Mi Band 8 International : Scientific Test

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Reference devices:
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Timestamps:
00:00 Quick Intro
00:57 Heart Rate Test 1 : Indoor Cycling
04:54 Heart Rate Test 2 : Outdoor Cycling
07:30 Heart Rate Test 3 : Weight Lifting
10:42 Sleep Test
15:53 Sleep Test : Comparison w/ Other Watches
18:04 Limitations
18:38 Recommendations & Conclusions
The Mi Band 8 international edition is finally out, meaning I could test it in even more detail than before, and it might be the device I’d recommend to a select subgroup of my viewers. Depending on when and where you get it, this device will likely set you back somewhere between 40 and 60 dollars, and for that price tag it is pretty impressive. In this video we are going to systematically and scientifically test the heart rate tracking and sleep stage tracking of this budget smartband. So, let’s get to it!
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, let’s skip any more intro, and get right to the testing. If you want to know more about what this watch can do, just check Xiaomi’s website. And I want to start off with the heart rate tracking accuracy. I tested this on myself during 6 indoor cycling sessions, 13 outdoor bike rides and 4 weight lifting sessions. I want to start off by looking at indoor cycling, since this is one of the easiest exercises for a watch to track.
But, what is my final conclusion on the Mi Band 8. Well, I find this a hard one. Just purely based on the tests that I did, it is not that great. It does a few things well enough, but nothing amazing. However, considering the very low price-tag and the fact that the quality of the screen and build is still very good, I am conflicted. If you just want a basic tracker that can track your heart rate quite accurately when you are not moving too much and will roughly keep track of how much time you spent in bed, then the Mi Band 8 is still a smartband I can recommend, specifically because of the low price-tag. It’s not going to come close to the performance of an Apple Watch or Pixel Watch, but you can buy about 10 Mi Band 8’s for the price of one of those. Just looking at the general sleep and heart rate tracking, I would give the Mi Band 8 2.5 to 3 out of 5 stars.

КОМЕНТАРІ: 290

@TheQuantifiedScientist 6 місяців тому

@rainerrain9689 6 місяців тому

You need to start reviewing foot pods that track many things,stride and cadence just to name a few stats. All you ever test is your biking and sleep data, widen your horizon !

@primary4075 6 місяців тому

Is it just me or is it better to have a correlation analysis rather than a regression? Just show then correlation table. BTW, is it still HUAWEI band better ?

@MultiMrrog 6 місяців тому

can you recommend a better site for data analysis ?@@rainerrain9689

@anydugen Місяць тому

the 8 Pro seems off. If I wear the MiBand 6 and the 8 Pro together, the difference is an overestimation of 28% on the Pro

@manorho0285 Місяць тому

How did you export the data on band 8 ?

@dameanvil 3 місяці тому

00:00 🏃 Mi Band 8 International Edition's price ranges between $40 and $60, offering impressive features for the cost. 00:59 🩺 The Mi Band 8 generally shows good agreement with an ECG chest strap for heart rate tracking during indoor cycling, though slight delays in detecting heart rate fluctuations were noted. 03:47 🚴‍♂ The Mi Band 8's performance in heart rate tracking during outdoor cycling is significantly less accurate due to increased wrist tension and movement, resulting in lower correlation. 07:45 🏋‍♂ During weightlifting, the Mi Band 8 struggled to track heart rate accurately due to increased wrist tension, resulting in low correlation and inaccurate readings. 10:47 😴 Sleep stage tracking by the Mi Band 8 had low agreement with an EEG headband, particularly in differentiating deep sleep, light sleep, and REM sleep, making it unreliable for sleep stage tracking. 17:23 🌙 Overall, while suitable for basic heart rate tracking and tracking time spent in bed, the Mi Band 8's sleep stage tracking isn't reliable, receiving a low rating due to discrepancies with reference devices.

@fridaphonebackup6599 3 місяці тому

Thank you 😊

@manorho0285 Місяць тому

Compared to mi band 7?

@famhentea6594 Місяць тому

This level of transparent testing should be the standard for any product on the market. Saves us from falling for sexy marketing videos and instead focusing on the actual function it's supposed to serve. Thank you for taking the time to record and share the results!

@Fremmy 6 місяців тому

While I may not be inclined to purchase this device, I genuinely value the content you create and the dedication you invest in producing these videos.

@afgaesthetics 6 місяців тому

I love your analysis videos, the way you have all datasets from different watches and then comparing them with the new one is awesome, it really gives me hope to continue my journey of learning Data Analysis and Data Science

@timmyo-tool2233 3 місяці тому

Thanks so much for the detailed reviews you do!

@siiddrb 6 місяців тому

Hey Rob! Excellent review as always! Super in depth without boring the watcher! Could you please test the Ultrahuman Ring Air next?

@xanjelx Місяць тому

great review dude. the data and presentation blew me away!

@ojuliovieira 6 місяців тому

Thank you for doing this so quickly.

@pere_gin 5 місяців тому

Do you think using other software/apps for the sleep tracking may improve the sleep tracking performance? Or do you think it's an issue with the hardware/sensors? It would be cool if you tested some popular alternatives, as a lot of times companies cheap out on the software side of less expensive devices. I do understand though that this would increase the testing time and complexity quite a bit. Nice video either way!

@kwakithailand 6 місяців тому

My 👍 as well as comment are well deserved for your restless work, brother 💪

@user-sw7mj4oi8p 6 місяців тому

Thanks for the Test. Retailers in my area are offering discounts. How are Venu 3 and Vivoactive 5 measuring and monitoring results different or almost identical? After all, prices vary widely. I need advice. 😊

@samiboy1368 5 місяців тому

Unbiased review, thank you

@jehoiaderabaya8201 3 місяці тому

The pricing category is different, hence I expect testing in different aspects too such as in steps including walking and running, stairs, sleep, etc. not so much in intensive and professional activities such as outdoor cycling, gym, tennis, but certainly a plus if it has certain capabilities.

@TripleIProductions 6 місяців тому

I was considering upgrading to this device. Thank you for the review

@trilight3597 2 місяці тому

I wish I knew earlier. But I know to get a different watch in the future.

@dimakonstanta1868 6 місяців тому

Big thanks for the video!

@MehediHasan-hc1sc 4 місяці тому

Your scientific analyses are excellent. Step count and running distance measurement accuracy test would add extra insight about performance of the watches. Thank you.

@erb34 2 місяці тому

I've heard the previous version of the watch is much more accurate at step counting.

@GradualReportSerbia 2 місяці тому

Amazing work!

@ekongusan 6 місяців тому

I always enjoy watching your analysis video for smartband and smartwatch. Because i've been using quite a few smartwatch and smartband for exercise. And your video helped me knowing which one is better for each health features. A few months ago i bought Redmi Watch 3, and while i'm exercising, i often use it with other watch (Ticwatch) or pair it with smartband (Huawei Band 7) to compare the accuracy of the health data (exercise/sleep/gps accuracy etc). I hope maybe you could do a scientific test for the Redmi Watch 3. 😅 Because i think for that price range, it packs quite a lot of features. Anyways,.. Keep doing what you do! Really help me to keep up with smartwatch and smartband health technology. Thank you 🎉

@kellyherrin 5 місяців тому

Hi, I just want to say I'd love to see a review by you of the Ultrahuman Ring Air. Personally, I'm mostly interested in learning about the details and accuracy of the sleep-tracking function.

@kreesod 5 місяців тому

mi bands are great only at one thing, and is notification handling, they offer good integration and decent granularity via android third party apps, this added to their usually great lifetime per charge makes it a good option despite its drawbacks

@FrankvanCaspel 3 місяці тому

Heya Rob! I wonder if you have any information about what the 'stress score' that the Mi Band 8 gives is based on. Is it (only) heart rate variability, and do you know of some way to get HRV-data directly from the band? Update: I asked Xiaomi and they said "The watch evaluates the current stress intensity by comparing the current heart rate variability data with the individual's heart rate variability when sleeping and relaxing. It also takes into account the individual's limb activity tracking to assist in the judgment. When heart rate variability is significantly weakened during low-intensity physical activity, it indicates a higher intensity of mental stress. The watch continuously monitors the pressure value changes throughout the day and displays the current pressure value." No idea how they get to the 'mental' part there, but yeah: it's based on HRV, and there's no way to 'reverse engineer' HRV based on the stress score. I'm hoping for an update that'll allow this.

@Canasket 5 місяців тому

Actually heard this is pretty accurate for the most part. I have ghe band 6. Tempted to get the 8 but I'll hold of for the Mi band 9 and see if an extra jump can sway me.

@Blashyrkh666Raven 5 місяців тому

I do weight lifting (high amateur level) and my heart rate spikes are taken absolutely fine and the range goes from 90 to 140bpm and slightly more as it should. Honestly looking at his graph low heart rate for this activity I would say that there are "issues" in his testing. Don't know if for his anatomy or placement issues. But his findings are definitely not to be taken seriously or for everyone. -

@maxquaini1340 4 місяці тому

Tbh I'm also having accurate results, pretty much better than the charge 6, maybe our bodies are responding differently

@kinzokushirogane1594 4 місяці тому

Did you regularly clean the sensors when doing outdoor cycling tests? Theres always a layer of sweat and crud that builds up on the sensor, and it makes or breaks it.

@joshuagaughan1520 6 місяців тому

How are you able to get the data from the very first plot? I’m a stats major and it would be really cool if I could do analysis of my own from my own device(s). Thanks!

@alejandroschab386 6 місяців тому

Hi Rob could you do a review of the Amazfit Band 7 or Amazfit BIP 5? Thanks

@user-eq1qk1ww8d 6 місяців тому

The heart rate accuracy of Mi Band 8 has improved surprisingly compared to the previous version.

@TheJeep3000 4 місяці тому

Correct but it went from very bad to a little less very bad. So in absolute results, it's still crap. The only difference is time, firmware updates have improved the Mi band 8 a little. I think if the Chinese versions were te-tested they would show similar results.

@lliliililililililll 3 місяці тому

@@TheJeep3000 can you recommend any good device when running with?

@TheJeep3000 3 місяці тому

@@lliliililililililll Huawei Band 8 and the Huawei Watch fit 2 did good on running. The Huawei Health app is also very focused on running. Otherwise the more expensive brands like Garmin. The Garmin app has excellent sport analytics.

@fridaphonebackup6599 3 місяці тому

Check the review of the Fitbit charge 6 by Rob!

@anydugen 2 місяці тому

Can you do a quick update on the step counter please (preferably for the Smart Band 8 Pro)? Mine seems to be SHOCKINGLY inaccurate. There are lots of complaints online as well. Thanks!

@samedyalcn9142 5 місяців тому

Can you draw a correlation vs price chart? It might help us decide which equipment to buy better.

@guillaumedalle6952 4 місяці тому

It's a great idea

@gammelgemse 3 місяці тому

@@guillaumedalle6952 its a terrible idea. Prices vary wildly, even by country, region and such.

@sergioc5468 3 місяці тому

@@gammelgemse Yeah sure, but you can get an idea. Comparing a smart band of ~35€ vs a watch of ~300€ doesn't seem fair :) You have to compare smart bands/watches in the same price range.

@gammelgemse 3 місяці тому

@@sergioc5468 I completly disagree. This channel is about comparing technical capabilities and accuracy thereof. This involves a lot of work. Googling for prices you can do youself in 5min.

@souphuhn 6 місяців тому

Waiting for Venu 3 test! Thanks

@cort 6 місяців тому

Thank you, been watching your videos for a long time but I never seen watches like Polar M430 which is said to be best for runners. Also they say it's pretty close in terms of HR to Polar H10 and it does have Sleep Tracking though I'm not sure if it really works as I don't have anything to compare it it. Would you be able to test Polar M430 or it's older brother Polar M400?

@Smitecrawler 6 місяців тому

Could you also add the Charge 4 to the sleep graph to see where it ranks against the others? It should be rather similar to the Charge 5, right?

@anydugen 4 місяці тому

Can you please do a monthly top 3 or top 5 watch/band/ring list? We all trust your evaluations, and we luv ya, but a summary which might be updated quarterly, would be spectacular. You are the best in this space, just please update ranking your evaluations a bit more current (my explanation is convoluted, but I think you understand).

@maxpowell3984 6 місяців тому

@thequantifiedscientist what watch will you choose for overall health tracking(no apple)? And which one considering app and battery life? I think app should show more results and be more user friendly giving recovery results based on hr and some others😮

@patrykK1028 6 місяців тому

Very impressive. Also was that Vienna in the cycling segment?

@netscrooge 6 місяців тому

Will you be reviewing Oura ring with the Apollo Neuro device?

@cs8425 4 місяці тому

This is exactly what I was looking for

@flaviohemerli6160 6 місяців тому

I was afraid that this video would come out after I bought the Huawei Band 8 (largely thanks to your video about it) and show that the Mi Band 8 was better. I'm very happy that, for what I need, this is not the case.

@QuiteTab 6 місяців тому

Do the Huawei band 8 match the expectations so far? I'm thinking of buying it but aside from this review lots of people are not recommending it for it's looks. I know mi band 8 performed horribly but I can't deny that it looks good with it's metal body unlike the plasticity looks from the Huawei band 8.

@Adam-M1 5 місяців тому

@@QuiteTabmi band 7 seems to outperform both on sleep.

@gagandeepswali6473 6 місяців тому

Getting the right information about electronics is really tough these days, i am thinking of buying a Xiaomi watch pro 2. Would you make an analysis on this @the quantified scientist

@dariomendoza9136 6 місяців тому

Hey Rob could you test the metrics from Garmin vs Apple. Apple has a more accurate sensors but takes measurements less often. Garmin has a less accurate sensor but continuously monitors HR.

@quinnchau7166 6 місяців тому

Will you review Scanwatch 2 anytime soon?

@ceripz_1911 Місяць тому

clear and nice elaboration

@yuvrajsehgal5743 6 місяців тому

Awesome video

@timeTegus 5 місяців тому

Are you going to test the new Polar Vantage V3 from Polar? Maybe this smartwatch is good enough in sleep tracking and does not stalk me like the Fitbit/Google watches. I don't like it when I need the internet for data syncing or a Google account or a subscription.

@artgeepyz9119 6 місяців тому

Hey Rob!! Can u test TicWatch 5 pro and Huawei watch fit SE??? 🎉❤

@agfeergaming 5 місяців тому

How about the mi band 8 pro with gps? Please make a review. Thank you

@zen8 6 місяців тому

Will you review the s3 soon?

@darkkforest 6 місяців тому

I was planning an upgrade from my Mi Band 4 ( which is holding pretty strong,, loved the battery life), but I will give this one a pass.

@annaboyechko 5 місяців тому

Will you do Whittings Scanwatch 2?

@kingjasko 5 місяців тому

what budget smartwatch (sub 50€ lets say) would u then recommend?

@lecturadelad-laz5174 5 місяців тому

Honestly i think for it's size it does things really well compared to bigger smart watches like the apple one or the google one

@McQuack82 4 місяці тому

It would be interesting to do some experiments on how much after market band strap replacements change the accuracy. All the high performing watches use are wider displays and straps. Some of the inaccurate readings may be result of just keeping the device in better position more consistently to reduce the false readings more.

@lukas______ 3 місяці тому

That seems moreso tightness of band rather than width, though the width could indicate more stability so maybe you're onto something.. I doubt it'd be a significant difference though (width of band)

@Levince36 3 місяці тому

Thank you very much for your video.

@jessontann521 6 місяців тому

Waiting for the garmin venu 3 plsssss

@user-yv9kv6to3x 3 місяці тому

Hey does someone have experience with the accuracy whenn jumping rope?

@P4piNan0 6 місяців тому

Waiting for Xiaomi watch s2 pro test. Nice video ;)

@condenser 6 місяців тому

Where can we find the data, or at least the final ranking graphs?

@user-kl2dm1qp3l 6 місяців тому

Can u teste Ticwatch 5 pro and Huawei watch fita SE?

@CrazyKosai 6 місяців тому

3:56 WAIT, how can MiBand7 be in your graph around 0.66 (R) if year ago it had (in the same test in your own video) 0.92 (R)?

@gammelgemse 6 місяців тому

This is very shocking indeed! 🤔

@Lisdex. 2 місяці тому

random nonsense video

@aphrodieMonkey Місяць тому

Not the first time..

@user-zi1jm8th5k 6 годин тому

I don't see it...

@MrMorton 6 місяців тому

Hi Rob, when comparing successor watches, it might be a good idea to show the results compared to the highlighted previous models. This device is a very affordable device and quite impressive for the price and though it'll never compare to an expensive watch many will want to know if they should upgrade their previous model to the new. I think another useful item to include in all of your reviews would be to mention the heart rate sample rate. I used a Mi Band years ago and remember it taking a low number of heart rate measurements per minute and this will dramatically affect its ability to keep up with quick heart rate changes. Love your videos!

@aphrodieMonkey Місяць тому

Exactly ! Thanks

@GiuseppeSavo 6 місяців тому

I'm waiting for the video on the new Amazfit Balance. It seems quite better respect to other amazfit devices in HR monitoring and in gps precision.

@TheJeep3000 4 місяці тому

I love Amazfit devices, too bad it's a typical Chinese budget brand with a focus on marketing and hardware specs and not on content. Their firmware and algorithm is just underdeveloped in the beginning of each product launch. That said, they do update firmware. I wonder if a new test on recent firmware will show better results.

@GiuseppeSavo 4 місяці тому

@@TheJeep3000 I think so. But onestly it seems that amazfit started supporting more recent devices better than in the past.

@parito5523 6 місяців тому

Would be interesting for you to make a review of the new 2023 withings scanwatch

@ddm_807 5 місяців тому

Hey, can you test Casio DW H5600?.. as it is powered by Polar

@10xman9 8 днів тому

It would be nice to see how it would perform during running, as most people don't tend to clench their hand during runner but rather pretty relaxed hands. Would that give more accurate reading similar to stationery cycling? Thanks again for the wonderful scientific approach.

@thelostyaksha 6 місяців тому

Can we have a tier list before the end of the year?

@ApacheSenzala 2 місяці тому

Will you test the Casio dwh5600 and ghb-2000

@ucup33 6 місяців тому

Venue 3? 😊

@luaphut9402 6 місяців тому

Will you be testing the Amazfit Balance?

@fullofmysteries 6 місяців тому

Waiting for Garmin Venu 3 and Vivoactive 5 🤞

@werner77wda 4 місяці тому

Thanks for the video! Huawei band 8 in this price range is the way to go.

@hollminator9382 5 місяців тому

Scientific Reviews Are just the best. Just pure facts ☺️

@thomason993 5 місяців тому

Any chance to test Garmin Venu 3?

@MohammedAli-le5go 6 місяців тому

Where is the Venu 3 test we have all been waiting for?

@kake6954 6 місяців тому

Exactly

@MrInferno007 6 місяців тому

Yes! I was sure it's going to be the next one

@_icscata_ 16 днів тому

Will there ever be a Redmi Watch 4 review? 🥺

@fxke.126 4 місяці тому

So what is the best watch at low price ?

@yksmadur4678 2 місяці тому

I bought Mi band 8 but these videos confused me. What can you recommend in this price range? (I may increase the price a little more.) Pls

@user-zh8pe1jt8x 6 місяців тому

Hi,will you test Amazfit Balance?~

@kozinminaung4121 5 місяців тому

Which band or watch should I buy to track my sleep? I've been struggling with sleep and need to know hour many hours I sleep in a night. I can't afford too much money and need the most accurate band or watch with effortable price

@nimapersia3143 2 місяці тому

Howavei band7

@harshasai6542 6 місяців тому

Hey, Rob can you just add a small section where you mention if the watch you are reviewing can be connected to polar H10 to improve the heart rate accuracy. Thanks in advance

@reinierpruszner4961 6 місяців тому

When do you launch the review of the Garmin venu 3!?

@TheQuantifiedScientist 6 місяців тому

Editing the video right now 😊

@reinierpruszner4961 5 місяців тому

Hoi, vraagje, ik heb de Garmin venu 3 gekocht, super happy, maar kan ik hem ook omhouden met boxen, of zullen de trillingen een negatief effect hebben? De FR265 heeft een boks optie, de venu 3 niet. Let me.know!

@reddevved 5 місяців тому

I'd like to see some price to performance charts

@Marllon_333 5 місяців тому

*Amei demais esse seus testes, queriam muito um canal como o seu na versão brasileira, vou comprar a Mi Band 8 pq não tenho muita grana, mas é uma pena não ter sido aprovado nos testes, mas vai servir pra mim mesmo assim, se puder, faça os testes com o Amazfit Active por favor! Ficarei agradecido!*

@258Loures 5 місяців тому

Huawei Band 8 é melhor apesar de não sincronizar com o Google Fit

@Marllon_333 5 місяців тому

@@258Loures *sim, já ouvi dizer que a Huawei Band 8 é ruim em monitorar o sono, não sei se é verdade*

@BaymaxIsBig 3 місяці тому

Can you do the Xiaomi watch 3?

@relaxingbehavior252 6 місяців тому

we are waiting for amazfit balance and garmin venue 3 and also amazfit falcon

@mohammadzubayer4464 6 місяців тому

Could you please review ultrahuman ring?

@gynspeed777 5 місяців тому

O Huawei Watch Ultimate é o smartwatch mais bonito já lançado! Você poderia testar!

@SalitosInside 5 місяців тому

Great !

@naqib4235 4 місяці тому

So better to get Mi Band 7 instead?

@AndrewJohnYoung 4 місяці тому

Saved money due to this review... Love your scientific method

@theowijaya3203 6 місяців тому

how about for running?

@TheInnerEngineer 4 місяці тому

Do an analysis on Crossbeats Armour

@TauBuuVuong 5 місяців тому

What about step counting test? 😭

@TommasoPaba 6 місяців тому

I know this is cheaper, but the accuracy and features of the Charge 6 are one level above... More accurate and it does ECG and Afib... and I think it's better to spend $150 for a very good product than $80 for an average one.

@efandras666 13 днів тому

Please review Mi Band 8 Pro accuacy test 🙏😁

@RafaGmod 6 місяців тому

You have plans to test the bioimpedance scales too? Would be very cool this kind of content! And maches completly the channel! (I wanting to know how much i can rely on my scale measurements do not encourages this comment xD)

@scala3898 6 місяців тому

what a good idea!!

@TheJeep3000 4 місяці тому

The thing with these Chinese branded devices is that in the beginning, at launch, the firmware is always pretty bad. The marketing has a focus on hardware specifications and low price. So development and testing on the algorithm is always lagging behind the launch-schedule. They do improve over time through firmware updates though. Especially with Amazfit, their devices have good hardware but software laks in the beginning. I think that now, after a long time, the results are better than what they were. Not Apple-results, not ever of course, but better than they were at the beginning. I hope they can ever be re-tested. The GTR/GTS 4-series is beautiful and they have such great hardware, hopefully these can be re-tested to see if they improved. Because I think they did.

@FrankvanCaspel 3 місяці тому

Interesting! I'd be interested in a re-test of this device with newer firmware, if only a limited test.