Wearable technology is expected to have a major impact on the healthcare industry in the years ahead, and Oura is set to be at the forefront of this trend. The company has become known for its Oura Ring — a screenless, titanium smart ring that uses artificial intelligence and sensors to compile biometric data and deliver personalized insights regarding a user’s heart health, sleep habits and stress levels, among other variables.
What Are Oura Rings?
Oura Rings are smart rings that use sensors and artificial intelligence to discreetly compile and analyze user data, providing personalized insights into health metrics like heart rate, sleep quality and stress levels without a screen. These findings are retained over time, allowing an Oura ring to build on previous knowledge and deliver even more detailed advice and recommendations to users.
Oura has continued to build momentum with the release of its latest Oura Ring 5, reaching an $11 billion valuation that has encouraged it to file for an initial public offering in May 2026. The move reflects the growing popularity of health wearable devices overall, so it’s time to explore how the Oura Ring works and what the consequences of using it are before embracing one of the hottest products in the tech sector.
What Is an Oura Ring?
The Oura Ring is a screenless, titanium smart ring that uses sensors to collect data on more than 50 health metrics, including the wearer’s blood oxygen saturation, heart rate variability, active calories and body temperature. As a result, users can discreetly track how their bodies behave during sleep, exercise and other activities to gain a better understanding of their overall health — without the distraction of a screen.
All of this information is fed into an accompanying app and gets progressively more tailored to an individual over time as the Oura Ring gathers more data. Because it retains information, the ring can build a detailed user profile from historical data and offer increasingly customized recommendations and insights. It’s like a personal assistant guiding each user through their own health journey.
How the Oura Ring Collects Data
Data collection begins with advanced sensors that have been verified by independent, peer-reviewed publications, according to Oura’s site. Each ring contains several types of sensors that focus on distinct biometrics:
- Red and Infrared LEDs: These sensors measure blood oxygen levels during sleep.
- Green and Infrared LEDs: These sensors measure heart rate and heart rate variability around the clock and respiration rate during sleep.
- Negative Temperature Coefficient Sensor: This sensor measures body temperature, tracking any changes and general trends.
- 3D Accelerometer: This sensor uses vibrations to help track a wearer’s movement and physical activity.
Once all of the sensors have compiled the data, the next phase involves Oura’s specialized algorithms. These algorithms are pre-trained on diverse data sets, giving them the context to process data from a wider range of users. They can then analyze biometric data and deliver personalized insights on specific health factors. For example, Oura has developed algorithms to measure sleep stages and track women’s ovulation cycles, allowing users to monitor specific aspects of their health.
Oura Ring Features and Use Cases
The Oura Ring has received rave reviews for its lightweight design. The latest version is made of titanium and is just over 6 millimeters wide. It also integrates with hundreds of other health apps in addition to Oura’s, including Headspace, Strava and MyFitnessPal. Combine these traits with its built-in sensors and algorithms, and the Oura Ring becomes a useful tool for many health-related applications, including:
- Heart Health: Users can track their cardio capacity during exercise, heart rate and any changes in their heart rate. All these factors contribute to a “cardiovascular age” metric revealing how healthy a user’s heart is based on their age.
- Sleep Quality: A sleep score gives users a sense of how much time they spend in each sleep stage, how long it takes to fall asleep and any breathing issues that occur throughout the night, so they understand the quality of their sleep.
- Women’s Health: Women can use an Oura Ring to gather insights regarding their monthly ovulation cycles, as well as pregnancy and menopause. This way, they can gain a better sense of how their bodies respond at different stages of their lives.
- Activity Tracking: From house chores to intense exercise, an Oura Ring monitors a wearer’s daily activity levels via an “activity score.” Users can then gauge whether they’ve met their activity goals and whether lifestyle changes are needed.
- Stress Management: Oura uses heart rate variability, body temperature and sleep activity to determine when users are stressed and how long it takes to recover. Users can reference these insights to decide when it’s best to prioritize rest.
- Meal Planning: Users can measure their glucose and GLP-1 hormone levels to track their energy and gut health. The Oura app can also analyze images of meals and provide a nutritional assessment, so each user knows how their diet affects their body.
Signing up for Oura’s monthly subscription gives users access to even more features, particularly the company’s AI health assistant, Oura Advisor. This large language model is trained on extensive medical research and resources, enabling it to share data visualizations alongside its analysis and personalized, scientifically backed advice based on a user’s data.
Oura Ring 4 vs. 5
In 2026, Oura announced the Oura Ring 5, which displays some notable improvements over its predecessor. Here are some of the biggest changes between the Oura Ring 5 and the previous Oura Ring 4:
- Sizing: The Oura Ring 5 is 40 percent smaller than the Oura Ring 4, making it much lighter. That said, it comes with fewer sizing options this time around.
- Battery Life: The Oura Ring 5 has a slightly longer battery life, reaching up to nine days compared to the Oura Ring 4’s eight days. But size and usage levels can impact the Oura Ring 5’s battery life.
- Compatibility: The Oura Ring 4 only integrates with about 40 healthcare apps, compared to the Oura Ring 5’s 100 integrations and counting.
- Pricing: The Oura Ring 4 is the cheaper option, with models available for $349. Meanwhile, the Oura Ring 5 starts at $399 and goes up to $499.
At the same time, many familiar features remain untouched. Both generations of smart rings come with charging cases, sensor systems and connectivity capabilities, including Bluetooth Low Energy network access and automatic updates via Oura’s mobile app.
Limitations to Health-Tracking Products
While Oura highlights the potential benefits of wearable devices, compiling personal health data in general presents some major risks. For example, fellow smart ringmaker Ultrahuman confirmed a data breach occurred when hackers used malware to steal an employee’s credentials, exposing customers’ wellness data. Oura has taken steps to secure its users’ data, but cybersecurity threats will only continue to evolve in the age of AI.
Another unintended consequence of using Oura Rings is that some users can become “obsessive” about their health data, according to a Wall Street Journal interview with Oura CEO Tom Hale. It turns out that health data tracking can actually make users self-conscious about their health to the point that it causes paranoia and anxiety. Such an admission raises questions around whether Oura Rings are indeed beneficial for everyone’s mental health.
Frequently Asked Questions
What does the Oura Ring do?
Oura Rings use artificial intelligence algorithms and sensors to collect individual health data, analyze trends and deliver highly personalized guidance and insights. They track key metrics like heart rate, body temperature and sleep quality to create a comprehensive picture of users’ health. Users can then reference these findings to determine whether they need to rest more, exercise frequently, adjust their meal plans and take other steps to manage their health.
Does Oura Ring require a subscription?
A subscription isn’t required to use an Oura Ring, but its capabilities will be quite limited. Signing up for a monthly subscription gives users access to a range of features, including Oura’s AI-powered personal health assistant, Oura Advisor.
Is the Oura Ring waterproof?
It depends on the generation. The Oura Ring 5 is waterproof, while the Oura Ring 4 is described as “water resistant.” For those who want to be able to expose their ring to the elements for extended periods, the Oura Ring 5 may be a better choice.
What data can Oura Ring track?
Oura Rings gather data on more than 50 health metrics, including heart rate variability, breathing rate, body temperature and blood glucose levels. Tracking these factors enables the rings to share detailed insights into whether users get quality sleep, eat a balanced diet, exercise enough and practice other habits to maintain their overall health.
