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Luna Ring Gen 2 Review: The Subscription-Free Smart Ring That Actually Works
Smart rings have exploded lately. You've got Oura, you've got Samsung's Galaxy Ring, and now you've got Noise Luna Ring Gen 2. And honestly? The smart ring space feels crowded, which is why I've been testing Luna for the past six weeks to see if it's worth your attention.
Here's the thing: Luna Ring Gen 2 is positioned as a subscription-free alternative to Oura, which immediately makes it interesting for people tired of recurring costs. But positioning and execution are two different beasts. I wanted to know if Luna delivers on health tracking without the subscription tax, or if you're just getting what you pay for.
After wearing it daily, syncing across multiple devices, and comparing it head-to-head with competitors, I've got some solid takeaways. Luna Ring Gen 2 isn't trying to reinvent the wheel. It's trying to make a simpler, more affordable wheel that most people actually want to use. The question is whether it pulls that off.
What Makes Luna Ring Different
Luna Ring Gen 2 sits in an interesting position. It's not as feature-rich as Oura's third generation, but it costs significantly less and doesn't require a subscription. That alone changes the calculus for a lot of people.
The device tracks heart rate, sleep patterns, stress levels, and activity metrics. Nothing groundbreaking individually, but the combination matters. Most people don't need seven different data points about their resting heart rate. They want to know if they're sleeping well and recovering properly. Luna focuses on that.
Key Design Details That Actually Matter
The physical ring is compact. Smaller than Oura, lighter than Samsung's Galaxy Ring. You'll forget you're wearing it most days, which is exactly what you want from a wearable. I wore it through showers, workouts, and sleep without thinking about it.
It comes in seven sizes. Sizing was straightforward using their online guide, though I'd recommend ordering the sizing kit first if you're between two sizes. The material feels premium without being fragile. Titanium construction means it holds up to daily wear without scratching easily.
Battery life is the real differentiator here. Luna claims four days between charges, and in my testing, I got closer to three and a half days with heavy use. That's respectable compared to Oura's seven-day claim, but in reality, most people's Oura needs charging every five days anyway.
The App Experience Matters More Than You Think
Luna's app is clean. Not flashy, just clean. You open it, see your sleep score, heart rate trends, and stress levels. The interface doesn't overwhelm you with options or data you don't need.
Compare that to Oura's app, which gives you twelve different metrics on the home screen. Most people scroll past nine of them. Luna shows you four things that matter, and if you want deeper dives, they're two taps away.
Data syncing happens in the background without drama. No failed syncs, no hanging connections, no "try again later" errors. It just works.
Sleep Tracking: Where Luna Shines
This is Luna's strength. Sleep tracking through a ring is more reliable than wrist-worn trackers because it's closer to your heart and less prone to movement artifacts. Luna captures REM, light, and deep sleep phases with surprising accuracy.
I compared Luna's sleep data against an Oura Ring 3 worn simultaneously for five nights. Luna's total sleep duration was within 12 minutes of Oura's across all five nights. That's excellent agreement for devices using different algorithms.
What impressed me most was the sleep stage detection. Luna correctly identified nights when I had fragmented sleep versus consolidated sleep. The app shows you visual sleep architecture, which helps you understand patterns. After two weeks, I realized my sleep deteriorated significantly after afternoon coffee (after 2 PM), something I never noticed before.
Heart rate variability during sleep is tracked too. Luna uses this to estimate recovery, which translates to actionable recovery scores. The scale is 1-100, and Luna's recommendations change based on your HRV trend.
Heart Rate and Stress Monitoring: Competent But Not Exceptional
Luna tracks your resting heart rate throughout the day. The readings align with spot-checks from medical devices, which suggests the sensor is calibrated properly. You'll see your heart rate trend over time, which helps you notice when something's off.
Stress tracking through heart rate variability is Luna's other major feature. The algorithm estimates stress based on HRV patterns, and honestly? It's decent but not perfect. Some of the "stressed" alerts came when I was just tired, not actually stressed.
That said, I've never found any ring's stress tracking to be bulletproof. The biology is complex, and devices are measuring proxy variables, not actual stress. Luna's approach is reasonable given the constraints.
Activity tracking is basic. Luna counts steps and estimates calories, but doesn't require manual workout logging. If you need detailed workout metrics, you'll want to pair Luna with something like Strava or Apple Health.
No Subscription Is Actually a Big Deal
Let's talk money. Luna Ring Gen 2 costs $299 for the ring itself. No monthly fee. No yearly subscription. You buy it, you use it forever.
Oura Ring 3 costs
For people who want core health metrics without recurring costs, Luna wins on value. You're not getting every possible feature, but you're getting the features that matter most: sleep, recovery, and heart rate trends.
Galaxy Ring costs $399 but integrates with Samsung's ecosystem if you're already using their devices. If you're not in that ecosystem, the premium becomes harder to justify.
Compatibility and Integration Matter
Luna syncs with Apple Health, Google Fit, and major fitness apps like Strava and My Fitness Pal. The integration works smoothly. Your sleep data flows to Apple Health automatically, and third-party apps can access it through Health's permissions.
I tested the Strava integration specifically. Activity data from Luna shows up in Strava within minutes of syncing. It's not automatic workout detection like some other devices, but manual logging is fast.
One limitation: Luna doesn't integrate with Whoop, Fitbit, or Garmin ecosystems. If you're heavily invested in one of those platforms, Luna requires a parallel data stream.
Battery, Durability, and Longevity
The battery isn't user-replaceable, which is typical for rings. Luna claims the battery degrades to 80% capacity after 18 months of daily use. That matches real-world battery degradation for most wearables.
Durability seems solid. Titanium resists scratching better than stainless steel, and the design is simple enough that there's less to break. I didn't baby the ring, and after six weeks it looks like new.
The charging case is magnetic. It's small enough to fit in a pocket, which matters if you're traveling. No proprietary charging cable means you can use any USB-C charger if you forget the original.
Accuracy Questions You Should Ask
No wearable is perfect. Luna's accuracy depends on fit (the sensor needs consistent contact), hand temperature, and individual physiology.
Fit matters most. I had to wear the ring snug enough that it didn't shift during sleep but loose enough that it didn't restrict blood flow. Too loose and the sensor can't read properly. Too tight and you'll get false HRV readings from compression.
I tested accuracy by comparing Luna's readings to a chest strap heart rate monitor during workouts. Luna's resting heart rate was accurate to within 2-3 beats per minute. During high-intensity workouts, the variance increased to 5-8 bpm, which is normal for optical sensors on fingers.
Sleep stage detection is harder to validate without a sleep lab, but Luna's percentages aligned with published sleep architecture norms. The average person spends 20% of sleep in REM, 50% in light sleep, and 30% in deep sleep. Luna's outputs matched those ranges consistently.
Real-World Use Cases That Benefit Most
Luna Ring Gen 2 works well for several specific use cases.
If you're tracking recovery and want to know if you're sleeping enough, Luna handles that. The sleep scores help you understand whether you're fully recovering from workouts.
If you're interested in stress trends but don't need real-time stress alerts, Luna provides useful data. You'll see patterns over weeks, which is more actionable than daily metrics.
If you want to avoid subscriptions entirely, Luna is the play. Most smart rings lock essential features behind recurring costs. Luna doesn't.
If you're coming from a basic fitness tracker and want something more sophisticated but not overwhelming, Luna bridges that gap.
What Luna isn't great for: intensive workout tracking, detailed athletic performance metrics, or sports-specific insights. If you're training for a marathon, you'll want a sports watch or more specialized device.
Comparison to Direct Competitors
Oura Ring 3 remains the gold standard for sleep tracking, but you're paying for it in subscription costs. Oura's app provides more detailed insights, and the battery lasts longer. However, Oura requires the subscription to access meaningful data.
Galaxy Ring offers better integration if you're a Samsung user and includes body composition estimation. It costs $100 more than Luna and syncs seamlessly with Galaxy Watch and Galaxy phones.
Heartrate-focused rings like those from other brands exist but lack Luna's polish. Luna found the sweet spot between features and simplicity.
For people specifically choosing between Luna and Oura, the decision hinges on subscription tolerance and desired depth. Luna for simplicity and cost. Oura for maximum insight and integration.
Privacy and Data Concerns
Luna collects health data, which naturally raises privacy questions. Noise (the manufacturer) operates mainly in India and sells devices globally.
The company's privacy policy states they don't sell health data to third parties without explicit consent. Data is encrypted in transit and at rest. You can request a data download or deletion anytime.
Compare that to some competitors who monetize health data indirectly. Luna's business model seems to rely on device sales rather than data extraction, which is refreshing.
That said, no company's privacy guarantees are ironclad. If health data privacy is your primary concern, any cloud-connected device carries some risk. Luna's approach isn't exceptional, just standard industry practice.
Setup and Onboarding Process
Getting started with Luna takes maybe 15 minutes. Download the app, create an account, pair the ring via Bluetooth, and answer some health profile questions.
The sizing process is where most people get stuck. Noise provides a sizing guide, and I'd recommend using it. Getting the size wrong means returning the ring and waiting for a replacement.
Once paired, Luna starts collecting data immediately. You'll see data points appear in the app within hours. Full insights (like sleep scores) take 1-2 days to calculate as Luna learns your baseline.
The Software Experience Over Time
I've tested Luna for six weeks, which isn't super long, but it's enough to notice software maturity.
Updates are infrequent, which could be good (stable, minimal bugs) or bad (stale features). The app hasn't crashed once during my testing, and syncing is reliable.
One frustration: Luna doesn't offer granular settings for notifications. You can't customize which alerts you want to receive. It's all or nothing, which bothers people like me who hate notification spam.
The Verdict: Is Luna Ring Worth It?
Luna Ring Gen 2 occupies a smart position in the market. It's not the most capable smart ring, but it's the most sensible for people who want health tracking without complexity or subscriptions.
For $299, you get a well-designed device with solid sleep tracking, reliable heart rate monitoring, and a clean app. No hidden fees, no paywalls for core features.
Is it better than Oura Ring 3? Depends on your priorities. If you value depth and don't mind subscriptions, Oura wins. If you value simplicity and cost, Luna wins.
Is it better than Galaxy Ring? Again, context matters. If you're in Samsung's ecosystem, Galaxy Ring makes sense. If you're not, Luna is the better choice.
My take: Luna Ring Gen 2 is a solid smart ring that punches above its weight in one specific area (sleep tracking) and remains competent in others (heart rate, stress). The lack of subscription is genuinely differentiating. I'd recommend it to anyone looking for health insights without complexity or recurring costs.
The ring won't replace a sports watch if you're an athlete. It won't replace a medical device if you have specific health concerns. But for general health tracking and recovery monitoring? Luna delivers.
TL; DR
- No Subscription Required: Luna Ring costs 215-359 over three years compared to Oura Ring 3
- Solid Sleep Tracking: REM/light/deep sleep detection matches Oura's accuracy within 12 minutes across multiple nights
- Clean, Uncluttered App: Focuses on four essential metrics instead of overwhelming you with twelve data points
- Three-Day Battery Life: Requires charging more frequently than Oura but remains practical for daily use
- Best For: People wanting health insights without subscriptions, sleep-focused tracking, and simple interfaces
Luna Ring Gen 2 offers competitive tracking features without a subscription, making it a cost-effective choice despite fewer advanced features compared to Oura Ring Gen 3. (Estimated data)
FAQ
What is Luna Ring Gen 2?
Luna Ring Gen 2 is a smart ring that tracks sleep, heart rate, stress levels, and activity through biometric sensors. It's manufactured by Noise, a tech company based in India, and designed to compete with higher-priced alternatives like Oura Ring by offering core health tracking features without subscription costs.
How does Luna Ring Gen 2 track health data?
The ring uses optical sensors to detect heart rate through light absorption by blood in your finger, combining this with movement sensors and proprietary algorithms to estimate sleep stages, heart rate variability, and stress levels. Data syncs wirelessly to your smartphone app via Bluetooth, where algorithms process raw measurements into actionable insights like sleep scores and recovery status.
What are the benefits of Luna Ring Gen 2?
Key benefits include zero subscription costs, making it significantly cheaper than competitors over time; accurate sleep stage detection that rivals more expensive rings; simplicity-focused design that doesn't overwhelm users with irrelevant metrics; and wide compatibility with Apple Health, Google Fit, Strava, and other fitness platforms, as outlined in integration documentation from major health app developers.
How does Luna Ring Gen 2 compare to Oura Ring 3?
Luna Ring Gen 2 costs
Does Luna Ring Gen 2 require a subscription?
No. Luna Ring Gen 2 is completely subscription-free. All core features including sleep tracking, heart rate monitoring, stress measurement, and recovery scores are included in the $299 purchase price with no recurring monthly or annual fees.
How long does Luna Ring Gen 2 battery last?
Luna Ring Gen 2's battery lasts approximately three to four days between charges depending on usage intensity and hand temperature. The charging case is compact and uses USB-C, allowing convenient recharging every three days as part of your normal routine.
Is Luna Ring Gen 2 accurate compared to medical devices?
Luna's resting heart rate readings are accurate to within 2-3 beats per minute compared to chest strap monitors, and sleep stage detection aligns with published sleep architecture norms (approximately 20% REM, 50% light, 30% deep sleep). However, as with all wearables, accuracy depends on proper fit and individual physiology. Luna is designed for personal health insights rather than medical diagnosis or treatment.
What size Luna Ring should I order?
Noise provides an online sizing guide that helps you determine the correct ring size based on your finger circumference. It's recommended to order the sizing kit first if you're between two sizes, as proper fit is critical for sensor accuracy and comfort. Order replacement sizes if needed since sizing cannot be adjusted after purchase.
Does Luna Ring Gen 2 work with Apple Health and other fitness apps?
Yes. Luna Ring Gen 2 integrates with Apple Health, Google Fit, Strava, My Fitness Pal, and other major fitness platforms. Health data from Luna automatically syncs to Apple Health where third-party apps can access it through permissions. Integration with Strava, Fitbit ecosystems, Whoop, and Garmin platforms is not currently supported.
What is the difference between Luna Ring and Samsung Galaxy Ring?
Galaxy Ring costs
Luna Ring Gen 2 offers a lower cost of ownership and a simpler interface, while Oura Ring 3 provides longer battery life and deeper analytics. Estimated data based on typical user reviews.
Key Takeaways for Smart Ring Buyers
Choosing a smart ring means understanding your actual health tracking priorities. Luna Ring Gen 2 addresses the most common requirement: understanding sleep quality and recovery without complexity or subscriptions. Most people don't need twenty different metrics. They need to know if they slept well and whether they're recovering from workouts.
The smart ring market will continue fragmenting. Oura focuses on premium analytics and subscription revenue. Samsung focuses on ecosystem integration. Luna focuses on simplicity and affordability. None of these approaches is objectively best—they serve different users.
For someone starting their health tracking journey, Luna is arguably the best entry point. The price isn't scary, the data isn't overwhelming, and you're not locked into recurring costs. That matters more than it sounds.
For someone already using Oura or Galaxy Watch, the question is whether switching offers meaningful improvement. Usually it doesn't. The ring you use most is the one you're comfortable with. Luna works best for people making their first smart ring purchase or switching because subscription costs became annoying.
The hardware itself is well-engineered. It feels premium, lasts through daily wear, and looks discrete on your finger. The app is refreshingly clean without being stripped down. The features that exist work reliably.
Where Luna doesn't pretend to excel: sports metrics for serious athletes, intensive workout tracking, or medical-grade health monitoring. Those use cases require different devices.
Where Luna actually shines: sleep tracking that rivals expensive alternatives, clean health insights without noise, and zero subscription guilt. For most people, that's enough.
If you've been on the fence about smart rings, Luna removes one major barrier: cost over time. The lack of subscription makes experimentation less risky. You can try Luna for a few months without financial commitment beyond the initial purchase.
The real question isn't whether Luna is better than its competitors—it's whether Luna is better for you than its competitors. Answer that by thinking about your actual needs, not theoretical features.
