The Oura Ring is a smart ring that helps you learn about your body by tracking your sleep, activity, and other important health signals.

Key idea: Oura Health has received a lot of money from investors and bought other companies to help it grow and improve its products.

To grow and make even better rings, Oura Health needed money, just like a plant needs water to grow. They got their first big help in 2015, raising about $2.3 million from investors. This is called 'seed funding' because it's like planting the first seeds for the company.

Later, in 2021, they got a huge amount of money, $100 million! This helped them do even more cool things. By 2024, the company was worth about $5.2 billion, which is a giant number! They also bought other companies, like Proxy Inc. in 2023, which makes tools for digital IDs. They also bought Sparta Science and Veri in 2024 to learn even more about health. All this money and growth means they can keep making their rings smarter and more helpful.

"All this money and growth means they can keep making their rings smarter and more helpful."

“All this money and growth means they can keep making their rings smarter and more helpful.”

Key idea: The Oura Ring is a comfortable, smart ring that uses special lights and sensors to track many health details and sends them to your phone.

The main thing Oura Health makes is the Oura Ring. It's a small ring you wear on your finger, but it's super smart! It collects lots of information about your health, just like a fitness tracker you might wear on your wrist. It checks things like your heart rate, how much you move, your body temperature, how fast you breathe, and how well you sleep.

All this information is sent wirelessly using Bluetooth to a special app on your smartphone. The ring uses tiny lights called infrared LEDs to see what's happening inside your finger. It shines light through your skin, and then a special computer program (called an algorithm) figures out your heart rate and other details. The Oura Ring 4, for example, has special sensors built right into the ring, so there are no bumps inside. It can even tell you about your period!

The ring is designed to be comfy, so it doesn't bother you when you sleep or play. It's also pretty light, weighing only about 4 to 6 grams, which is less than a stack of five paper clips. And its battery can last for a whole week on just one charge! The newest ring, the Oura Ring 5, is even thinner and better at tracking things, and can even help track special medicine.

Key idea: Oura Health works with other companies, from fashion brands to the military, to expand its reach and offer more health insights.

Oura Health also works with other cool companies to make its rings even better or to reach more people. For example, in 2022, they teamed up with the fancy fashion brand Gucci to make a special Oura Ring with gold details. In 2023, they worked with a gym company called Equinox to create a 'Rest & Recovery Kit' that included the Oura Ring.

They even help the U.S. military! In 2024, Oura made a big deal worth $96 million to give smart rings to soldiers. This helps the military keep an eye on their health and tiredness. Oura also partnered with Dexcom, a company that tracks blood sugar, so their products can work together and give people even more information about their bodies.

“They even help the U.S. military!”

Key idea: The Oura Ring has been praised for its innovation and used by celebrities, but some older versions had accuracy issues.

People have said many good things about Oura Health, especially how new and clever their ideas are. Time magazine even called the Oura Ring one of the '100 Best Inventions of 2020'! This was partly because NBA basketball players used it to help stay healthy during the COVID-19 pandemic.

Lots of famous people, like Jennifer Aniston and Prince Harry, also wear the Oura Ring. They often talk about how it helps them understand their sleep. However, some people have also pointed out things that could be better, like how accurate the older rings were for tracking sleep or how well they measure heart rate during tough exercise.

Key idea: Oura has faced challenges, including reports of rings overheating, a new monthly fee that upset some users, and privacy concerns about data sharing.

Sometimes, even cool new things can have problems. In 2025, some people on the internet said their Oura Rings got too hot, or even looked a little melted! Oura Health said these were 'extremely rare' cases and that their own checks didn't find a big safety problem.

Another thing that made some people unhappy was when Oura started charging a monthly fee for some features after the third-generation ring came out. People felt it was too much to pay for the ring and then pay extra every month. Also, a writer named Adam Clark Estes found that using too many health trackers, including the Oura Ring, made him feel more worried instead of better. He said it's important not to look at the data too much.

Finally, in 2025, Oura got into trouble when its CEO said they would share some data with a company called Palantir, which works with security. This made many users worried about their private health information. Oura later said they would only share data from military customers in separate systems, but some people were still upset and stopped wearing their rings.