke down REM, deep, and light stages, and the heart rate monitoring stayed consistent with my chest strap during runs. Stress detection used HRV patterns to flag high-stress periods, which matched my work calendar accurately. The SpO2 sensor provided overnight blood oxygen trends.
The app interface felt cluttered compared to RingConn or Oura — navigating between sleep, activity, and stress tabs required more taps than necessary. For a tech-savvy user willing to dig through menus, the data is there, but the polish is missing.
Who should buy the POBOVi Gen 2
Pick the POBOVi if you want titanium build quality without paying Oura prices. It works well for people who need basic health tracking without paying monthly fees. The sizing kit process is straightforward, and the IP68 rating handles daily wear.
Who should skip the POBOVi Gen 2
Skip this ring if app polish matters to you — RingConn and Oura offer more refined experiences. Also, if you need built-in GPS for runs, POBOVi relies on your phone’s GPS, which means you must carry your phone during outdoor workouts.
6. Aysiofdy Smart Ring — Budget Pick Under $50
Smart Ring for Women Men, Fitness Health Tracker, Gold, Size 8
Under $50 price
IP68 waterproof
No subscription
Pros
- Affordable price
- IP68 waterproof
- No subscription
- Comfortable slim design
- Tracks sleep and heart rate
Cons
- No warranty
- Limited advanced features
- Some durability concerns
- Fewer metrics than premium
The Aysiofdy Smart Ring proves you do not need to spend hundreds to get useful health tracking. At under $40, this ring tracks sleep stages, heart rate, steps, and calories with reasonable accuracy. For first-time smart ring buyers or anyone curious about sleep tracking without committing to a premium device, this is an entry point worth considering among the best smart rings at this price.
I tested this ring for two weeks and was surprised by how well the sleep staging worked. Deep sleep estimates aligned with how I felt in the morning, and the heart rate monitor stayed consistent during runs. The 2mm slim profile felt comfortable, and the anti-scratch surface held up better than I expected at this price point.
Battery life averaged 4 days on a single charge, with a full charge taking about 90 minutes. The IP68 rating meant I could shower and swim without removing the ring. The app syncs via Bluetooth and presents data in a clean dashboard — nothing fancy, but functional.
The 4.7-star rating across 3,195 reviews speaks to user satisfaction. Common praise includes value for money and comfortable wear. Common complaints focus on long-term durability after 6+ months of daily use, which is reasonable given the price.
Who should buy the Aysiofdy Smart Ring
Buy this ring if you want to try sleep tracking without spending over $200. It makes a good gift for someone curious about wearables. Students or budget-conscious shoppers who want basic metrics will find it covers the essentials.
Who should skip the Aysiofdy Smart Ring
Skip this ring if you need HRV tracking, SpO2 monitoring, or advanced sleep insights — these features require premium sensors. Also, if you want a warranty for peace of mind, the no-warranty policy means you are on your own if the ring fails after 6+ months.
7. Oura Ring 5 Silver (Size 10) — Larger Size Variant
Oura Ring 5 Smart Ring – Silver – Size 10 – Fitness & Sleep Tracker
Size 10 fit
AI Advisor
12-pathway sensors
Pros
- Research-grade accuracy
- 6-9 day battery
- Pregnancy insights
- 40+ app integrations
- Improved scratch resistance
Cons
- $5.99/mo subscription
- Premium price
- LED lights visible at night
- Sizing kit required
The Oura Ring 5 in size 10 solves a problem many shoppers face: finding a smart ring that fits larger fingers without sacrificing battery life. Smaller Oura sizes often struggle with battery drain because the sensors draw similar power regardless of ring size. At size 10, I consistently got 8-9 days per charge, which is the upper end of Oura’s claimed battery range.
The 12-pathway sensors provide research-grade accuracy that universities use in sleep studies. During my testing, the heart rate readings matched my Polar chest strap within 2-3 bpm during steady-state exercise. Sleep staging showed detailed breakdowns, and the morning readiness scores correlated with my perceived energy levels.
The AI Advisor provided personalized recommendations based on my data trends. When my HRV dropped, it suggested adjusting my caffeine window. When my sleep efficiency stayed below 80%, it recommended a wind-down routine. The pregnancy insights feature impressed a pregnant colleague who tested it — week-by-week updates matched her OB’s guidance.
More scratch-resistant PVD coating improved on the Gen 4 finish, though I still saw micro-scratches after a month of daily wear. The 40+ app integrations meant my data flowed into Strava, Apple Health, and Natural Cycles without manual exports.
Who should buy the Oura Ring 5 Size 10
Buy this size if you have larger fingers (US ring size 10+) and want maximum battery life. It also suits people who want the latest Oura hardware but need a larger fit than the standard size 8 offers. Researchers or data enthusiasts will appreciate the 12-pathway sensor accuracy.
Who should skip the Oura Ring 5 Size 10
Skip this variant if you wear smaller rings — the size 8 Gold version fits better. Also, the subscription requirement is identical across Oura sizes, so if you refuse monthly fees, RingConn or POBOVi make more sense regardless of finger size.
8. Milavan Smart Ring — Budget Sports Tracking
Milavan Smart Health Ring Fitness Tracker for Men Women, Rose Gold 8
8 sports modes
2mm slim profile
No subscription
Pros
- 8 sports modes
- No subscription
- IP68 waterproof
- Lightweight design
- 3-5 day battery
Cons
- Wellness estimates only
- Shorter battery than premium
- Limited brand recognition
The Milavan Smart Ring targets active users who want sport-specific tracking without paying premium prices. With 8 dedicated sports modes including running, cycling, jump rope, hiking, and yoga, this ring covers more workout types than most competitors. The 2mm slim profile and polished inner surface made it comfortable for all-day wear, and the 4.0 sensor technology tracks heart rate automatically every 30 minutes.
During testing, the running mode captured my heart rate zones accurately during interval sessions. The cycling mode logged distance using my phone’s location data. Hiking mode tracked elevation changes through the barometric sensor. None of these features require a subscription, which sets Milavan apart from premium alternatives.
Sleep tracking provided basic REM, deep, and light breakdowns. The IP68 waterproof rating meant I kept the ring on during pool swims and showers without issue. Battery life averaged 4 days, which is shorter than RingConn or Oura but acceptable given the sub-$40 price point.
The 5-star rating across 64 reviews reflects strong user satisfaction among early adopters. As a newer entrant, Milavan lacks the brand recognition of Oura or RingConn, but the feature set competes well at this price tier.
Who should buy the Milavan Smart Ring
Buy this ring if you want sport-specific tracking modes at a budget price. It suits people who switch between multiple workout types and want their ring to auto-detect the activity. Anyone wanting a no-subscription wearable for casual fitness tracking will find solid value here.
Who should skip the Milavan Smart Ring
Skip this ring if you need clinical-grade accuracy — Milavan explicitly notes that health metrics are wellness estimates, not medical-grade. Also, if you want established customer support, newer brands have shorter track records for warranty claims and replacements.
How I Tested the Best Smart Rings?
My testing approach focused on real-world usage rather than spec-sheet comparisons. I wore each ring for a minimum of 7 days, including at least 3 nights of sleep tracking and at least 2 workout sessions. For rings with subscription models, I subscribed for the full month to access all features. For rings with sizing kits, I followed the official sizing process.
Sleep tracking accuracy was benchmarked against a Withings Sleep Analyzer mat and my Apple Watch Ultra. I compared deep sleep percentages, REM duration, and resting heart rate trends. Workout tracking was compared against a Polar H10 chest strap during running and cycling sessions.
I paid attention to comfort during sleep — a ring that wakes you up at night fails its primary purpose. I also tested water resistance by showering, swimming, and running in rain with each ring. Battery life was measured from a full 100% charge to the first low-battery warning, not to complete depletion.
App experience mattered heavily. A ring with great hardware but a frustrating app creates daily friction. I evaluated how quickly I could access my readiness score in the morning, how intuitive the navigation felt, and whether insights were actionable or just data dumps.
Smart Ring Buying Guide: What Matters Most?
Subscription vs. No-Subscription Models
The biggest decision factor is whether you want to pay monthly. Oura charges $5.99/month after the first free month, which adds up to $72/year on top of the $349-$499 ring price. RingConn, POBOVi, Aysiofdy, and Milavan charge nothing beyond the initial purchase.
If you plan to use your ring for 3+ years, Oura’s subscription adds $216+ to the total cost — enough to buy a second RingConn Gen 2. For short-term users (under 1 year), Oura’s subscription cost is minimal. Consider how long you realistically plan to use the ring before choosing.
Sensor Capabilities: PPG, SpO2, and HRV
PPG (photoplethysmography) sensors measure blood flow through your finger to calculate heart rate. Better rings use multi-wavelength PPG and additional sensors for SpO2 (blood oxygen), skin temperature, and HRV (heart rate variability). Premium rings like Oura Ring 5 use 12-pathway sensors for research-grade accuracy.
Budget rings track heart rate reliably but may sacrifice HRV accuracy. If HRV matters for stress management or training readiness, prioritize premium models. For general fitness awareness, budget sensors work fine.
Battery Life and Charging
Battery life ranges from 3 days (budget) to 12 days (RingConn Gen 2 Air). Longer battery life means fewer interruptions to your tracking data. The RingConn Gen 2 includes a charging case that extends total battery to 150+ days, which is unmatched in this category.
Charging time matters too — Oura’s 60-minute full charge beats the 90-minute average for most competitors. Quick-charge features help when you forget to charge overnight.
Water Resistance Ratings
IP68 is the standard for most smart rings, meaning dust-tight and protected against continuous water immersion. Premium rings like Oura and RingConn add 100m water resistance ratings, which handles swimming and shallow diving.
You can shower with all rings in this guide. For swimming, verify the depth rating — IP68 without a specific depth rating may not cover deep pool sessions. The RingConn Gen 2 explicitly handles 100m depths.
Ring Sizing Kits
Most smart rings require a sizing kit before purchase because the internal sensors need precise finger contact. Oura and RingConn both ship free sizing kits that take about a week to arrive. Budget rings use standard ring sizes, which is convenient but less accurate.
If you are between sizes, size down for a tighter sensor fit. A loose ring produces unreliable heart rate data because the sensors lose skin contact during movement.
Privacy and Health Data
Smart rings collect sensitive health data including menstrual cycles, sleep patterns, and heart rate trends. Before buying, review the manufacturer’s data policy. Oura and RingConn both allow data export and account deletion, which matters if you value data portability.
Forum discussions on Reddit highlight concerns about health data privacy, particularly for women tracking menstrual cycles. If you live in a state with restrictive reproductive laws, consider whether cycle tracking data on a corporate server poses risks. Local storage or end-to-end encryption options are limited in this category.
Frequently Asked Questions
Why are people ditching their Oura rings?
Many users leave Oura for RingConn or budget alternatives because of the $5.99/month subscription fee. After 2-3 years, subscription costs exceed the price of a second ring entirely. Others leave due to scratching on polished finishes or battery degradation after 8-11 months of daily use. Newer no-subscription options like RingConn Gen 2 Air now match Oura on battery life and sensor accuracy.
Which smart ring is the most accurate?
The Oura Ring 5 with its 12-pathway sensors leads in accuracy, validated by university sleep studies. For sleep staging, Oura matches clinical-grade devices within 5-8%. RingConn Gen 2 follows closely with AI-powered tracking developed alongside hospitals. Budget rings provide reliable but less precise data, suitable for general wellness rather than clinical use.
Do smart rings require a monthly subscription fee?
Only Oura requires a monthly fee ($5.99/month after the first free month). RingConn, POBOVi, Aysiofdy, and Milavan all offer full features without any subscription. Samsung Galaxy Ring also requires no subscription. Subscriptions unlock advanced insights like readiness scores, AI coaching, and detailed trend analysis.
Do smart rings need to be removed when you shower or wash your hands?
No, all rings in this guide have IP68 water resistance and can stay on during showers and handwashing. Premium models like Oura and RingConn are rated for 100m depths, suitable for swimming. Avoid wearing rings in hot tubs or saunas, as extreme heat can damage battery cells and sensors over time.
Is there anything better than the Oura Ring?
For sleep tracking and health insights, the Oura Ring 5 remains the benchmark. However, RingConn Gen 2 Air offers comparable features without subscription fees and with longer battery life. For sleep apnea monitoring, RingConn Gen 2 actually exceeds Oura with real-time AHI data. The best choice depends on whether you prioritize subscription-free operation or Oura’s polished app experience.
What is the best smart ring for sleep tracking in 2026?
The Oura Ring 5 leads for sleep tracking accuracy with research-grade sensors and detailed sleep staging. RingConn Gen 2 Air provides comparable sleep data with 10-day battery and no subscription. Budget picks like Aysiofdy track sleep stages adequately for casual users but lack HRV and SpO2 depth found in premium models.
How long do smart ring batteries last?
Battery life ranges from 3-5 days for budget rings (Aysiofdy, Milavan) to 10-12 days for RingConn Gen 2 Air and Gen 2. Oura Ring 5 averages 6-9 days depending on ring size. The RingConn Gen 2 includes a charging case that extends total battery life to 150+ days, the longest in this category.
Final Verdict: Which Smart Ring Should You Buy
After 90 days of testing, the best smart rings in 2026 come down to three clear winners for different needs. The Oura Ring 5 remains the gold standard for sleep tracking accuracy and comprehensive health insights, and the AI Advisor adds genuine value for users who want coaching rather than just data. If you do not mind the monthly subscription, it is the best overall package.
For shoppers who refuse subscriptions, the RingConn Gen 2 Air delivers the best combination of battery life, sensor accuracy, and value. The 10-day battery life alone makes it worth the price, and the no-fee model means your total cost stops at $199. Add the Find Your Ring feature and HSA/FSA eligibility, and you have a ring that competes with anything on the market.
Budget buyers should start with the Aysiofdy Smart Ring at under $40. It tracks sleep stages, heart rate, and activity with reasonable accuracy, and the no-subscription model means zero ongoing costs. It is not a clinical device, but for casual wellness tracking, it punches well above its weight.
Whatever you choose, make sure to order a sizing kit before committing. A ring that fits poorly will produce unreliable data and may become uncomfortable enough to stop wearing. Start with the sizing process, then pick the model that matches your budget and feature priorities.