I’m still very much in the process of trialling the Oura Ring 4, and although we’re still very much in our honeymoon period, she might just be a keeper.
Every other person I know has used a fitness tracker at some point, be it the Whoop or Apple Watch, to supercharge their sleep, track their menstrual cycle or monitor their stress, but I could never quite get behind their bulky, unattractive appearance. So, when I learned of the Oura Ring, I was curious: How effective is it really at tracking so much of our bodily functions, and what life-altering insights could I really glean from its data?
The popular health monitor — the first model of which was launched all the way back in 2015 — is designed to ‘paint a truly holistic picture of your health’ by monitoring your sleep, activity, stress, heart health, and hormonal cycle 24/7, before providing personalised health insights via its mobile app. The fact that it happens to also be a sleek Lord-of-the-Rings-esque ring has converted a starry, style-sensitive crowd, including Kim Kardashian, Gwyneth Paltrow, Jennifer Aniston and Mark Zuckerberg.
And, thanks to the return of Black Friday, all titanium versions of the Oura Ring 4 have been discounted, some by as much as 33%. So, read on for everything you need to know about the wellness tracker, as well as my first impressions and answers to all those common FAQs.
STORY LAST UPDATED: Wednesday, 26th November 2025 at 9:35am.
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How I tested the Oura Ring 4 & why you can trust me:
As an editor, I am constantly bombarded by brands shouting about new products they want to advertise, but thankfully, I have a close-knit network of fellow industry professionals who advise me on what I should actually invest my time in. I’m also a natural sceptic when it comes to gadgets and do not take recommendations lightly.
The reason why I’ve decided to give the Oura Ring 4 a go is that my partner and I are currently trying to conceive, which requires monitoring not just my monthly cycle and fertile window, but also my overall health, from optimising sleep to ensuring my meals are balanced.
The latest update to Oura’s reproductive health feature set provides cycle insights for your estimated fertile days, chance of conception at that time, and detected day of ovulation by measuring your basal body temperature, so I became curious to find out more.
When reviewing any product — this includes new-in fashion, viral beauty and highly-acclaimed wellness gadgets — I consider them all against the following criteria:
Everything you need to know about the Oura Ring 4:
Arguably, the Oura Ring is one of the most sophisticated wellbeing monitors to date, measuring more than 20 biometrics that all directly impact how you feel, including heart rate variability (HRV), blood oxygen levels and temperature.
In its latest iteration, the ring’s features have expanded into new categories, including stress & resilience monitoring, women’s health, and heart health, is said to soon include metabolic health tracking. As mentioned earlier, cycle insights highlight which phase of the menstrual cycle you are in, providing clarity on factors like typical cycle length, cycle variability, and period length.
You can also log meals using photos or text, and the app will grade its nutritional value, and an in-built meditation tool allows you to take a pause for however long you like while the ring measures your heart rate, HRV and skin temperature.
Every day, the dashboard shows your unique biometrics and health goals, from your “readiness” score for how much energy you might have to tackle your tasks today to longer-term metrics like cardiovascular age, cardio capacity, stress resilience, and sleep trends.
For those concerned about accuracy, the finger actually provides the most accurate reading of your heart rate, blood oxygen levels and temperature. Plus, the brand’s ongoing testing has measured the device to have a 79% sleep tracking accuracy, compared to clinical polysomnography at 83%. Need a tad more convincing? It also reported a 98% heart rate variability accuracy when compared to ECG2. Wondering how exactly it measures those metrics, though? Through a quartet of monitors: