The Oura Ring 3 crashes to its lowest price with this massive Prime Day deal

Oura Ring Gen 3 in silver in between a user's fingers — (Image credit: Future)

Oura officially announced the Oura Ring 4 last week. The brand's new smart ring has better battery life, improved accuracy and new designs, but the most exciting new features will also be available to Oura Ring 3 wearers.

If you've been thinking about picking up one of the best smart rings, now is the best time, as the Oura Ring 3 is reduced by up to $100 right now at Amazon with this Prime Day Oura Ring deal.

Oura has discontinued this third-generation ring, so once retailers run out of stock, it'll be gone for good. Plus, the Oura Ring 4 won't be available in the flat-topped Heritage design, so this is your last chance to pick up that model.

The discount varies between Horizon and Heritage, and by color, but you can save up to $100 depending on your preferred configuration.

The reason Oura's latest features will make their way to the older ring is thanks to a redesigned smartphone app, with tabs to make it easier to spot short and long-term trends and three new features; Automatic Activity Detection, Fertility Insights and Daytime Stress.

So, whether you have the Ring 3 or Ring 4, as long as you pay the $5.99/month subscription, you'll be able to access all these insights. The main difference between the two rings is that the sensors have improved accuracy on the Ring 4.

But the Oura Ring 3 is still definitely worth the money. The overall experience is miles ahead of the competition (except possibly the Samsung Galaxy Ring), and Oura validates the accuracy of its rings with research studies.

Plus, our experience with the ring bears that out. Oura was able to spot our fitness editor was pregnant before she did, and the ring helped one of our team detect potential sleep apnea with breathing disturbances throughout the night.

However, we found that the quoted seven-day battery life on the Ring 3 was more like five in practice. So hopefully there'll be a bit of a boost with the Ring 4's eight-day battery life. And the sensors on the newer model are now recessed in the ring.

And if you do want to pick up the latest model, Oura didn't actually increase the price for the Ring 4. The all-circular ring starts at $349, just like the circular Oura Ring 3 Horizon edition.

James is Tom's Guide's Buying Guide Editor, overseeing the site's buying advice. He was previously Fitness Editor, covering strength training workouts, cardio exercise, and accessible ways to improve your health and wellbeing.

His first job at as a sales assistant in a department store, and this is where James learned how important it is to help people make purchasing decisions that are right for their needs, whether that's a fountain pen to give as a gift or a new fridge for their kitchen.

James is an advocate for sustainability and reparability, and focuses his reviews and advice through that lens to offer objective insights as to whether a specific product or service will be right for your needs.