Oura Ring vs NextSense Smartbuds: Track Your Sleep, or Improve It?
Reviewed by the NextSense sleep science team
They sound like rivals. They're really two different tools for two different jobs — and knowing which job you want decides which one belongs on your body tonight.
The short answer: the Oura Ring is one of the best sleep trackers ever made. NextSense Smartbuds aren't a tracker at all — they're a sleep improver. One tells you how you slept. The other works, in real time, to help you sleep better.
What the Oura Ring does well
Credit where it's due: Oura is excellent. The Gen 4 ring is light, comfortable enough to forget you're wearing it, and lasts up to eight days on a charge. From your finger it tracks heart rate, heart-rate variability, body temperature, movement, and blood oxygen, then turns them into a polished Sleep Score and Readiness Score each morning. As an all-day health and recovery companion, it's superb.
The two things it can't do
1. It infers your sleep; it doesn't read your brain. Sleep stages are defined by brain activity — that's why sleep labs use EEG. A ring estimates your stages from the downstream signals it can reach at the finger: pulse, temperature, motion. Good estimation, but estimation.
2. It only measures. This is the bigger one. The Oura Ring will tell you, faithfully, that your deep sleep was low again. It cannot do anything about it. And most of its insights sit behind a membership (about $5.99/month) on top of the ring's price.
What Smartbuds do differently
NextSense Smartbuds put clinical-grade EEG sensors in your ears — reading your brain's electrical rhythm directly, the same signal a sleep lab reads. Then they close the loop: when they detect deep sleep, they deliver sound timed to deepen it. They don't just score the night; they shape it. And it's a one-time purchase — no subscription to keep your own data.
| Oura Ring 4 | NextSense Smartbuds | |
|---|---|---|
| Worn on | Finger | In-ear |
| Sleep signal | Heart rate, temp, motion (inferred) | EEG — direct brain activity |
| Improves your sleep? | No — measures only | Yes — closed-loop audio |
| All-day health metrics | Yes (strong) | Sleep-focused |
| Subscription | Required for insights (~$5.99/mo) | None — one-time purchase |
Could you use both?
Honestly, yes — and many people will. Wear the ring for daytime recovery trends; wear Smartbuds to actually improve the night. They answer different questions. (The Wize Sleep app even brings data from both into one place.)
Which should you buy?
If what you want is to know your sleep and track all-day health, the Oura Ring is a great choice. If what you want is to change your sleep — to get more deep sleep, not just a number telling you it was low — that's the one thing a ring can't do, and exactly what Smartbuds are built for.