Amazon knocks $100 off the Oura Ring 4, 'the most accurate sleep tracker we've tested', in early Prime Day deal
Save 20% on the Oura Ring sleep tracker in Amazon's early Prime Day sale
From monitoring your rest to optimizing your sleep, trackers have many benefits — but they aren't always accurate and some are just plain uncomfortable. However, the Oura Ring 4, down to $399.99 (was $499.99) at Amazon, fits like a glove and delivers some of the most accurate data of all the sleep trackers we've tested.
The glowing feedback from lead tester, Eve Davies, ensured we bumped this stylish smart ring to the top of our best sleep tracker guide. She said it presents data in "a clear, user-friendly format" and how the accompanying app provides actionable tips for improving your sleep.
I was surprised to see the Oura Ring 4 on sale at Amazon, as I predicted it wouldn't be discounted until next week's Amazon Prime Day sales. I've just received mine and I can't wait to start using it. Here's a closer look at the deal, and if you want to upgrade other aspects of your sleep, check out ur guide to the best Amazon Prime Day mattress deals ahead of this year's 4th of July mattress sales...
You can currently save $100 on all ring sizes of the Oura Ring 4 at Amazon, for up to 20% off. You will need to pay a monthly subscription fee of $5.99 to access all the features Oura has to offer, but the first month of membership is completely free (and subscriptions are common in sleep trackers.) If you haven't bought one before, make sure to pick up an Oura Ring Sizing Kit, now 15% off at Amazon, fast as the sizing kit tells you which Oura Ring 4 size you'll need to order.
Our Oura Ring 4 review: ★★★★★
User score: ★★★★ (7,900+ reviews)
Accurate data to optimize your sleep
The Oura Ring 4 stands out due to its advanced technology, which adapts to your finger to maintain consistent skin contact, capturing highly accurate data on everything from heart rate variability to specific sleep stages.
To help users understand their rest, the companion app summarizes complex data into user-friendly daily Sleep and Readiness scores. It also pairs these metrics with actionable sleep advice.
While the price and required monthly subscription fee may not fit every budget (even in the sale), its comprehensive performance justifies the investment for anyone who wants to optimize their sleep.
The device provides up to six nights of battery life on a single charge and delivers reliable, scientifically grounded insights that mirror professional polysomnography testing.
Smaller budget? Try this...
The Garmin Index Sleep Monitor is a sleep tracker in the form of an armband, which our testers highlighted as being super comfortable. Our Garmin Index Sleep Monitor review also praised the Sleep Monitor for its accurate sleep metrics —no sizing kit required, the Garmin Index Sleep Monitor is $30 off, dropping to just $139.99.
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Frances Daniels is a PPA-accredited journalist and Sleep Staff Writer at Tom's Guide with an MA in Magazine Journalism from Cardiff University. Her role includes covering mattress and sleep news and writing sleep product reviews and buyer's guides, including our Best Hybrid Mattress 2025 guide. She is interested in the relationship between sleep and health, interviewing an array of experts to create in-depth articles about topics such as nutrition, sleep disorders, sleep hygiene, and mattress care. She is also our specialist on mattress toppers — producing bed topper reviews and taking care of our Best Mattress Toppers 2025 guide — and leads content relating to fiberglass-free beds for a non-toxic sleep. Outside of Tom's Guide, she has written for Ideal Home and Marie Claire.
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