Apple Watch Series 9 & Ultra 2: SCIENTIFIC Review

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Timestamps:
00:00 Testing Background
02:02 Short Unboxing : Ultra 2 + Series 9 45mm + Series 9 41mm
03:15 Indoor Cycling Test 1 : Female
07:06 Running Test 1 : Female
08:39 Weight Lifting Test 1 : Female
10:56 Indoor Cycling Test 1 : Male
13:47 Outdoor Cycling Test 2 : Male
18:38 Running Test 2 : Male
20:25 Weight Lifting Test 2 : Male
24:09 GPS Test
30:35 Oxygen Saturation Test
32:12 Conclusions
Reference devices
Polar H10 : pubmed.ncbi.nlm.nih.gov/31004...
In this video, we'll be conducting an initial set of systematic tests on two new models of Apple Watches, the Apple Watch Ultra 2 and the Apple Watch Series 9. The aim is to evaluate the heart rate measurement performance, oxygen saturation measurements, and the GPS tracking accuracy of these watches. For the heart rate measurements, we’ll do these tests on both myself and Theresa, in various exercise settings such as indoor and outdoor cycling, running, and weight lifting. Our aim is to determine whether these new models have improved functionalities over their predecessors, and the standardized nature of these tests will provide you with an initial credible basis for comparison. So, without further ado, let’s get started.
Hello everyone, for those of you that are new to the channel, my name is Rob, and I am a postdoctoral scientist specializing in biological data analysis. In this video we will be doing a first set of tests on the Apple Watch Ultra 2 and Apple Watch Series 9. Now, today's video differs slightly from our usual format. Instead of performing all tests first then shooting the video, I'll be picking up my newly released Apple Watches today, performing the tests, analyzing the results, and sharing them with you as I am doing them. Additionally, this testing process isn't limited to myself, Theresa here will also help out. I've purchased two Apple Watch Series 9's; a 41mm version for Theresa and a 45mm version for myself. Additionally, I've ordered an Apple Watch Ultra 2, which I'll mostly test on myself, but I'll also use it for some of Theresa's tests. To start, we'll focus on the heart rate performance. But first, I need to pick up the watches from the Apple store, so let's head out!

[@qwertimus]

It's insane how reliable the Apple Watches are in the smart watch segment

[@anthonycraig274]

I remember testing the very first Apple Watch and even that was extremely accurate.

[@shoaibaalam8978]

But only with one day battery life 😓😓😓

[@humanchannel9421]

They bought all of the companies with the leading sensor patents a few years ago. The only way to match them is to ignore the patents (Huawei) or create workarounds.

[@anthonycraig274]

@@humanchannel9421 Apple Watch is 9 years old, and the sensor on their watch back in 2014 was brilliant for its time, to the point I stopped using my polar except for boxing.

[@perfectlyaware2953]

@@shoaibaalam8978 I wouldn’t want my watch to be on my arm more than 12 hours max. I need to rest my skin.

[@odzacargrla]

as a young biologist with aspiration to become a biological data scientist, you are a great inspiration. keep making amazing videos!!

[@TheQuantifiedScientist]

Thanks so much!

[@VRayDantesTrygorn]

I've got some ideas for your videos: 1) A comparison of cheap and expensive chest straps for HR and HRV. 2) A comparison of apps to measure heart rate through the phone camera (Google Fit does it, Welltory claims to measure heart rate variability too). See if they are reliable. 3) Suggestions and ideas on how to use data from these devices to improve our daily life. I'd love to hear your perspective on this and what do you use them for. Do they help you exercise better? Sleep better? What's the best use of these devices? I have a smartband that tracks me but I'm not sure of what do to actively do with the data. It tells me how I slept or exercised but it doesn't necessarily help me to do better. What do you think?

[@TheQuantifiedScientist]

Thanks so much, I especially like suggestion 3. This is something I still want to do, but need to think about carefully

[@marceloarnez1491]

The accuracy of this product astounds me. Picked one up thanks to this video. Thank you.

[@yw5fb]

I like this new format: male and female tests 👍 thanks for these tests. Apple watches destroys literally any competition🎉

[@bigmaxcc]

Destroys any completion 😂yet the battery life won’t last a week. The day Apple makes that happen I believe it, 18hrs usage even with low power mode 60hrs like what 3 days than charging back to full Even on a Triathlon depending how long the route you be lucky it lasts

[@Ibrahims14]

This is the only video you need to watch to know what is the best watch in the market.. thank you so much for this great review

[@kornelhoekerd3166]

Hi Rob, great review as always! Something I structurally miss in your reviews is SpO2 measurements during sleep. For people with sleep apnea and related issues this is a very important feature. For instance my Garmin Forerunner 745 does a pretty decent job here. Something to consider for future reviews or maybe a good subject on it's own.

[@anthonycraig274]

Happy you have another data set :-) Teresa, you are a welcome addition.

[@TheQuantifiedScientist]

Yes, really nice to include more data :-)

[@endermusica]

You look like you're both so nice, good people. It's always great to watch this for the scientific content, but the good vibes add a lot.

[@JohnSmith-el4ez]

I wish we live in a world where eco-systems are integrated into each other. I want to use an Android phone with the Apple watch.

[@KelpieMindTricks]

Yes. Please.

[@ericy1005]

Apple watch on Android would be perfect.

[@OMGitsBababoey]

When you can, please do a review on the Garmin Venue 3! As always great review!

[@NostalgicMem0ries]

my most waiting smartwatch, but im scared it will do same as older venu 2 plus below average accuracy ;\

[@OMGitsBababoey]

@@NostalgicMem0ries ya, really hope the accuracy is better than my venue 2

[@coolerhz]

I am waiting for the review too~~

[@TheQuantifiedScientist]

Coming soon! Unfortunately Garmin has not sent me devices before release (so far), so I am later than other reviewers

[@djElectroFist]

​@TheRussianLobster by the chart here it's over 97 percent accurate and you take those random spikes away and it's pretty dead on. Nobody is going to look at their watch at 120bpn, see it instantly go to 160, and down to 120 again and believe that it actually did it. A few bpm off won't kill you. People get too hung up on stats. It's a great watch.

[@stigz3570]

Incredible work. Incredible channel. Well done and thank you as always! 🙏

[@nicholasrutherford2871]

I love your content Rob. You have one of the best channels on KZbin. Keep it up!!!!!

[@TheQuantifiedScientist]

Thanks so much!

[@nl3712]

Agreed

[@rodrigomsiqueira]

Hey Rob, a great challenge that I've been experiencing and that would make an excellent video is the distance measurement made in open water swimming. I'm a sea swimmer and in my training group I'm the only one with an Apple Watch Ultra, so our distances always differ by more than 1000 meters. There was a training session few weeks ago where we did the exact same route and the difference in measurement was 800 meters (for swimming, that's quite a lot). I saved this training data and maps and took them to an Apple Store, they gave me a new device, and the difference decreased but continues long. Garmin seems to be the most accurate in this scenario. I don't know if it would be possible to do this test, but I think it would be excellent content.

[@TheCodeda]

Thank you so much for this video! I have been considering an apple watch ultra even though I'm a woman with small arms. I've been wondering how accuracy and this was super helpful.

[@Orion5]

Thank you for the quality of your video. Very detailed test ! 😊

[@TheQuantifiedScientist]

Glad you liked it!

[@nl3712]

Fantastically useful and accurate review. One thing most reviews miss is that apple OS is soooo good, especially when compared to Garmin (i am a garmin edge user for 10+ years, as a cyclist; and i previously owned a fenix)

[@jessebijl553]

Most useful smartwatch reviews on youtube👌

[@TCPUDPATM]

YES! Been waiting for your review! 🤟🏽

[@b.4081]

Awesome review again Rob! I really like the male vs. female comparison. The Watch 9 is going to contend with the Garmin Venu 3 so I'll await a review for the latter. ;)

[@fist003]

dang the best got better. Great work as usual Rob

[@marijnvp1]

Thanks for the review! I'd also like to see a Venu 3 review from you with the new sleepcoach functionality :)

[@cookedghost]

Thank you so much for testing on Theresa! As someone with relatively small wrists who wants to get the Ultra it’s great to see that it still performs as well as the other models

[@TheQuantifiedScientist]

Glad it was helpful!😊

[@patria1283]

Love your channel as always I just got my new Apple Watch 9. Upgrade from series 3

[@ivan_kovachev]

You are just awesome

[@melitabogor543]

Great! Please 🙏🏽 do a accuracy test for Vo2max and HRV

[@robertjleter]

Great to have the two Titans of smartwatches just after each other and brand new. Please do a comparison test on VO2max and HRV, as far a I know the best predictors of longevity measurable on a smartwatch.

[@Alvin.Prather]

Great review, thanks for sharing!

[@TheQuantifiedScientist]

Thanks for watching!

[@yildiraykomurcu]

Will you test RingConn, Ultrahuman ring, Circular ring, Iris ring, all which are competitors of Oura ring? I would also recommend testing other health metrics like ECG, blood pressure, body composition, temperature, etc, if it is available on the device. GPS test is less important. Thanks for the review.

[@TheQuantifiedScientist]

Thanks for the suggestions. I do have an Ultrahuman ring

[@KelpieMindTricks]

I like that you are adding more testers to the pool. Soon we will have data from a legion of people. You should try and organize a testing cohort who follows the same protocols.

[@TheQuantifiedScientist]

Working on it 😊

[@KelpieMindTricks]

@@TheQuantifiedScientist My man

[@timmyjag]

Looking forward to the sleep tracking analysis of these watches and the Garmin Venu 3!

[@mymatemonkey]

Hey, great video as always. I have a question: Garmin released the new Venu 3, could you test it? I'm thinking about buying it (for hiking), as it seems to be a great fitness watch, but I'm uncertain since it doesn't use multi band GPS.

[@danieljrgensen133]

Awesome work Rob, you rock!! 👍 Quick questions: 1. What firmware was used in these first initial tests? Latest v10.0.1 firmware? 2. Do you plan on re-visiting(re-test) any of the older models, like the 2022 SE model, now that they have a new OS firmware update released? I'm particularly interested to see if sleep stage detection and heartrate detection has been improved with latest v10 firmware updates! 😉

[@whitefish2160]

From my very unscientific tests, GPS accuracy seems to be more accurate in OS10.

[@TheQuantifiedScientist]

Thanks! 1. Yes, latest v10.0.1 firmware 2. Yes, the "UltraGen1" was tested with the 10.0 and 10.0Beta

[@danieljrgensen133]

@@TheQuantifiedScientist Btw. Rob, you can save time and money on airplane flights, if you instead do the spo2 tests at night when you sleep. Spo2 levels should follow the heartbeat rate and breaths. So, any inaccuracies in the test device should be equally well exposed(compared to flight sessions ) in this "test environment" as well. But is "free" to do! And seeing as most people will probably use Spo2 readings to primarily track their sleep quality anyway, you get a more "usefull" test parameter in your review this way....in my humble opinion, of course! 😉 Ps: Thanks for the clarification of what firmware was installed in the Apple watches! 👍

[@demisdiaconescu]

Thank you very much for these videos 🙏. Do you have a similar review for the Withings Scanwatch 2?

[@SamanBahrampoor]

Hello, Any chance you would test the new Withings ScanWatch 2 next? :) I really appreciate your detailed and scientific reviews. Great job, really :)

[@Sylonce]

Nice data comparison! Could use activity and subject observed next to graphs but very interesting!

You got the watches with the new strap (sport loop) do you think the infinetely adjustable strap makes the HR readings more accurate than with a sport band strap?

[@MusabTahaTarik]

What a quick review is this 😮

[@TheQuantifiedScientist]

Thanks! It was a lot of work

[@KeithCole]

What software did you use to map the multiple routes? I’d love to see how the watches perform in my area. I’m wondering if some of the variances are due to initial firmware that has been updated now or due to buildings, etc.

[@mattmcmullen8244]

DCrainmaker also found more inaccuracy than expected in the Ultra 2 in a city, despite the fact that the Ultra 2 should be better because of the dual GPS. It looks like something funny is going on with it.

[@chasingdreamsmediareviewzt124]

I genuinely appreciate your work. I have heart arrhythmia, and I use an Apple Watch Ultra Gen1 when I work out. I was contemplating getting a Gen 2. Which one do you recommend? Gen 1 or Gen 2 ultra? (For weight lifting) I also have a Galaxy Watch 6 Classic, but the Apple watch smokes the Samsung. And again, thank you for your work. Your channel is the only channel I go to for smartwatch heart rate tracking

[@HarshitRajIITB]

Hey, can you please keep doing the running tests. It helps a lot as it is more common than cycling! Also would be great if you could test the Garmin HRM Dual chest strap against the Polar H10.

[@stmcm]

I like your videos and am a regular viewer , but I would like to raise a critical thought: If you say, that "more testing is definately needed" - that raises the question whether you focused on uploading the video as fast as possible, on the cost of being as accurate as possible. I find it difficult, precisely because your approach is to create scientific reviews. I know its really important to produce content as close as possible to the release date of the hardware, but please dont lower your standards. I really enjoy your channel very much!

[@TheQuantifiedScientist]

Hi steffen, thanks for the feedback. That’s why I try to do both: an initial review and a full review

[@SergSolod]

Thanks Rob!

[@rc51bigdaddy]

Love your videos but have a question about Apple Watch Ultra 2 elevation accuracy. I go on runs without my iPhone and often the elevation numbers go away using the Workout app. I tried the Workoutdoors app and the elevation numbers stay but are often very inaccurate. In contrast my Garmin S70 always shows fairly accurate elevation readings. Have you posted any videos about this?

[@dedavgoli]

amazing test

[@ChickennSoupp]

Hi Rob, could you confirm whether the S9 has a new heart rate sensor? It seems that some media outlets are reporting an updated sensor....Or am I misinformed? Great video as always.

[@marcinx89]

We are looking forward for sleep test and SpO2 measurements during sleep. Great review though!

[@techandco.]

Thanks for the video !

[@TheQuantifiedScientist]

My pleasure!

[@whitefish2160]

When you retested the first gen Ultra was it on WatchOS 10? I noticed a GPS accuracy improvement when I went from OS9 to OS10. There were 3 spots that would regularly put me running through tall buildings on OS9 and after I updated to OS10 the run accuracy was much better. I no longer went through those buildings but along the actual boardwalk path.

[@Jonnynot1plate]

Hi, what watch of any serious would you say was the best at tracking steps for the day?

[@u.d.7543]

Rob, can you test weather a elastic band makes a difference, since Apple watches use those. I personally think that would make a huge difference, because elastic bands make sure there is tension at any time and make sure theere is contact between sensor and the skin all the time. I'm curious how Huawei watches would perform with elastic band.

[@m4t7eo]

In this tests he’s using nylon straps, which are not elastic, and behave like normal fabric nato style straps

[@NostalgicMem0ries]

as samsung user im really sad that apple is so ahead in smartwatches tech... their heartrate measurements and sleep tracking is best in class, why cant samsung copy and invent similar algorihms? this year they even reduced batery life and no improvements in measurements... while apple is as good and polar straps and aora rings.. wtf :O

[@individuo7618]

Or... this guy earn something to advertise for some brands of watches.

[@peteruzek]

As samsung products are half the price, you have to buy twice the amount of products so they have money for R&D. Just kidding ..

[@Kbax3614]

@@individuo7618lol how!? It is a known fact that apple smart watches are the best. You are just a salty ignorant hater if you can’t accept that.

[@glenpeeters5908]

Hi! Do you know whether the outdoor cycling workout takes into account whether one does this with a normal bicycle or a speed pedelec? (I have an apple IWatch ultra 2)

[@adiazlopez8]

Hi, are you gonna review the new garmins: venu 3 or vivoactive? Garmin claimed that they improved

[@TheQuantifiedScientist]

Yes I am!

[@Bigoppi]

I won’t upgrade from Apple Watch ultra gen 1 to 2 same as iPhone 13pm to 15 its scam

[@bristermat331]

I'm wondering why you did not analyze the sleep tracking

[@AbdurRahim-tr8xs]

Hi, I am kind off waiting for the Withings ScanWatch 2 review, are you testing that one?

[@TheQuantifiedScientist]

Yes I am! I asked if they would let me know once it is back in stock

[@Mau365PP]

Hi, are you gonna review the new Huawei Watch D? It measures blood pressure too

[@Chris34720]

I sent my ultra 2 back due to the heart rate readings I could be sat at home watching tv and my heart rate would read 39bpm tested a hueawei watch for a few days didn’t get the low reading once I’m now using a series 9 stainless steel not only is it more comfortable but it’s also seem to read my heart better

[@dalejayne2461]

Thanks!

[@tucsonastro7763]

Hello.....Would be great to see you review the new Garmin Vivoactive 5 and the Venu 3 or 3S. I'm thinking about purchasing one of these. Thanks From Tucson AZ USA, James B

[@mime454]

I wish you could use 2 polar chest straps. On a lot of these, if you look at the data and imagine you're working out, it's the polar chest strap that looks like an aberrant reading and not the Apple Watch. You can see it especially in the weight lifting session.

[@TheQuantifiedScientist]

Hi! Yes, good idea. I did that kind of analysis in the past. The only problem was that the one positioned a bit lower than normal was not optimally positioned sometimes, but I might try again

[@talega1]

Thanks for doing this tests. One brief question: the watch 9 you are using is the Wifi version or the LTE version? Have a nice weekend

[@TheQuantifiedScientist]

You're welcome! WiFi :-)

[@nl3712]

@@TheQuantifiedScientistthanks

[@lliillYMCMBlliill]

Can you do the test for the CMF watch pro from Nothing? Thanks for another amazing video!

[@mustafahasan1830]

Do you think iphone 14 pro max can get find my iPhone option in an update later as apple watch series 9 won’t find the precious location for Iphone models other than 15

[@slair76116]

Can you do a video on how you would setup your iPhone for the best body metrics monitoring ie Apple Watch polar chest strap what ever sleep monitor including the gear and programs and how you would use it for a good daily body metrics observation

[@mr.g8094]

Have you ever thought about creating a group on Telegram or any other place where your community could effectively exchange tips and experiences and watch updates, where you could publish surveys, e.g. which watch to test, where you could set up collections to buy a watch if the company does not want to send it for test?

[@TheQuantifiedScientist]

That's a great idea! And yes, I am thinking about a discord server or something

[@mr.g8094]

​@@TheQuantifiedScientistWherever you create a social group, it will be good, but I think that Telegram would be a better platform, more people have access to it, the number of downloads from the play store is 1 billion vs Discord which has 100 million downloads, Telegram is also easier to use. Thank you for your reply

[@brimee292]

Awesome vid thank you

[@TheQuantifiedScientist]

You bet

[@DigitalDamnation]

It seems that Samsung has updated their watches and my sleep tracking has improved. Any chance of doing a retest on their latest watch?

[@JastipKoreaEropa]

this might be a stupid question. if i wear AP on my left hand and i am doing dumbbell exercise on my left and right hand interchangingly. will the AP recognize the right hand activity? thanks!

[@asan1050]

The Quantified Scientist, Thanks Much !.......

[@brianquigley1940]

Great video... is the sleep tracking accurate?

[@onlyone2515]

Oh man you ve finally done it!

[@TheQuantifiedScientist]

You're welcome!

[@AlexZavalny]

You forgot timestamps. Other than that -- amazing content, I was waiting for it so much

[@TheQuantifiedScientist]

Thanks! I think the timestamps are fixed now

[@aaxer8052]

Please do a review on the CMF watch pro if you manage to get your hands on them

[@GaryFerrao]

thank you for this. 😊

[@andynyland2008]

Thanks, much appreciated 👍🏻🇬🇧

[@Windsurfingaddict]

Enjoying watching your latest review and findings, thought the video had skipped as no sleep tracking lol, I’m guessing that’s coming soon 🤓🤓

[@perfectlyaware2953]

I decided to buy Apple Watch SE 2022 based on your video

[@bestrro]

Hello , i use se 2 gen and sold for buying watch 9 , because oxigen EKG is cool function and new processor it's important ! this is 9 watch better se 2 gen in 30 % !

[@thestoik5440]

Hi, can you please review th Ringconn? Thank you.

[@ozzicarman]

ur vids are the best

[@williamjames3995]

The sudden drops in heart rate could come from burps. I know it sounds strange but I always get them with my heart rate chest device when i have to burp, maybe the air distorts the signal

[@chrislai3013]

Is there any decently reliable way of testing calorie burn on devices?

[@austcorn]

Could you make a review for the RingConn Smart Ring? It seems interesting since it doesn't have a monthly subscription like the Oura ring.

[@marcelinoplanas9397]

Waiting for the Garmin Venu 3 review... love my Apple Watch 7 but Garmin looks nice and round rs

[@nl3712]

Beware: Garmin software is terrible, especially when compared to apple

[@Andrea-dr6ed]

I can't find any ECG chest strap that can monitor health, which one you mean at 23:43 ?

[@322-Dota2]

I am winter runner and I got a problem with my apple watch 7 that it stops tracking heart rate in cold conditions like -5C outside while I am running.

[@micahjohnson9184]

Can't wait for you're Fitbit Charge 6 review when they release it! According to a Verge Article "Fitbit says the Charge 6 features the most accurate heart rate sensing of its fitness bands, with up to a 60 percent improvement on intense activities like HIIT, spinning, and rowing. The device takes measurements once per second during exercise and once every five seconds outside of workouts." Excited to see how they fair!

[@MrBasti1008]

Cooler Channel! Habe dich gerade erst entdeckt :)

[@darkomilosavljevic697]

You should check Nothing watch when it comes out...

[@user-vy3if6nk2o]

Thanks dude 🤙

[@TheQuantifiedScientist]

No problem 👍

[@FachrulNawawi]

Are u gonna review garmin venu 3...???

[@aufrufnachhall7310]

As a AWU user I still miss some Health Metrics like Body Battery / Training Readiness etc. I have installed both Athlytics and Training Today apps but not sure how reliable they are as a complement to the raw data from the watch. Any chance for a test? 😊

[@dutchovenguy]

I wear AWU and Garnin 965. Garmin software does a much better job of interpreting the metrics. Apple needs to revise the Health app completely. What are your thoughts on accuracy when wearing the watches on the inside of wrists? Apple recommends on top of wrist.

[@nl3712]

Another vote for an analysis of the Athlytic app for Apple Watch

[@paska68]

Can you test Huawei Watch Fit (Special Edition 2023)?

[@fullofmysteries]

Will you also check the Garmin Vivoactive 5?

[@granat9pk]

Why are there so few points in HR measurement comparasion for apple watch in comparasion to the galaxy watches for example where there are way more points?

[@amittrivedi2424]

Please try the smartwatch of the CMF which is the subbrand of nothing

[@WheelieGayJay]

Great video as always. I’d love to see a sleep tracking video with the Apple Watch 9.

[@RachelSchloer]

Really wished Garmin's had the HR measurements of Apple or the Apple Watch had the sports analysis like Garmin