Luna Smart Ring Gen 2 Review: A Fertility and Sleep Tracker That Delivers
Table of Contents
The smart ring market is rapidly evolving, and the Luna Smart Ring Gen 2 arrives with a compelling promise: thorough biomarker tracking, particularly for women’s health. After a previous disappointing experience with a competing device, one tester found the Luna Smart Ring Gen 2 to be a critically important step forward, offering extraordinary battery life and a feature-rich app without the burden of a subscription fee. Announced at IFA 2025, this second-generation wearable aims to help users understand and improve their overall wellness, with a strong emphasis on sleep and fertility.
First Impressions and Setup
The Luna Smart Ring Gen 2 launched in mid-2025 and is available for purchase at £299 / $329. Customers can choose from five colors: midnight black, lunar black, stardust silver, rose gold, and sunlit gold. The ring itself arrives in a petite box alongside a charging cable and several sizes to ensure a pleasant fit. The setup process is straightforward,guided by the Luna app (available on iOS and Android).
The Gen 2 boasts several improvements over its predecessor, including a slimmer design, upgraded hardware, the aforementioned Surge Charger, and the integration of a new Luna AI coach. The ring measures 8mm in width and 2.9mm in thickness, weighing between three and five grams depending on size, and is constructed from titanium. A subtle diagonal stripe adorns the front, or else maintaining a minimalist aesthetic.
While comfortable to wear, the ring’s thickness may be noticeable for those with smaller fingers. Battery life is a standout feature, lasting between four and seven days on a single charge. The Surge Charger extends this significantly, holding up to 30 days of power, ensuring users rarely need to worry about running out of juice.
like other smart rings, the Luna Smart Ring Gen 2 tracks a wide range of health and fitness metrics, including sleep, activity, stress, calories, and recovery. It utilizes an optical heart rate sensor,blood oxygen sensor,PPG sensor,and skin temperature sensor,all housed on the inside of the ring. These sensors periodically flash green and red LEDs while measuring data. The ring is also water-resistant up to 50 meters, making it suitable for handwashing and rain, though swimming is not recommended.
Performance and App Experience
Testing the Luna Smart Ring Gen 2 over a month and a half revealed consistently strong performance. the battery life lived up to expectations, often lasting a full week or more on the initial charge. The Surge Charger proved equally impressive, requiring only a single recharge during the entire testing period.
The app is intuitive and easy to navigate.Users can customize tracking parameters, including fertility data (period dates and contraception details) and daily goals (water intake and step count). The ring syncs quickly and reliably, accurately logging activities like running, walking, and napping. While some data, such as food intake and sleep (if not wearing the ring to bed), requires manual input, the overall experience is seamless. The app also allows for manual addition of workouts that aren’t automatically detected, like HIIT or yoga.
Sleep tracking emerged as a particular highlight. The Luna smart Ring Gen 2 provides detailed breakdowns of sleep stages, duration, and quality, offering personalized suggestions for advancement. Period tracking, while requiring manual symptom input, effectively monitors the menstrual cycle and aids in fertility awareness.The Luna AI coach, while functional, didn’t offer significantly more insightful advice than the app itself.
Verdict: A Strong Contender in the Smart ring Space
The Luna Smart Ring Gen 2 earns high marks for its comprehensive feature set, impressive battery life, and user-kind app. Its focus on women’s health, with valuable insights into fertility and period tracking, sets it apart from many competitors. The lack of a subscription fee is a significant advantage, and the charging solution is arguably the best currently available. While the Luna AI coach could be further refined, it doesn’t detract from the overall positive experience.This is a smart ring that users will genuinely enjoy wearing and utilizing to improve their health and fitness journey.
Alternatives to Consider
For those seeking the best overall smart ring experience, the Oura ring Gen 4 remains the gold standard, though it comes at a higher price point. If sleep tracking is a primary concern, the Ultrahuman Ring Air offers extraordinary features, including Circadian Phase Alignment insights, and also avoids subscription fees.
