Apple Watch Series 8 : Full Scientific Review

🟡 Twitter: @QuantifiedRob
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Timestamps:
00:00 Intro
01:04 Heart Rate Test 1: Spinning
04:40 Heart Rate Test 2: Walking
05:21 Heart Rate Test 3: Cycling
08:11 Heart Rate Test 4: Weight Lifting
10:14 Heart Rate Issue: Strava Export
11:31 Sleep Stage Test 1
16:49 Sleep Stage Test 2: Overview
18:23 Temperature Sensor Discussion
19:35 GPS Tracking Test
21:58 SpO2 Test
24:28 Step Test 1: Real Steps
26:30 Step Test 2: False Steps
27:55 Conclusions and recommendations

Over the last 4 days I have extensively tested the new Series 8 Apple Watch for its sports and health tracking performance. In this video we will take a comprehensive look at the heart rate accuracy, sleep tracking performance, GPS tracking, oxygen saturation measurements and step counting accuracy of this brand new watch from Apple. I will also make a few quick remarks about the new temperature sensor that Apple added.

In this video I will focus on unbiased performance testing of this new Apple Watch. So, without further ado, let’s get to the test results, and I want to start off with the heart rate tracking results. I showed you a first test in which I did 5 training sessions in the last video, but I now more than tripled the data, which means I tested the Apple Watch Series 8 during a total of 16 training sessions.

Looking at the Series 8 Apple Watch as a whole, I am quite happy with its performance. It has some of the best heart rate tracking and sleep tracking out of all the devices I have tested; And in my cycling tests, it also has pretty reliable GPS tracking. The step counting was also quite good, and the only thing that was not great were the oxygen saturation measurements. The main downside of this watch is the relatively short battery life of the Apple Watch. You need to be really consistent with your charging schedule, and find some time each morning or evening to top off the charge. However, as long as you are willing to do that, and you own an iPhone, the Apple Watch is one of the best sports and health trackers out there. The main thing that is still missing with regards to health tracking, is providing advice based on the health measurements it takes. Still, overall, I would give the Apple Watch Series 8, 4.5 out of 5 stars.

[TheQuantifiedScientist]

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🟡 Twitter: @QuantifiedRob
* Affiliate (paid) links support the channel by earning me a commission on any sale, and it doesn't cost you any more! My opinions are completely my own, and this content is not sponsored.
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[SimonMezgec]

As a fellow scientist, I can't tell you how much I appreciate your methodology, proper data gathering and well-explained analysis! Extremely well done, you're by far the best reviewer of such products I've come across - keep up the great work!

[stefan]

I said it a few times and i am going to say it again. This channel will blow up even more than it is already! Nobody can match this quality of content in regards to smartwatches.

No bs, straight to the point and amazing data! Especially considering that these smartwatches are straight up lying and intransparent in regards to their effectiveness

Keep going!

[Actor]

Someone give this man a medal already, YOU ARE THE BEST SMARTWATCH REVIEWER OUT THERE . Period. Kindly please consider testing Amazfit GTR 4, We Indians are waiting as it is the only cheapest reliable smartwatch brand in India 🇮🇳 👻

[BobbyBarrigan]

My mother had open heart surgery last month so taking accurate heart rate measurements is a big concern. I was wondering what watch to get her, and after your last video on the Apple Watch series 8 I went out and got her one that same day. Really appreciate there’s somebody out here looking at the science of these watches. Keep up the great work

[blushandsky]

I’m informing myself right now before buying my first Apple Watch and honestly - your reviews are exactly what I was looking for. Comprehensive, detailed yet clear, thorough. I appreciate a lot the work that went into testing and data analysis. Thank you, Rob! 👍🏻 Amazing work!

[jayhuda]

I dont usually comment but this is something else. The amount of data you have on all these watches is exactly what I needed as a science student. Thanks so so much, you've earned a subsciber!

[geofferychang]

Long time Fitbit supporter here, I started to look into Apple watch when I had a heart problem few weeks ago and during an EKG check, my doc recommended Apple watch for me to monitor my heat, and that's why I absolutely love your review! The comparison with Fitbit and Polar, this convinced me to say goodbye to my money and get a series 8. Thank you for your great works!

[ryangunniers]

Incredible content… Fact checking big corporation claims are so important!! I appreciated your process and how you explained how you went about your research! One day it would be interesting to introduce other ‘test subjects’ to see how these watches works on different size wrists (more or less fat and muscle)

Don’t be afraid to dip into the nitty gritty details of coding and more so that way we get a better idea of your process and see what you are passionate about.

Thanks again!

[LordDarthNintendoe]

No shouting and extreme just simple and calm content, love it, keep up the good work

[yesiamsharon]

The only true evaluation channel I've seen. Thank you so much for the effort.

[tpmit]

I love your reviews. I am fed up with some reviewers that only regurgitate specs. I am interested in the Sense 2 and how it compares to the Apple watch 8 (it is expensive to switch ecosystems). When are you going to review the Fitbit sense 2 (shortly after the release next week?) Do you think it is worth waiting for it as compared to the Fitbit charge 5?

[XimenezJr]

After watched many of your videos.
1. You are an underrated youtuber.
2. Your channel is One of a kind. No one make useful scientific reviews like you do.
3. I’m subbed.😂

[YukalayleeGames]

Aside from all the usual goodness, very grateful for the definitive informed opinion on the temp sensor in particular. Literally not answered anywhere else on the internet...

[Darthus]

Curious to see how this compares to the Fitbit Sense 2 consider they offer a similar set of sensors at a lower price.

[.name]

I m not a scientist. But I can see for sure the amount of hard work that goes in just one video like this.

[mcmable]

Ich verfolge Dich ja schon lange. Danke nochmal insbesondere jetzt auch hier für die umfangreichen Tests. Super das Du auch GPS und Sauerstoff drinnen hast!

[Dev-Austin]

Phenomenal, in depth and concise as always. I had to send this video to my brother as we're both in the market for a new smart watch.

I can't wait to see your review of the S8 Ultra.

Great work!

[youngsahm]

Incredible work! So grateful for all of your effort and expertise.
The main issue with the Apple Watches seems to be impractical battery life.

[deanwinchester]

He is the YouTuber one need to watch before making any decision which watch to He is the best from the rest....