At CES 2025, I visited the Noise both, a company from India that claims to be a leading brand in that country. While Noise launched the Luna Ring 2.0 at the show, I was given an original Luna Ring to test and get an idea of how the ecosystem works. At the heart of the device is AI-driven insights that monitor biomarkers for health and wellness and provide helpful details relating to your personal metrics.
What is the Noise Luna Ring?
Backed by Bose as a strategic investor, the Noise Luna Ring launched in July 2023 (the Luna Ring 2.0 is scheduled for release in March 2025). Worn on your index, middle, or ring finger like any other smart ring, it provides three core scores for Sleep, Readiness, and Activity. In total, it tracks more than 70 metrics using advanced sensors on the underside.
Measuring just 3mm, the ultra-lightweight device is made of fighter jet-grade titanium with a diamond-like coating to resist scratches and corrosion. The inner shell is hypoallergenic, containing the infrared Photoplethysmography (PPG) sensors, skin temperature sensors, and three-axis accelerometer sensor. It employs an optomechanical design that combines three LEDs and two PDs, powered by Philips Biosensing, along with mechanical components (three bumps) ensuring correct alignment of the optical sensors with your finger.
Through the three core scores that are calculated, you are given intelligent guidance, like how to optimize your nightly rest patterns, to be in tune with your body and work out when needed or rest when necessary, and get details about activity levels, inactivity, and recovery. The temperature sensor can use information gathered to provide insights about diet, exercise, physiological states, and hormones, with the data captured every five minutes. The ring also reads heart rate and SpO2.
With no subscription requirement, you get all this data and insights in the free NoiseFit app, which is compatible with iOS 14 and above and Android 6 and above. The ring uses Bluetooth low energy, is water-resistant down to 50 metres, and runs for up to seven days on an hour charge. It comes in seven sizes and five finishes: Sunlit Gold, Rose Gold, Stardust Silver, Lunar Black, and Midnight Black and sells for US$300.
Luna Ring Review: Set-Up and The App
I unboxed the Luna Ring and was impressed with the psychedelic packaging. It makes you feel like you’re about to wear something totally cool. My unit is finished in Lunar Black. It looks rather basic, a bit wider than I’d like but still fits comfortably on my finger. I got a size nine, which is slightly too big, but I found the size eight I tried on at the show to be slightly too tight. Without half sizes, I would recommend going with the tighter version since your finger tends to fluctuate in size throughout the day, week, and especially time of month for women. With that said, while mine fits loosely, it is still relatively secure and takes measurements effectively.
I charged the ring, downloaded the app, and paired the ring with my phone, then I let it do its thing for a few weeks to capture enough data to provide useful insights. This includes my regular daily activity, exercise, sleep patterns, resting heart rate, SpO2, and more along with manually inputted stats like age, weight, and height.
The ring captures a lot of data and going through the app can be overwhelming. There are several tabs to view metrics separately, including a home page, sleep, readiness, and activity. There’s also a Luna AI tab where you can set up plans and view a daily health digest. The digest is wonderful, but it cycles so quickly through each page requiring that I re-watch or flip back to fully read the summary.
It takes some time to get used to all the data provided in the app, and to analyze it all. Over time, you’ll likely decide what’s most important to you and hone-in on that, like sleep stage analysis and activity score. Along with scores and figures, you also get helpful advice. For example, one day I was told that my heart rate and skin temperature were elevated and I should take it easy and “focus on what feels good to help regain balance and give yourself time to recover.” Another day, I was told that my readiness score was in great shape and I “might want to push a little more towards your fitness goals.”
Luna Ring Review: Logging Activities, Workouts, and Sleep
It’s simple to record workouts, but the list is limited to 10 options, including walking, running, cycling, tennis, and badminton. Since most of what I do is either indoor cardio or strength training, I had to choose “freestyle workout” for each one. Interestingly, however, if you manually add a workout after the fact, there are more workout styles to choose from, including dancing, stretching, HIIT, strength training, and boxing.
Noise explains that you see fewer options when recording a workout because the ring needs to calibrate and live calculate calories. “During manually submitting a workout, since the ring is only logging your workout, there is no complex algorithmic calculation involved and it’s a simpler calories calculation based on effort that a user submits,” a company representative tells me. “Hence, we are able to showcase a bigger range of workouts.”
With that said, Noise is working on adding new workouts every month, but says for now, choosing “freestyle workout” as a default will still give you 95% accuracy when it comes to calorie burn. Nonetheless, this is worth keeping in mind if you like to keep track of what specific workouts you did when.
Another small detail to consider: you can only log workouts that are at least 20 minute in length. I discovered this after doing a short 10-minute kickboxing sessions before going for a morning walk. The ring would not allow me to add it.
When it comes to sleep data, the ring not only captures the hours of sleep you got but also how much you need, a breakdown of REM, deep, awake, light, and efficiency, five key metrics while sleeping (respiratory rate, resting heart rate, Sp02, heart rate variability, and temperature), movements, restorative sleep, and even sleep trends. This gives you a comprehensive picture of detailed nightly insights and helps you track your sleep improvements (or regressions) over time. You also get information about your circadian midpoint, which advises of your body’s internal clock to help you understand your natural sleep patterns and rhythms. If this midpoint is too late in the night, you’re advised to adjust your sleep schedule to better reflect your natural rhythm.
Activity tracks progress towards calorie burning goals each day, though it doesn’t appear as though you can adjust these goals. You’ll also see steps and distance, as well as progress towards things like move goals (to move every hour), training frequency and volume. For workouts, view a detailed summary that notes the duration, calories burned, maximum, minimum, and average heart rate, a breakdown of heart rate zones, and helpful insights. For example, with one workout, I was told that I spent 11.5 minutes at 60-70% of my max HR which “benefits endurance and burns fat.” It’s a nice touch that notes address me by name.
Since I synced the smart ring to my Apple Watch app, I was able to compare data provided for workouts right in the Apple Fitness app. The Luna Ring consistently recorded a higher calorie burn than the Apple Watch. For a short walk, both recorded the identical average heart rate but this time oddly, the Luna Ring recorded a lesser calorie burn.
With sleep, data is fairly in line. One night, Apple Watch recorded that I spent six hours and 49 minutes in bed, six hours and 37 minutes asleep with four hours and 21 minutes in core (light) sleep, an hour and 21 minutes in REM, 45 minutes in deep sleep, and 12 minutes awake. For this same night, Luna Ring recorded six hours and 41 minutes asleep, with 54 minutes in REM sleep and an hour and 32 minutes in deep. (Other figures are indicated as a percentage with increases and decreased related to the last seven days). Interestingly, this switch in figures between REM and deep sleep is something I see often when comparing Apple Watch to other smartwatches and smart rings. For some reason, what Apple Watch tracks as REM, many other devices consider deep sleep.
Luna Ring Review: Stand-out Features
Arguably my favourite thing about this smart ring is the battery life: it lasts quite a long time, much longer than any other smart ring I have reviewed to date. I’ll easily get four-to-five days per charge, a welcome respite from ones you have to charge daily. It sits flat on the included charger, which often requires some fiddling to get the positioning and alignment of the sensors just right. I wish it came with charging case like true wireless earbuds for easy charging on the go.
Another appreciated feature is Find my Ring. One day while out and about, I noticed the ring wasn’t on my finger and panicked that I had lost it. Did it fall off somewhere when I took off my winter gloves? Accessing the Fin my Ring feature in the app, I was able to pinpoint its location to my home address, reassured that it was at least somewhere in the house.
The AI integration is also a stand-out feature. On any screen, you can tap the “ask Luna AI” button to get more details about something. You can ask Luna questions either by choosing “Ask Luna AI” and typing or by voice for a written or audible response. For example, I was concerned on the day I had a higher body temperature and asked if that might mean I was getting sick. The reply noted that this could be fever or infection, or simply increased blood flow due to exercise or external heat exposure. It prompted me to stay hydrated and get rest if I experience any symptoms of a fever. Since my temperature was still below fever levels, I ignored that and continued with my day.
However, it isn’t foolproof. For example, at times, I would receive conflicting information, like when asking why active and total calories are the same (one reply said it had to do with the type of workout and another to check for a firmware update). On another occasion, I asked Luna AI to analyze my sleep from the night prior and it said there was no sleep data recorded even though there was. (This feature later worked on another day). Nonetheless, it’s a useful option if you want to ask for quick things like suggestions for delicious smoothies, advice on how to improve your sleep, learn more about how to lower your resting heart rate, or get back stretch recommendations.
What else I love about this ring is that it tracks so much data and gives you so much insight without requiring a subscription. Considering top brands like Oura still require a monthly recurring subscription to get the most out of it, this is a huge bonus. Once you pay the price of entry, that’s it.
Should You Buy The Noise Luna Ring?
The Noise Luna Ring smart ring is one of the most feature-rich, comprehensive smart rings I have reviewed to date. While it isn’t quite as sleek and nice-looking as some others, like the Amazfit Helio Ring, it does a fantastic job of capturing tons of metrics and data, all from your finger.
The generous battery life is appreciated. It’s comfortable to wear all day and night. The app is responsive and Luna AI a nice touch. I’d recommend this ring for someone who wants to get as much detailed data about their health and wellness as possible. While I still wear a smartwatch alongside it, you could easily rely on this smart ring alone and not need a smartwatch at all if you prefer to go that route.