Choosing a smart ring for fitness tracking means weighing how much detail you want against how much ongoing app access matters. The Oura Ring 4 is my leading pick for people who want broad health metrics and app integrations, while the Milavan Smart Health Ring is a more focused option with eight sports modes and no subscription. For swimming and a wider mix of wellness readings without a membership, the Mirlray R02C is the standout alternative.
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These five options split into two clear camps: Oura offers a deeper tracking ecosystem, but continued membership is required after the included month for new members; the other three rings advertise app access without subscription fees, with more limited or less detailed tracking in the supplied descriptions. Battery life, water resistance, fit, and how often heart rate is measured also affect which ring suits a particular routine. I rank them by how well their stated features serve fitness tracking, while accounting for those tradeoffs.
Key Takeaways
- Oura Ring 4 offers more than 50 health metrics, workout memory, and GPS geotagging, but ongoing membership is required after the included first month for new members.
- Milavan is the clearest choice here for guided activity variety: its eight listed sports modes span running, cycling, yoga, golf, and more, with no subscription required.
- Mirlray R02C pairs heart rate, blood oxygen, stress, sleep, and step tracking with 10ATM water resistance and up to five days of battery life.
- BIEMHA specifies heart rate checks every 30 minutes, so it suits general activity and sleep awareness better than buyers seeking continuous heart rate data.
- Oura Ring 5 is listed with the broadest metric count and longest battery range, but its subscription requirement and unclear place beside Ring 4 make checking the exact model especially important.
| Oura Ring 4 Smart Ring, Silver, Size 10 |  | Best Overall for a Connected Fitness and Wellness Picture | Material: All titanium | Color and listed size: Silver, size 10 | Health metrics: More than 50 | VIEW ON AMAZON | See Our Full Breakdown |
| Mirlray Smart Ring Health Tracker (R02C, Rose Gold, Size 8) |  | Best for Swimming and Wider Wellness Tracking Without a Subscription | Model: R02C | Color and listed size: Rose gold, size 8 | Water resistance: 10ATM | VIEW ON AMAZON | See Our Full Breakdown |
| Milavan Smart Health Ring Fitness Tracker, Rose Gold, Size 8 |  | Best for Beginners Who Want Named Sports Modes | Color and listed size: Rose gold, size 8 | Profile thickness: 2 mm | Sports modes: Running, cycling, jump rope, walking, hiking, yoga, dancing, and golf | VIEW ON AMAZON | See Our Full Breakdown |
| BIEMHA Smart Ring Health Tracker, Sleep & Fitness Monitoring, iOS/Android Compatible, Waterproof, No Subscription (Silver, Size 7) |  | Best for Basic Tracking and Flexible Charging | Brand, color, and listed size: BIEMHA, silver, size 7 | Compatibility: iOS and Android | Tracking: Sleep quality, daily activity, steps, calories, and heart rate | VIEW ON AMAZON | See Our Full Breakdown |
| Oura Ring 5 Smart Ring, Silver, Size 7 |  | Best Premium Feature Set, With a Model Check Required | Material and color: All titanium, silver | Listed size: Size 7 | Health metrics: More than 50 | VIEW ON AMAZON | See Our Full Breakdown |
| smart ring for fitness tracking oura ring 4 | Battery life | Color and listed size |
|---|---|---|
| Oura Ring 4 Smart Ring | 5 to 8 days | Silver, size 10 |
| Mirlray Smart Ring Health Trac | Up to 5 days | Rose gold, size 8 |
| Milavan Smart Health Ring Fitn | — | Rose gold, size 8 |
| BIEMHA Smart Ring Health Track | 2 to 3 days; 5+ days with charging case | — |
| Oura Ring 5 Smart Ring | 6 to 9 days | — |
More Details on Our Top Picks
Oura Ring 4 Smart Ring, Silver, Size 10
The Oura Ring 4 takes my top spot because its stated feature set reaches beyond basic steps and sleep: it tracks more than 50 health metrics, includes daily workout memory, and can add GPS geotagging to recorded activity. That breadth makes it a stronger fit than BIEMHA’s more interval-based heart rate tracking or Milavan’s clearly listed but narrower set of eight sports modes for someone who wants one ring to connect activity with wider health trends.
The tradeoff is ongoing access. New members get the first month included, but a membership subscription is required afterward. BIEMHA, Milavan, and Mirlray state that they do not require subscriptions, making them easier to choose for buyers who want basic tracking without a recurring app fee. Oura’s listed battery life is five to eight days, and it works with iOS and Android. Its screen-free form keeps information in the app, so it will not replace a watch display during a workout.
Fit deserves attention: this size 10 listing calls for accurate sizing with the Oura Ring 4 Sizing Kit. I would choose it for the combination of broad metrics and activity features, provided the membership model suits my preferences. If my priority were specific sports modes without a subscription, Milavan would be the simpler pick; if I wanted swimming details, Mirlray explicitly lists 10ATM water resistance.
Pros:- Tracks more than 50 health metrics, including sleep, activity, stress, and heart health.
- Includes daily workout memory and GPS geotagging features.
- Works with iOS and Android.
- Listed battery life is five to eight days.
Cons:- New members need a paid membership after the included first month.
- Accurate fit requires using the Oura Ring 4 Sizing Kit.
- The screen-free design means workout information is viewed on a phone.
Best for: Buyers who want broad health metrics, workout memory, GPS geotagging, and iOS or Android compatibility in one ring.
Not ideal for: People who do not want a recurring membership, need a screen during training, or want a stated list of sport modes.
- Material:All titanium
- Color and listed size:Silver, size 10
- Health metrics:More than 50
- Battery life:5 to 8 days
- Compatibility:iOS and Android
- Activity features:Activity tracking, cycle tracking, daily workout memory, GPS geotagging
- Membership:First month included for new members; subscription required afterward
Our verdict“I recommend the Oura Ring 4 for buyers who value a broad connected tracking package enough to accept its ongoing membership.”
Mirlray Smart Ring Health Tracker (R02C, Rose Gold, Size 8)
The Mirlray R02C earns its place through a particularly useful combination for varied routines: it lists heart rate, blood oxygen, stress, sleep, and step tracking, and specifies 10ATM water resistance for swimming and showering. Among the subscription-free choices here, that makes it more compelling for a buyer who wants more than sleep and steps and expects the ring to accompany water-based activity. BIEMHA also claims swim suitability, but its listing specifies 80-meter waterproofing and a heart rate check every 30 minutes; Mirlray gives a broader set of wellness measures.
Its battery lasts up to five days, close to Milavan’s three to five day range, though shorter than the Oura options’ stated upper ranges. Remote camera control by hand gesture adds a convenience feature, but it is secondary to fitness tracking. The ring has no display, so I would expect to check recorded information on a phone app. The listing also says setup requires following the connection guide, a small friction point for buyers who want a quick start.
Mirlray is the more versatile choice than BIEMHA on listed wellness categories and water resistance, but it does not name sport modes the way Milavan does. Its value is the combination of app access without a subscription and a wide mix of measurements, rather than a detailed training interface. I would choose it for swimming and general wellness awareness, while remembering that the supplied description does not specify heart rate measurement frequency or clinical accuracy.
Pros:- Tracks heart rate, blood oxygen, stress, sleep, and steps.
- 10ATM water resistance is listed for swimming and showering.
- Up to five days of battery life.
- Mobile app access has no subscription fee.
Cons:- No display; recorded data is viewed in the mobile app.
- Initial setup requires following the connection guide.
- The description does not specify heart rate sampling frequency.
Best for: People who want a subscription-free ring for swimming, sleep, and several wellness measures including blood oxygen and stress.
Not ideal for: Buyers who want a display, named sport modes, or precise information about heart rate sampling frequency.
- Model:R02C
- Color and listed size:Rose gold, size 8
- Water resistance:10ATM
- Battery life:Up to 5 days
- Tracking:Heart rate, blood oxygen, stress, sleep, and steps
- Additional feature:Remote camera control via hand gesture
- Subscription:None required
Our verdict“I would pick the Mirlray R02C for subscription-free wellness tracking that explicitly includes swimming-ready water resistance.”
Milavan Smart Health Ring Fitness Tracker, Rose Gold, Size 8
The Milavan Smart Health Ring is my pick for buyers who want activity tracking to map to recognizable workouts. Its eight listed modes cover running, cycling, jump rope, walking, hiking, yoga, dancing, and golf, which gives it a clearer exercise focus than BIEMHA’s description of general daily activity. It also tracks sleep stages, heart rate, and activity, with no subscription required. For someone starting with a ring, those specifics make it easier to see what the product is meant to support.
Battery life is listed at three to five days, and charging takes one to two hours. That is a practical middle ground: it offers more stated sports structure than Mirlray, but needs charging more often than the Oura rings’ longer listed ranges. The profile is 2 mm thick, a detail that may appeal to people who want a slim form factor, though fit still depends on checking finger size before purchase.
The compromise is that the supplied details do not list advanced training analytics, GPS, or water resistance. Mirlray is a better match for a swimming routine, and Oura Ring 4 is the more feature-rich option for broader connected health tracking. Milavan’s role is narrower and useful: affordable in complexity, not price, with no subscription and a specific menu of activities. Its listing says the data is for reference and not medical use, so I would treat the app as a personal tracking aid.
Pros:- Lists eight sports modes, including running, cycling, yoga, and golf.
- Tracks heart rate, sleep stages, and activity.
- No subscription is required.
- Battery life is listed at three to five days, with one to two hour charging.
Cons:- The supplied description does not state water resistance.
- Heart rate is measured automatically every 30 minutes while worn.
- The listing says health data is for reference, not medical use.
Best for: New smart-ring buyers who want a no-subscription tracker with named modes for common sports and activities.
Not ideal for: Swimmers, buyers seeking GPS or advanced metrics, or anyone who needs medical-grade monitoring.
- Color and listed size:Rose gold, size 8
- Profile thickness:2 mm
- Sports modes:Running, cycling, jump rope, walking, hiking, yoga, dancing, and golf
- Heart rate:Automatically every 30 minutes while worn
- Sleep tracking:Deep, light, REM, and awake periods
- Battery and charging:3 to 5 days; charges in 1 to 2 hours
- Compatibility and subscription:Android 5.0+ and iOS 9.0; no subscription required
Our verdict“I recommend Milavan to beginners who want named activity modes and straightforward app access without membership fees.”
BIEMHA Smart Ring Health Tracker, Sleep & Fitness Monitoring, iOS/Android Compatible, Waterproof, No Subscription (Silver, Size 7)
BIEMHA is the straightforward pick for buyers who want basic sleep and activity tracking without app subscription fees. It covers sleep quality, daily activity, steps, calories, and heart rate, with iOS and Android compatibility. Its notable limitation is specific: heart rate is measured every 30 minutes, so it is less suited to someone who wants frequent or continuous readings during changing workout intensity. Milavan states the same 30-minute interval, but its eight named sports modes make it the more activity-focused choice.
The ring is listed as waterproof to 80 meters and suitable for swimming and workouts. Battery life is two to three days, extending to five or more days with the charging case; that case can reduce charging interruptions if it is included as described in the product details. This is a shorter standalone range than Mirlray’s up to five days and Oura Ring 4’s five to eight days, so charging habits matter. No subscription is required, which keeps app access simpler than Oura’s membership model.
BIEMHA makes most sense for general wellness habits rather than detailed exercise analysis. It has a useful spread of everyday metrics and a stated water rating, but the description offers fewer tracking categories than Mirlray and less workout structure than Milavan. As with any ring, I would check the sizing guidance carefully before ordering; the listing itself calls out careful measurement to avoid a poor fit.
Pros:- Tracks sleep, daily activity, steps, calories, and heart rate.
- No app subscription is required.
- Listed waterproofing is up to 80 meters.
- Battery can extend beyond five days with the charging case.
Cons:- Heart rate is checked every 30 minutes rather than continuously.
- Standalone battery life is listed at two to three days.
- Careful sizing is needed before purchase.
Best for: Buyers who want basic sleep and daily activity tracking, water resistance, and no app subscription.
Not ideal for: People who want continuous heart rate monitoring, named workout modes, or a longer stated battery life without a charging case.
- Brand, color, and listed size:BIEMHA, silver, size 7
- Compatibility:iOS and Android
- Tracking:Sleep quality, daily activity, steps, calories, and heart rate
- Heart rate interval:Every 30 minutes
- Waterproofing:Up to 80 meters
- Battery life:2 to 3 days; 5+ days with charging case
- Subscription:None required
Our verdict“I would choose BIEMHA for simple subscription-free tracking and swim-friendly use, provided its intermittent heart rate checks meet my needs.”
Oura Ring 5 Smart Ring, Silver, Size 7
The supplied listing presents the Oura Ring 5 as the broadest tracking package here: more than 50 health metrics, integrations with over 40 apps, and six to nine days of battery life. If those details describe the exact model being considered, it has a longer stated battery range than the Ring 4 listing and a broader integration count than any of the subscription-free alternatives. Its all-titanium construction is described as scratch-resistant and comfortable, positioning it as a premium everyday wearable.
There is a practical complication: this roundup is centered on Oura Ring 4, and the provided product information does not explain the Ring 5’s relationship to that model or establish which features differ between generations. I would verify the model name and exact listing details before choosing it over Ring 4. Both Oura entries require membership after the included first month for new members, while Milavan, Mirlray, and BIEMHA state that no subscription is required. That recurring access requirement is the main ownership tradeoff.
Compared with Ring 4, Ring 5’s stated battery range reaches one day longer at the upper end and it names more app integrations, but the supplied Ring 4 description lists activity features such as workout memory and GPS geotagging more specifically. For that reason, I rank Ring 4 higher for a buyer whose search is specifically about fitness tracking with Oura Ring 4. Ring 5 is a conditional premium alternative for someone who confirms the exact product and values the stated integration breadth and battery range.
Pros:- Listing states more than 50 health metrics.
- Integrates with over 40 apps.
- Battery life is listed at six to nine days.
- All-titanium design is described as scratch-resistant and comfortable.
Cons:- Membership is required after the first month for new members.
- A sizing kit is needed to find the right fit.
- The supplied information does not clarify its differences from Oura Ring 4.
Best for: Buyers who have verified the exact Oura Ring 5 listing and prioritize broad metrics, app integrations, and longer stated battery life.
Not ideal for: Shoppers specifically seeking Oura Ring 4, buyers avoiding recurring membership, or anyone who cannot confirm the model details.
- Material and color:All titanium, silver
- Listed size:Size 7
- Health metrics:More than 50
- App integrations:More than 40
- Battery life:6 to 9 days
- Membership:First month included for new members; subscription required afterward
- Fit:Sizing kit recommended
Our verdict“I would consider Oura Ring 5 only after verifying the model details, since this comparison specifically favors Ring 4 for its stated fitness features.”
How We Picked
I ranked these rings for the specific job of fitness tracking, prioritizing the stated activity features, the usefulness of health and sleep data, and how often the ring needs charging. I also compared water resistance, phone compatibility, app access, and whether a recurring subscription is part of the product’s stated terms. These details shape daily ownership as much as the sensor list: a ring used for swimming or several sports has different needs from one worn mainly overnight.
The descriptions provide different levels of evidence. Milavan lists eight named sports modes, while Oura Ring 4 names daily workout memory and GPS geotagging; BIEMHA gives a specific heart rate interval of every 30 minutes. I used those distinctions to assign roles instead of treating every health feature as equivalent. Where a listing does not specify sensor frequency, continuous tracking, or a detail such as charging case inclusion, I do not assume it.
Oura’s broader metrics and integrations give it the most capable stated tracking package, but the required membership after the introductory month affects its position for buyers seeking a low-commitment ring. Subscription-free alternatives rank well for straightforward ownership, though their descriptions offer fewer details about training analytics. This is a comparison of the supplied product information, not a claim of hands-on testing or a medical assessment. The listed rings are fitness and wellness devices; their data should not be treated as a diagnosis.
| smart ring for fitness tracking oura ring 4 | Color and listed size |
|---|---|
| Oura Ring 4 Smart Ring | Silver, size 10 |
| Mirlray Smart Ring Health Trac | Rose gold, size 8 |
| Milavan Smart Health Ring Fitn | Rose gold, size 8 |
| BIEMHA Smart Ring Health Track | — |
| Oura Ring 5 Smart Ring | — |
Factors to Consider When Choosing Smart Ring For Fitness Tracking Oura Ring 4
I would choose a smart ring by matching its tracking detail and ownership requirements to my actual routine. A long sensor list only helps if the app gives me information I will use, the ring fits comfortably, and its charging and membership arrangements work for me.Decide how much workout detail you need
If I want activity labels for particular exercises, Milavan’s eight sports modes are the clearest match in this group. Oura Ring 4 instead highlights daily workout memory and GPS geotagging alongside its broader health metrics, making it more suitable for someone who wants exercise included in a larger health picture. BIEMHA describes general activity tracking, while Mirlray lists steps and wellness measures without naming workout modes. These descriptions do not establish that any ring replaces a dedicated sports watch for live workout data.
Check the heart rate information
Heart rate frequency affects how useful readings may be around a workout. BIEMHA and Milavan specify checks every 30 minutes, which can provide periodic context but may miss short changes in effort. Mirlray lists heart rate tracking without giving an interval, and the Oura descriptions list broad metric sets without stating a sampling schedule here. I would compare the app’s available workout views and confirm measurement details in the exact product documentation if frequent readings are a priority.
Match water resistance to your routine
For regular swimming, I would favor a listing with a stated water rating and check the maker’s use guidance. Mirlray specifies 10ATM and says it is suitable for swimming and showering; BIEMHA lists waterproofing up to 80 meters and says it suits swimming and workouts. Milavan’s supplied description does not state water resistance, so I would not assume it is swim-ready. A water rating also does not answer every question about soaps, hot tubs, or long-term wear.
Compare battery life and charging
The stated ranges run from BIEMHA’s two to three days without its charging case to six to nine days for Oura Ring 5. Oura Ring 4 lists five to eight days, Mirlray up to five days, and Milavan three to five days with a one to two hour charge time. BIEMHA says its charging case extends use to five or more days. I would think about when I can charge: a ring worn overnight for sleep tracking needs a charging routine that does not interrupt the nights I want to record.
Account for app access and membership
Oura requires membership after the included first month for new members, according to both supplied Oura descriptions. BIEMHA, Milavan, and Mirlray state that their app access does not require a subscription. That difference can outweigh a feature advantage if I want ongoing access without a recurring fee. Before buying, I would check which app features are available without membership and whether the subscription terms shown for my region and account match the listing.
Get the fit right before ordering
A ring needs a secure, comfortable fit for daily wear and useful sensor contact. The Oura listings call for a sizing kit, and BIEMHA and Milavan also advise checking size carefully. Do not treat a listed size as a universal standard: ring sizing and fit can vary by brand, finger, and time of day. I would follow the exact model’s sizing instructions and decide which finger I plan to wear it on before ordering.
Frequently Asked Questions
Is Oura Ring 4 the best smart ring here for fitness tracking?
For a buyer who wants fitness features inside a broad health-tracking app, Oura Ring 4 is my leading pick. Its description includes more than 50 health metrics, daily workout memory, and GPS geotagging. Milavan may suit someone better if named sports modes and no subscription matter most, while Mirlray is the more clearly specified choice for swimming. Oura’s membership requirement after the included month for new members is part of that decision.
Which ring in this comparison does not require a subscription?
BIEMHA, Milavan, and Mirlray each state that no subscription is required for app access. Both Oura listings include a first month for new members and require membership afterward. I would still check the current app terms for the exact product and region, since feature access can differ from the basic claim that no subscription is needed.
Which option is best suited to swimming?
Mirlray R02C explicitly lists 10ATM water resistance and suitability for swimming and showering. BIEMHA also describes the ring as waterproof up to 80 meters and suitable for swimming. The Milavan information supplied here does not give a water rating, so I would seek confirmation before using it in water. I would follow each manufacturer’s guidance for exposure beyond ordinary swimming.
Do these smart rings provide continuous heart rate tracking?
The available descriptions do not support a claim that all five track heart rate continuously. BIEMHA and Milavan specify a 30-minute interval; Mirlray lists heart rate tracking without a sampling schedule, and the Oura descriptions do not state one here. If readings during an entire workout are important, I would confirm the exact model’s tracking behavior before choosing a ring.
How should I choose a ring size?
I would use the sizing instructions for the exact brand and model before ordering. Both Oura products call for a sizing kit, and BIEMHA and Milavan also advise checking finger size carefully. A comfortable, secure fit matters for all-day wear and sensor contact, and a size listed for one model should not automatically be assumed to fit another brand the same way.
Conclusion
My recommendation depends on what I want the ring to do. For the broadest stated fitness and wellness package, I would choose Oura Ring 4, accepting the membership requirement after the included first month for new members. For named activities and subscription-free app access, I would choose Milavan. For swimming with several wellness measures, Mirlray is the better fit; for basic sleep and daily activity tracking with a charging case option, BIEMHA is the simpler alternative. I would consider Oura Ring 5 only after confirming the exact model details, especially if I am shopping specifically for Ring 4.
