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# Best Smart Ring: SLEEP 💤 – and what about OURA 3?
- URL: https://www.lordofthesmartrings.com/best-smart-ring-sleep-and-what-about-oura-3/
- Published: 2019-12-29T15:29:00.000Z
- Updated: 2025-03-07T15:37:38.000Z
- Description: How Did Oura 3 Perform in the Sleep Lab? Did it match the results of Oura 4? An Appendix to the Big Comparison!
- Author: LORDoftheSMARTRINGS

This article serves as an **appendix to the big smart ring comparison** and the **results from the sleep lab**.

[Best Smart Ring: SLEEP 💤Which smart ring measures sleep best? I spent a night in a sleep lab to compare the sleep tracking accuracy of the top models against the gold standard—polysomnography (PSG). How did Oura, Samsung, Ultrahuman, and others perform? The results might surprise you!![](https://storage.ghost.io/c/01/ca/01ca9f1d-13b0-43d5-a8fe-dac2f7d3dc2f/content/images/icon/favicon-7.ico)LordOfTheSmartRingsLORDoftheSMARTRINGS![](https://storage.ghost.io/c/01/ca/01ca9f1d-13b0-43d5-a8fe-dac2f7d3dc2f/content/images/thumbnail/best-smart-ring-for-sleep.png)](https://www.lordofthesmartrings.com/best-smart-ring-for-sleep/)

And since it took some time to process this topic, I started to doubt the results. There was no other choice but to **dive back into the Oura 3 data** and incorporate it into the final results.

But surprise, surprise—**my test account subscription for Oura 3 had expired**. Just as "no pain, no gain" applies, so does **"no Oura subscription, no data."**

Would you pay **around $5.99 USD** just to find out if **Oura 3 tracks as well as Oura 4**? 🤔

[👉 Lord of the Smart Rings – Support Portal](https://www.lordofthesmartrings.com/#/portal/support)

I won’t keep you in suspense—I **paid the $5.99 USD**. And I might end up paying even more because... **I still haven’t canceled the subscription.** 😅

The comparison of hypnograms from the perspective of the apps looks like this:

![](https://www.fitnesator.cz/content/images/2025/02/Oura-3-vs-Oura-4.png)

The results in the form of a hypnogram are as follows:

The complete set of confusion matrices looks like this:

The final graph of all devices looks like this:

We can therefore say that the results from **Oura 3** are at a **similar level** to those of **Oura 4**.