OURA Ring Review – #1 Sleep Tracker + Activity

OURA Ring Review

Oura Ring Review

This OURA Ring Review covers one of the very best contenders for ‘best consumer-athlete sleep tracker‘.

>> Updated: 14 Aug 2018


The NEW Oura Ring is available to order NOW with shipping in Sep/Oct 2018.Same features and app as described below just awesome new aesthetics. Oura are dealing with a backlog of orders and ARE actively shipping.

These are the discounted prices with the code ‘the5krunner10’ valid until 31 May2018, which give $50/50€ discount (ie approx 20%)

  • 299 USD / 314 €: Balance Silver, Balance Black, Heritage Silver, Heritage Black
  • 399 USD / 419 €: Balance Rose, Heritage Rose, Heritage Stealth
  • 999 USD / 1049 €: Balance Diamond.

Manufacturer Site: (link to: ouraring.com – get up to 25% discount on the NEW ring with the code the5krunner10)

oura ring review comparison specifications


OURA Ring claims to be a high-precision sleep tracker with accompanying analytics and an app that advises you on readiness. the5krunner OURA Ring Review goes into all the details you need to know, explained straightforwardly.

As a ‘ring’ it is highly portable, yet your use of it may be limited by your appreciation of its aesthetics.


Whilst it IS an activity tracker it is not a high precision sports tracker. If you are an athlete of some sorts, OURA will be perfectly fine for sleep analytics and steps/general activity but, when you are training intensely, an additional device is needed ie your usual sports watch.

Whilst it takes HRV-accuracy HR readings at night it does NOT do the same throughout the day.


If you are interested in accurate nightly HR readings and sleep analyses then “Yes” the product is certainly worth considering and maybe you want to learn some more from this review.

If you want a ring-based solution to your sporting endeavours then, as far as I know, no other such product exists. At least none with any degree of accuracy.

Let’s have a closer look.


It’s a pretty-enough box. You get the ring and a USB-based charging cradle. When it’s charging the cradle lights up.

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Manufacturer Site: (link to: ouraring.com – use the 10% discount code TFK10)


There is no escaping the fact that rings are predominantly seen as jewellery. To wear the OURA all day you simply have to like its looks.

Put that thought on hold for a minute. Perhaps you might instead be interested in a conveniently worn sleep tracker and you are not so interested in activity tracking. Maybe the OURA’s subjective beauty is irrelevant to you  that context and all you want is something easy to use at night? ie a ring!

I  personally don’t wear jewellery, like rings, but it is a nice enough design. I would describe the finish on the model I have as a metallic-haematite-grey colour. Quite nice.

It does seem to have some fashion-credibility. A female friend wore it to a gym class and generated quite a bit of positive interest.

However I am not so sure that male friends can carry it off so well. Here’s a shot from Ben Greenfield’s site. Maybe they carry it off, you decide!

Source: Ben Greenfield Fitness


It’s a fairly big device. But NOT crazily big. Here are some images comparing to the chest strap pods we all ‘love/loathe’ and also comparing to a man’s plain band/ring of the same finger size.

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On either a 5’9″/174cm male or female I would say it just about works for 247 looks. Maybe a smaller woman could make more of the fashion side of the device, maybe a larger guy would make the ring look smaller? Apologies for the comments on size and gender, I try to avoid such comments but it seemed appropriate here for once. I’m sure some 5’0″ guys with awesome fashion-sense could make it work aesthetically too. I’ll stop now before I dig a hole any deeper for my gender-neutral self 🙂

The precise sizes are not given by Oura. Probably because each ring would be a different size.


Here are the headline specs as I see them:

  • Battery – 3 days per charge and empty-to-full charge in an hour;
  • Ring Sizes – 6-13, in full sizes;
  • Weight – 15g/0.5oz;
  • Waterproof – 5ATM, 50m ie swim/showerproof and can be worn in a sauna;
  • Bluetooth SMART Class 2, low-powered and ONLY ON about 1% of the total worn time and it has an airplane mode (Bluetooth OFF);
  • Made from zirconium dioxide ceramic which is claimed to be highly scratch resistant.; and
  • Allergies: Nickel-free and medical grade materials used. Inner moulding claims to be 100% non-allergenic


OURA use standard ring sizes. But you will probably want to try one on first so OURA have a ring sizing kit that can be sent out before you purchase. These are replica OURA sizing-rings and you can wear them 247 for a day, or more, to ensure you get the right size and are comfortable with the shape.

Oura Ring Review


  • Arctic White – $299
  • Mirror Black – £299
  • Stealth Black – $499

Stealth Black is a MATT colourway. The one I have is the MIRROR BLACK.


The app is free

Full device compatibility is shown (here). Essentially it is iOS9 and Android 5 and later but it does work on other devices than those as being certified to be compatible.

More on the app later…


I’ve been using it for well over a month. It’s been great.

It’s a highly practical way to wear a device. Running, cycling, swimming, sleeping and classes are all fine. There were only two occasions where I regularly took the ring off:

  1. To charge it!; and
  2. When using hand-held weights and/or hand-held gym equipment.

Getting the OURA Ring to synchronise with the smartphone app was OK but did seem to work better when the ring was very close to the smartphone.

There was a firmware update via the app and the update process worked fine.

USABILITY SUMMARY: Excellent. Highly usable.


It is difficult to compare the data of sleep trackers.

OURA point out what and how they capture data and then make their claim on accuracy as detailed here:
  • “Senses the arteries in your finger, just like the hospital pulse oximeter;
  • “Captures 250 samples per second for a constant flow of reliable data;
  • “Detects blood volume pulse, body temperature and activity level with advanced sensors; and
  • “Determines sleep stages with precision comparable to clinical sleep labs.”



clicks to show full image

Normally I devote less time to the app side of things as that tends to change regularly as the app is updated and also because the app can vary across platform and also because I like to spend more time with the sports/fitness gadget in question. Clearly I’m running out of things to say about a ring. So app-time here we go!



The main view of the app is the ‘daily feed’. This gives you some key highlights from each of the main 3 sections; sleep, activity and readiness.

For the intended target market of ‘the general consumer interested in sleep tracking’ then this is an appropriate and sensible format. The existing wordy interface probably would encourage you to interact with the device on a more regular basis than a few tables of numbers.

As follows, I would make the same, criticism of OURA as I do of EMFIT: I’m just too busy. I only want to look at the app when it has something exceptional to tell me. So I’m looking for some kind of exception-based alerting system.

Such alerts COULD change my training behaviour that day. But I don’t want to waste 3 minutes each day looking at stats that confirm I had a good night’s sleep.

From the main FEED view you can click/tap through to more detail on the Sleep, Activity or Readiness tabs. Perhaps one of those sentences in the feed did arouse your interest to delve further. The Oura interface is very simple to use and if you do indeed want to delve deeper then the information you want really is a simple tap and a swipe away.




clicks to full image

The main SLEEP view starts with a trend of how much time you spend in each type of sleep; REM-, light- and deep-sleep. There are also days shown above where I either forgot to wear the device or the battery was too low.

The image on the right then shows how you can swipe down for quite a bit more detail about a selected night’s sleep. Here we get:

  • Measures of sleep class and duration;
  • Measures of sleep efficiency (awake vs. asleep & time-to-go-to-sleep);
  • Nightly progress and trend of resting HR; and a
  • Breakdown of the night into sleep phases.

This is all interesting stuff, for a while. As an athlete you might know that HRrest is a (flawed) measure of your recovery and perhaps too a measure of your absolute fitness (HRmin). You might also know that:

  • Deep sleep – is the time to repair your body;
  • REM/Dream sleep – is for learning and memory ie cognitive performance improvements; and
  • Light sleep – perhaps is for memory consolidation and preparation for other stages of sleep.

So all these classes are important. But, really, I’m not that interested. I just want to know if I slept properly and if I need to do something about it – and, ideally, WHAT I should do about it. So I actually prefer the approach of EMFIT in this one particular instance, shown below. Here EMFIT gives you a green box target for each sleep class and its pretty easy to see if you hit the target. In this example I got too much LIGHT SLEEP.

However putting sleep classes to one side I would say the breakdown of sleep information by the OURA app is generally very good. EMFIT gets WAY TOO DETAILED, WAY TOO QUICKLY – personally I love that, but I expect most people won’t. So OURA is pretty close to what I imagine it’s target audience are looking for ie some clever details, but not too many.


The previous images for SLEEP CLASSES have been specifically chosen. They are from the same night and yet OURA and EMFIT differ very noticeably. I don’t really know which one is right. Here is the SLEEP CLASS comparison information again:

  • REM: EMFIT 21%, OURA 54%
  • Light: EMFIT 63%, OURA 34%
  • Deep: EMFIT 16%, OURA 8%

I could spend a considerable period of time analysing the differences but there is no point as they clearly account for sleep classes in a different way.

Whilst the determination of the start and end of a sleep class is not based on HR, I found the disparity in sleep classes quite surprising as, for example, some other data like the Heart Rate track for each system seemed VISUALLY SIMILAR.

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I should also point out that OURA say that they try to emulate PSG (polysomnography) readings and claim that they have got closer to that standard than any other product. Apparently most researchers in ‘sleep tracking’ world take PSG as the gold standard.

This SLEEP CLASS comparison by SleepLAB of OURA to PSG could be seen as a reasonable match.

Source: Image clicks through to original source



click for detail

Each morning the OURA ring gives you a ‘readiness’ score out of 100 with 100 being the best.

I could nitpick here and say that a simple traffic light (Red-Amber-Green) would be better but dealing with a percentage is easy enough for most people.

HRV-based, training-readiness apps that use chest straps, like BioforceHRV and Elite HRV, also provide a readiness score. Having used such products for many years I can say that a simple, daily indicator is a very useful piece of advice. Whether or not such an indicator is accurate is another matter entirely.

OURA is also great as it allows you to view some of the components of your readiness score including:

  • Sleep Balance
  • Previous Day Activity
  • Activity Balance
  • Body Temperature
  • Resting Heart Rate
  • Recovery Index

But really, as I said before, I really only want to know if: I am ready to train; or not ready to train; or ‘maybe’ ready to train.


Just like the assessment of sleep quality, it is impossible for me to say if OURA is ‘right’ or ‘wrong’ when it comes to the accuracy of its readiness readings.

My feeling is that OURA broadly matches how I feel and broadly matches Bioforce HRV in its general guidance.

But then if a readiness product matches your ‘feeling’ is that actually useful? Surely you could trust your feeling?!?

For my athletic endeavours I NEVER trusted a single product to tell me if I was ready for strenuous exercise on any one particular day. Instead, for example, I would look at BioforceHRV alongside a statistical measure of my Training Stress Balance and against what my Garmin told me as I warmed up for an exercise. I would then make my own call based on this information.

OURA could quite easily replace a product like BioforceHRV/EliteHRV/ithlete on that basis. Also because Bioforce & co are based on a 1-3 minute snapshots then that could lead to errors whereas OURA is working away all night!

However some of the real usefulness of READINESS guidance comes when you are approaching an OVERTRAINED state. This is where your training can go quite wrong, quite quickly. And at such a point your feeling MIGHT not tie in with the reality of impending physiological doom. Or, put another way, a readiness product should specifically be able to detect when you are approaching an overtrained state. I didn’t get to that point with my use of OURA so I can’t really comment.


Click to enlarge


The activity view is nice and clear. It gives a pretty simple and, to me, good insight into differing levels of intensity and durations – trended hourly and daily.

People are starting to realise that it is not just ‘steps’ or ‘activity’ that are important but it is the INTENSITY of the ‘step’ or activity that is probably more important. So OURA’s inclusion of their take on ‘intensity’ is very sensible.

A cursory comparison of steps against a Polar tracker showed some notable differences. I tend not to worry about these things too much. If you stick with one device and don’t obsess over the 10,000 daily steps mantra you will get a good view of your non-sporting activity levels and whether or not you are improving.

So OURA is probably not the best activity tracker but it’s good enough for tracking your general level of non-sports activity.

You won’t be able to use OURA to meaningfully track SPORTING levels of activity. But that’s the great thing with a ring….it very nicely complements a typically ugly-but-useful sports watch.



Oura are continuing to significantly invest in the development of the ring. Always a good sign.

2017 has seen the rollout of the CLOUD view of your data. You still sync to the app as normal but the app now copies that to your online account.

Currently the CLOUD view shows either a daily/weekly/monthly trend (above) or the dashboard view (below) which has many similarities to the app. It’s just sometimes a bit easier to look at a larger computer screen.


The trends are sometimes good to look at as from one day to the next you can see  reading that looks ‘about right’ but you might not spot the gradual decline that looking over several weeks would facilitate.


For me the nature of the OURA product make it a great fit with an athlete’s lifestyle. You can easily take it with you wherever you go and you can easily wear it overnight and, optionally, throughout the day even when training alongside another device (sports watch).

Of specific interest to me were:

  • Deep Sleep Statistics – possibly ensuring adaptation to exercise is happening
  • Night time temperature – a check against a good/high HRV being caused by illness
  • General sleep quality
  • General low level activity tracking


In “The Sleep of the Ring: Comparison of the ŌURA Sleep Tracker Against Polysomnographyde Zambotti et al (March, 2017) conclude “…From EBE analysis, ŌURA ring had a 96% sensitivity to detect sleep, and agreement of 65%, 51%, and 61%, in detecting “light sleep” (N1), “deep sleep” (N2 + N3), and REM sleep, respectively. Specificity in detecting wake was 48%. Similarly to PSG-N3 (p < .001), “deep sleep” detected with the ŌURA ring was negatively correlated with advancing age (p = .001). ŌURA ring correctly categorized 90.9%, 81.3%, and 92.9% into PSG-defined TST ranges of < 6 hr, 6–7 hr, > 7 hr, respectively. Conclusions: Multisensor sleep trackers, such as the ŌURA ring have the potential for detecting outcomes beyond binary sleep–wake using sources of information in addition to motion….”

de Zambotti et al (2017)

Apparently that study is peer-reviewed.

With my non-science eyes that (excerpted) conclusion & diagram looks ‘good’.

Any scientists reading might also consider this research from 2000 (ie PRE-OURA): Norman et. al https://www.researchgate.net/publication/12243393_Interobserver_Agreement_Among_Sleep_Scorers_From_Different_Centers_in_a_Large_Dataset which expects variation in the interpretation of results.


I would consider the products shown below to be ‘proper’ alternatives. An average Jawbone, Apple Watch, Fitbit or Garmin band are not quite in the same league as OURA for sleep tracking…despite what they might claim.

QS EMFIT (review) – Extensive and detailed nightly sleep stats and trends from an under-the-mattress sensor.

EMFIT QS - HRV Enabled Recovery, Stress & Sleep Quality Monitor

WHOOP (review) – Wrist bracelet for nightly sleep stats, daily exercise stats coupled with readiness & recovery

whoop review




  1. If you want to improve your sleep then give some thought to what lifestyle choices are AFFECTING your sleep. So if you have coffee late at night, or alcohol, or engage in sexual activity, or play computer games then you are not really determining which of these is LIMITING your current sleep effectiveness.
  2. OURA does not have sports-specific metrics and does not auto-detect and label specific activity types. It looks at activity ‘in the round’.
  3. OURA tracks activity whilst swimming but does NOT track HR whilst swimming
  4. OURA does not show ‘live’ HR data but does record HRV levels of HR accuracy overnight.
  5. During the day OURA only measures ‘activity’ through movement, not HR
  6. Daily activity targets are set each day based, for example, on previous night’s sleep quality
  7. There is only limited data export eg to www.wearecurio.us
  8. As of 28April2017 – new HRV features have been announced for May 2017.



I like both the concept and the execution of the OURA ring. A ring-based HRV/sleep readiness tracker ‘makes sense’.

The aesthetics of the ring are liked by most people I showed it to – male and female alike

The ring fits, it charges, it connects to the app and it works well.

The app could be extended in many ways but it delivers key information in a succinct and easy-to-use manner.

If anyone could make a similarly wearable device that also captured accurate heart rate data during exercise they would probably be rich soon after! No-one can do that (ever…probably)

The stats all seem great, with the activity tracking during the day certainly being plausible. I would tentatively conclude that the OURA seems equally as accurate as the QS EMFIT for sleep and readiness tracking – both are probably contenders for

…the ‘golden standard’ of sleep tracking when applied to consumer products.

I’m not quite sure what I would change about the Oura Ring, even if I were given a magic wand. Changing the looks to suit me may well not suit you. Making it smaller may well reduce battery life. Perhaps a battery low alert could be added to the ring. But that’s a pretty trivial request for improvement.

I would really like 2 or 3 genuinely independent sources of verification about OURA’s accuracy. Then again, I think I would like that SAME LEVEL OF RESEARCH FOR ALL SLEEP TRACKERS that claim a high level of accuracy. OURA seems to offer very good data for sleep & recovery analysis.



Manufacturer Site: (link to: ouraring.com – get up to 25% discount on the NEW ring with the code the5krunner10)

oura ring review comparison specifications


There might still be some of the old style ones left…


Click to buy – don’t forget to use the discount code

  • Arctic White – $299
  • Mirror Black – £299
  • Stealth Black – $499

Stealth Black is a MATT colourway. The one in this review is the MIRROR BLACK.

Manufacturer Site: (link to: ouraring.com – use the 10% discount code TFK10)

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Christiine Rose
Christiine Rose

I have an OURA and I’m really loving it. My impressions are somewhat different than yours I think.
The activity tracker is a disappointment. I log my gym workouts, and it tells me I’ve met my goal–in other words, it’s not capable of tracking a gym workout.. It does realize when I’m walking, but I have foot problems and avoid walking.
I have not found the readiness indicator to be an indicator of my actual physical condition, unless, as you say, it has insights beyond what I can feel.
Finally, I have the smallest size. I’m a medium sized woman. The average woman’s ring size is between 6 and 7. You go into the aesthetics of the ring from a man’s POV but I thought it worth pointing out that a lot of women won’t even have the option of an OURA.

Joshua Finlay
Joshua Finlay

I would caution anyone considering purchasing an Oura ring that I have had a negative experience with the company.

After waiting 6 months for the ring, I got fed up with the delays and cancelled my order. This was on June 17th. I have been constantly emailing the oura team (both Jonna and Anna) asking for a refund. Despite continued promises, I have not received this refund. I am on the brink of reporting the company to trading standards. I will update this comment if the situation changes.