The Oura Ring 4 arrives at a time when smart rings are finally beginning to move beyond niche appeal. If there is such a thing as a “smart ring revolution”, Oura is arguably the brand that set it in motion. For some users, this device could well mark the beginning of a more consistent and less intrusive way of tracking personal health. The Finnish company has been present in global markets for years, but its availability in India (launched earlier this month) is an important step in expanding the category.
At its core, the Oura Ring 4 is designed to measure activity, sleep and a wide range of physiological metrics, including heart rate, skin temperature and respiratory rate. It works seamlessly with both iPhone and Android devices, with all data managed through a companion app. The availability of sizes ranging from 4 to 15 also makes it more inclusive than many rival smart rings, which often cater to a narrower set of users.
Design, comfort and hardware refinements
Compared to the previous generation, the Oura Ring 4 adopts a noticeably sleeker and more refined design. The inner surface of the titanium frame has been redesigned to remove protrusions, with flat sensors integrated more seamlessly. This means the ring can be worn without worrying about its exact orientation, as it can slightly rotate while still maintaining accurate readings. The benefit is immediately apparent during sleep, where comfort becomes critical for consistent usage.
The updated sensing technology introduces a more advanced algorithm that adapts readings based on the individual user’s finger. The number of signal pathways has been increased significantly, allowing the ring to identify, in real time, the most accurate and unobstructed measurement path. This dynamic selection helps improve overall accuracy and reduces gaps in data collection — an important factor when tracking sleep and stress over longer periods.
Battery life remains one of the device’s strongest aspects. Oura claims up to eight days on a single charge, and in practical use, it delivered close to seven days. In everyday scenarios, this creates a sense of reliability, as users do not need to constantly think about charging. Even accounting for battery degradation over time, it is likely to remain ahead of most smart rings currently available. This stands in contrast to devices such as the Apple Watch, which typically require charging every couple of days (at times less).
The charging base itself is simple but thoughtfully designed. Its squarish shape and metallic finish make it less likely to be misplaced. The battery inside the ring is understandably small, but it strikes a balance between capacity and form factor — something that would be compromised if the ring were made thicker simply to extend battery life.
Software experience and health insights
If hardware lays the foundation, the software experience is what defines the Oura Ring 4 in daily use. The companion app is among the more polished health platforms available, with a clear structure built around three sections: Today, Vitals and My Health.
The Today tab functions as a dynamic homepage, presenting relevant information at a glance. Shortcut tiles provide quick access to detailed metrics, while rotating “spotlight” cards surface insights based on the time of day. A timeline view adds further depth, allowing users to track how different health metrics evolve over the course of a day. Importantly, users can log contextual inputs — such as caffeine intake, alcohol consumption or even vaccinations — which helps improve the accuracy and relevance of the data.
Vitals focuses on stable, day-to-day health indicators, including activity levels, sleep quality and readiness scores. Meanwhile, the My Health section offers a broader perspective, highlighting trends such as resilience, heart health and vascular age. It is also where users can access longer-term reports, including monthly and yearly summaries.
Oura continues to expand its feature set. Automatic activity detection, combined with heart rate monitoring and heart rate zone analysis, adds practical value for everyday fitness tracking. One of the more useful features is the daytime stress chart, which also maps fluctuations in stress levels against logged lifestyle factors. Over time, this creates a clearer picture of what may be influencing stress and helps users make incremental lifestyle adjustments.
Sleep tracking remains a defining strength. Even over a relatively short period of use, the data can encourage behavioural changes. Eating late at night or consuming alcohol before bedtime, for instance, have a visible impact on sleep metrics. The ring’s ability to highlight these patterns can lead to more mindful habits. Elevated heart rate during sleep, for example, often correlates with poorer sleep quality, and the feedback loop encourages users to make adjustments.
Another key advantage is the form factor itself. Compared to smartwatches, which can feel bulky and intrusive — particularly during sleep — the ring is discreet and easy to wear continuously. This consistency is crucial for long-term health tracking, as gaps in usage can reduce the reliability of insights.
Limitations, pricing and the bigger picture
Despite its strengths, the Oura Ring 4 is not without compromises. The subscription model remains one of the most significant concerns, particularly in the Indian context. While the monthly fee may appear reasonable in markets such as the US or the UK, it feels relatively expensive in India. Over time, the cost adds up, making it an important factor to consider alongside the initial purchase price.
There are also practical limitations. The ring is not well-suited for weightlifting or activities involving heavy metal contact. For users who rely on such workouts, this means missing out on certain data points unless supplemented by another device.
The charger for Oura Ring 4. Picture: Mathures Paul
Comparisons with smartwatches are inevitable. Devices like the Apple Watch offer a broader feature set, including GPS, notifications, safety features and real-time workout tracking. They function almost like miniature smartphones on the wrist. However, they require more frequent charging and are less comfortable to wear during sleep.
The Oura Ring, by contrast, takes a different approach. It focuses on passive, continuous health monitoring without a screen, prioritising long-term insights over real-time interaction. It is less about immediate feedback during workouts and more about building a comprehensive picture of overall health. In that sense, it complements rather than directly replaces a smartwatch for some users.
Accuracy appears in line with devices like the Apple Watch for metrics such as sleep timing, heart rate and movement. However, it is advisable to rely on a single device for consistency, especially for metrics like deep sleep, where variations between devices can occur.
Durability, so far, does not appear to be a concern. The ring has shown no signs of scratching or tarnishing with regular use, even when worn throughout the day and removed only during activities such as bathing.
Ultimately, the decision between devices such as the Oura Ring, a smartwatch or alternatives like WHOOP comes down to personal preference. If the goal is to minimise screen time and prioritise unobtrusive health tracking, the Oura Ring makes a strong case. If real-time fitness tracking and additional functionality are priorities, a smartwatch may be more suitable.
The Oura Ring 4 stands out as a well-designed, comfortable and feature-rich device that excels at long-term health monitoring. Its ability to stay on the body consistently is perhaps its greatest strength, as consistency is key to meaningful health insights. The primary drawback in India remains the subscription cost, which may limit its appeal for some users.
Even so, as a representation of where smart rings are headed, the Oura Ring 4 feels like a mature and thoughtfully executed product... one that quietly does its job in the background while offering increasingly valuable insights over time.