Mi Band 9: Scientific Review

[@TheQuantifiedScientist]

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[@aaakmm1785]

I am so glad that you included "walking outside" activity. It should be included in all your reviews for people that are less sport oriented but still want to track simpler activities.

[@ripxrip]

Agree. Walking is my preferred cardio.

[@jayshukla4926]

Fully agreed.

[@user-ij8no5zw6u-]

Yes, I hope so as well! Walking is easy, but as we can see not that easy for many devices.

[@JanZamani]

Agreed! Walking outside and inside (treadmill) is my main form of exercise. Maybe a short amount of weightlifting which is not even worth tracking. Walking, sleeping, resting (or background) heartrate, maybe sleeping SPO2 are the most important metrics for me to track.

[@TheQuantifiedScientist]

Thanks for sharing that input!

[@ItsNicolau]

Xiaomi always states that they update the sensors and algorithms and that the accuracy increases by a double-digit percentage, but every year, the results are more or less the same. It's a little disappointing. Thank you, Rob, for doing these reviews! You're amazing. Take care!

[@TheQuantifiedScientist]

Thanks Nicolau!

[@Blu3_777]

Question what's the importance of the heart rate accuracy and what does heart rate determine?

[@trym2121]

​@@Blu3_777 if you have a serious disease it can determine whether you stop activity or keep going and go straight to ICU Of course, people with such condition won't use unreliable cheap Chinese health trackers. Heart rate, Huawei is decent but Apple is still the king

[@malikulamin9948]

@@Blu3_777 its estimate your calories and heart rate

[@bautifas6610]

imagine if you have a 1% margin of error and you improve it by 10%, you would have 0,9% margin of error, thats why it doesnt change much

[@B6ka]

Thank you, indoor performance seems quite good. I have been using Mi Band for 1.5 years, not bad for heart rate measurement and keeping track of exercises. It is also good that I do not have to pay subscription fees on analytics and charge it once per week only or so.

[@Gamerglotzer]

That is real dedication! Even testing Smartwatches during travelling and work. Thanks Rob for your effort!

[@mkriiger]

The best test on KZbin, as usual. Thanks for the amazing work.

[@p.a.2712]

Been waiting for this review for months! Thank goodness!

[@arnolfinilmf]

I had my first Mi Band 4 for 3 years and today I have a Miband 7 and a Huawei GT Pro 3. I have to confess that despite knowing that the Mi Band is crap, it attracts me a lot. I love the simplicity, the design and the more than two weeks of battery life. For me, it is practical, cheap and everything I need for my day to day life. I am considering buying a Pixel 4 in the future because I live alone and it has some security features that I find very relevant. Other than that, I continue with my Mi Band.

[@TheQuantifiedScientist]

Thanks for sharing!

[@adaninurs]

my huawei band 8 last a LONG time too! absolutely love the battery life!

[@ItsNicolau]

Let's go! I have been waiting for this for weeks! You're the man, Rob, thanks!

[@main-iq9jx]

Thank you so much! your types of tests are so important to divide the companies that are actually trying to make a good device vs companies that give you minimum effort for your money. And these 50$ devices seem to be the most sold products since so many people can afford them

[@Marllon_333]

*Finally, I was really waiting for this review!* 😁

[@arnolfinilmf]

Mee too! ✌️

[@TheQuantifiedScientist]

You're welcome!

[@eduardg5619]

Waiting now for the review of the PRO model ❤

[@Marllon_333]

​@@TheQuantifiedScientist😁

[@SillyMonkeysLikeApples]

last year I got a huawei band 8 because it was the most accurate heart track for as cheap as one can get, and I dont regret it at all, its great and works perfect, I really appreciate all the data you bring us and all the time you spend on this, if there is a way I can donate some money let us know please, just as a token of appreciation on saving us time and money on making the right purchase right off the bat

[@Spacemonkeymojo]

Been waiting for this video for a while now! Thanks Rob, and I'm sorry to hear about your breakup.

[@CarotenCake]

Thanks you're realy doing a great job, best tests i've seen so far

[@TheQuantifiedScientist]

Thanks!

[@nicholas4975]

FINALLY, the mi band 9 scientific review after so many months!

[@gwendolynveronica]

I'm always so excited to get notified about your new videos on MiBands! I've had the MiBands 7, 8, and 9. I didn't use them much for exercise tracking, mostly as a general tracker for my sleep, since I used to have some issues. Honestly, I did have a very good experience with the 7 tracking my sleep. It felt like it caught my wake-ups within the minute. I decided to upgrade to the 8, and frequently found it recording I was asleep 20 minutes past the time I had actually woken up. I was seriously disappointed, and waited eagerly for the 9. I'm now finally wearing the 9, and I absolutely feel it is an improvement from the 8, but it does not compare to the 7. I'm always hoping for software updates to come around to improve the sleep tracking, but I'm always disappointed. Your sleep data just about perfectly reflects my personal experience with the Mi Bands. I've just ordered the 9 Pro, I'm hoping it'll be better. Please do a video on the 9 Pro too!

[@GiuseppeSavo]

well... now the question is "how can be a device like this one worse in walking than in running?!?".

[@RedPanda_00806]

+1

[@TheQuantifiedScientist]

I don't understand it either...

[@petrovsk]

I think that the reason for this is : when tracking an intense activity, the sensor takes more readings, with more processing to for a reliable good reading, while when you're walking (less intense activity), xiaomi wants to save power/energy, using less readings and processing, making the data less reliable

[@stureericsson9545]

You best have it set to take the heart rate at one minute intervalls(or does smart interval take take h.r.more frequent during more intense movements?(i.e.&exercise wirh higher heart rates?).

[@muhwyndham]

My best bet as a software engineer is that their HR tracking is not always turned on but turned on based on event. The event that they tracks is using proximity sensor deviation. In walking, the deviation is considerably smaller (you swing your hand less and your body bounce less) so there's possibility that there's less event to trigger the HR tracking, resulting in not so good details (like highs and lows), but maybe acceptable average.

[@joaomoreira7251]

You're such a great guy man, wish all the best buddy, hoping to see t rex 3 here.

[@ethansutio7577]

Haven’t seen any reviews for the Oura ring 4! I’d love to watch one from you!

[@mathiasjunnielsen]

And Ultrahuman and RingConn!

[@_icscata_]

Great review, Rob! Your reviews are extremely detailed and this is awesome! 👏🏻👏🏻

[@Brandencarroll1]

I'm dying to see your Oura Ring 4 review!!

[@michaelcorcoran8768]

One thing that's cool about these is that after 6 months or 9 months or whatever even 12 months you can get them for $0.50 on that dollar. 25 30 bucks sometimes

[@MrMorton]

Impressive improvement for this tracker. Had a much older one (Mi5) and loved the battery life. Is the app any better? I'm impressed with how many devices you wear at one time! 😂. Thanks Rob for all your effort!

[@TheQuantifiedScientist]

Thanks! The app is OK, but definitely nothing special. And thanks for becoming a member :-)

[@mathiasjunnielsen]

Can we get a test of more smart rings? I would love to see Oura Ring 4, Ultrahuman and Ringconn 2 ❤

[@iTooob]

You should upload the charts online to a website of yours and even, if possible, make them interactive! Awesome videos.

[@googlekullancs564]

honestly, for me it's more than enough. correlation rate being above 0.8 all the time is enough for 50 dollars. I'm impressed.

[@Raivo_K]

Bought one about a month ago when the glass on my Band 4 eventually broke and rendered it unusable. I obviously bought it for price and battery longevity. Not so much for accuracy. Few remarks on the device overall: i like the much slimmer/flatter profile compared to earlier Mi Band devices. Also the metal shell seems to make it more durable. The screen is significantly improved in both the brightness, resolution, size and refresh rate. The bad thing is that the default wrist rest is still the same silicone one. From my experience from Band 4 i can tell that this will break apart in a year forcing me to buy a new wrist rest to replace it. Battery lasts just about 7 days like i want with maxed out brightness, heart rate, blood oxygen and heart rate monitoring. I disabled the stress monitoring as it seemed pretty useless. First few days after charging the battery quickly loses 20-30% of the charge but holds up very well in the 70-20% range. Below 20% it again starts draining quicker and offers to enable battery saver at 5%. This is with five days of nighttime outdoor walking (about 8km) and two 40 minute weight lifting sessions in a week. So far im happy and it's a clear upgrade from my old Band 4 model.

[@SimoneDoyle-e8t]

Love your vids. When will you be creating a vid on the Oura Ring 4?

[@donovanguthrie8958]

Thanks for all the reviews! PLEASE keep the walking tests...so important to people my age...

[@brunoteixeira4301]

Thank you very much. Put the Xiaomi S4 on your future review list🙌

[@Md.Al-ShahriarNafiz]

Lets gooo bro🎉 i was waiting for this video from last 2 months❤ love you bro. Love from Bangladesh 🇧🇩

[@abdullahalamin1263]

Hey man. Really love your in-depth analysis using statistical graphs. I am confused between the Amazfit Balance and Amazfit T-Rex 3. Which one has the more accurate tracking overall?

[@OMGitsBababoey]

Thank you for all the content! But please take care of yourself! I know how hard it can be to juggle life + youtube!

[@TheQuantifiedScientist]

I appreciate it!

[@3jerryliu]

Hey there! Your videos are super interesting and helpful. I used them to help me decide my last watch to buy and I'm watching again to decide if that should change any time soon. However, I have 2 suggestions that I think would make the data visualization more clear AND impactful to the viewers (would be cool to hear your thoughts even if you don't agree!) 1. The current line chart used for heart rate correlation and order seems a bit confusing. I feel like correlation should be on the Y axis as the independent variable, and the position on the X axis. This way, you could also have a bar chart where it's easier to compare how close/far in correlation each device is. Right now the vertical line makes it feel like their heights should be compared (given how we generally read graphs) but they're all linearly spaced because it represents the position and not the correlation. Hope that makes sense. 2. Would be very very interesting to plot some of these correlations/accuracy/performance with another variable on the other axis like Price. That way, we can see the price to performance correlation and if there are any positive or negative outliers when it comes to price. It looks like you always research the price and mention it so I feel like incorporating this into the visualization would be great :)

[@danishidqi]

Before testing, have you updated the mb9 firmware to the latest version because the previous version had many bugs? I like your YT channel, thank you.

[@-ross-7250]

❤ love the videos. Please do the Amazfit Trex 3 🙏🙏

[@MohammadEllepaikhan]

You’ve helped me a lot, thank you for your reviews. You’re the best.

[@TheQuantifiedScientist]

Happy to hear that!

[@mjhdfdnllh]

Hi Rob! I really love all your videos and always consider your reviews before buying any tracker. Maybe, you could add a review of the Suunto Race S? I’m super curious and thinking about getting one. I checked your channel, but didn’t see any reviews for this brand yet 🤔

[@MariaSilva-hq7fh]

We want the oura ring 4! 👋🏽

[@GorZic]

Great review! Please also test the Redmi Watch 5 Lite!

[@Francoargentin83]

Thanks for the hard work!

[@grundschul-mathe-profis2773]

Thank you very much for your videos. Are you planning another one for the Fenix 8?

[@herupujiraharjoraharjo6502]

I'm glad to watch your review soooo scientific. Rob, please review/ compare between huawei band 9 and Huawei watch fit se. Which is better?

[@asherdesilva7549]

This is a great review. I am considering getting the 9. Ive been using the Mi Band 5 for a few years and i love the form factor because i wear it on one wrist and a mechanical or digital watch on the other, and it doesn't look weird 😅 What would be a better option to the 9? Maybe priced slightly higher but looks similar.

[@DavidsOldChannel]

Thanks for the amazing video. I got it as a replacement for my Mi band 5 and mostly for sleep tracking but it was so way off even with my band 5, especially registering that I woke up many times for a long time during nights, that I just returned it. Felt like a complete waste of money.

[@Xearrik]

So what you're saying is if I want the Mi Band 9 to be as accurate as possible, I'll need to wear a wristband over it during the day to block out the light?

[@theotherleft6113]

Great review. Are you left handed by chance? You've done a few reviews with bands on both wrists. I wonder if your left wrist is more muscular/bigger leading to better sensor readings.

[@akhilgovekar2212]

Hey man, make a video on best smartwatch/band of 2024. Waiting for your review.

[@RavagerCP9]

Best reviews as always! Are you planning to test redmi watch 5 lite? seems to be interesting choice

[@BRSPro]

That sucks compared to Mi Band 9 since both are the same price & Redmi Watch 5 Iite offers more stuff at a budget price.

[@Legenwait4itdary]

can you test sleep as android combined with polar variety sense and how it compares to nukkuaa? Its free and would be the perfect setup!

[@ameerbarakat3499]

Thanks best reviewer

[@danielbures9553]

Would you recommend this over watches in the same price range? What is the best watch in this price range? Would it be the fitbit charge 5?

[@sharnshinex]

I’d love to see your 1 month later -apple watch 10 sleep test and usual. Thanks

[@juswa2380]

So off all of his videos the Mi band 9 has the one that has been tested outdoor yet? Still impressive and okayish for the mi band 9 considering its price. Awesome video Man.

[@jayshukla4926]

Great content however it will be great if you can include basic tests like step tracking accuracy, calorie burnt, active time etc...thanks.

[@alvipranks]

When it comes to fitness trackers sleep tracking is my priority I am using Mi band 7 and it is quite doing okay and I actually did a downgrade from band 8 to band 7 as I have given it to my father just because of the sleep tracking so which band would you recommend for better sleep accuracy please let me know

[@lior7373]

thank you for this review, please, can you dived the results of comparison with price range as well?

[@aculsch11]

Please review the Luna Ring!

[@mboiko]

"If you can", I would wait for the Fitbit Charge 6 to go on sale (I bought mine for $99) - as it's a far better device, as someone who has worked their way up through the Mi Band line over the years.

[@cindariel]

Weird how mi band is actually cheaper in europe than US

[@Androide323]

Hey there, do you have anything available that we can check for a detailed database of all the watches you've tested? Like the best watches for each category so we can make an easier choice when we buy...

[@reeceanderson9293]

Rob, what is the best sports watch for sleep tracking excluding Apple Watch?

[@utkarshpareek7838]

Hey Rob, I have a request-please let me know once you've read this. There's an Indian KZbinr named TechBurner who recently launched his own smartwatch after reviewing gadgets for over a decade. He claims that the watch’s UI and tracking capabilities are on par with Apple Watches, but it’s priced incredibly affordably-under $100. What’s even more impressive is that his team built the smartwatch entirely from scratch, showcasing the power of KZbin creators and their communities. If his claims are true and this watch is genuinely being sold at a low-profit margin compared to established brands, it could revolutionize the market and become a fantastic budget-friendly option. Could you please test this watch? I feel it has the potential to be a real game-changer!

[@joseluisdosreis8999]

Please release the Apple Watch video before Black Friday, I'm waiting for the video to decide whether to buy it or not

[@GauravYadav-9166]

Most quantified channel on youtube

[@OfirilFPV]

Will you do the Scientific test to the withings nove ? It’s looks like a nice smartwatch

[@EricA0321]

Have you looked in to the new HUWAEI WATCH D2 that monitors your dia and sys?

[@ermeriodsassperini]

When will you be doing a review on the oura ring 4?

[@mathiasjunnielsen]

And Ultrahuman and Ringconn!

[@kaynejk9629]

How would this compare to the Huawei band 9 ? Also I know the garmin vivosmart 5 is 2 years old .. it’s priced quite well right now.. similar range.. also any idea when the vivosmart 6 would be coming out ?

[@quiaudet3298]

The Huawei Band 9 is definitely much better. You can see the measurements for the Huawei Band 9 (left) in the diagrams. In most cases, the Huawei Band performs better. I personally own both devices, and while the Xiaomi has a faster CPU, better display, and more responsive touch, the Huawei Band has superior sensors and software that makes much more of your measurements than the Xiaomi Band. Additionally, the Huawei Band’s display can show more information with a well-sized, readable font, compared to the Xiaomi. The Xiaomi Band is fine and is a good choice if you want very simple software. The Huawei, on the other hand, is more complex, so it may not be ideal for users who aren’t ready to invest some time in learning the software.

[@kaynejk9629]

@ thank you my friend.. now is the universal version available anywhere ? Or just Chinese

[@DaniilDimitrov]

Why youtube did not notify me about this video upload 😢😢. Was waiting for weeks

[@TT-mb6rz]

Waiting your oura 3 vs oura 4 test 😊

[@mikoajdomanski8597]

Please make video about Athlytic app and how it compares to Whoop with for ex Apple Watch Ultra

[@shiftgamerex]

Hoping for you to get your hands on the Mi band 9 pro soon🙏🙏

[@Fthan]

Man this is sad because it looks good Love the design

[@AnthonyCasani]

Amazing review as always ❤, can you also review xiaomi redmi watch 5 lite? 🙏

[@z2zugzwang]

Great work...!!!

[@erwset]

Are you going to make a review of the Massimo W1 smartwatch or Massimo Freedom?

[@lyricsremix7884]

So the Huawei wearables are the best in the budget category, right?

[@talhasoylu898]

Which is better? Galaxy fit 3 vs mi band 9… i am so confused

[@nimarezaei3167]

If you have a Galaxy phone, I highly recommend the Fit3, as it is similar to watches.

[@NostalgicMem0ries]

galaxy fit 3 is way better, but dont match mi band battery life. i get 5 6 days at best. but hr is really accurate

[@j.l.6386]

I think wrist circumference can play a rol there, those bands are made for Chinese population which has a slim complexion, you could analyze it maybe in a female wrist? It would be interesting

[@marcopirulo1]

Gracias por aportar claridad saludos 🇺🇾🇺🇾🇺🇾

[@Labib-dw1lk]

When Will you retest the mi band 7 for sleep?

[@dieternaegele782]

I would be very interested in a scientific comparison of various apps such as Bevel or Atlythic on such things as recovery, VO2max, sleep and other parameters since I do get some significant differences and wondering where the „truth“ is.

[@sameerk1565]

Pls review galaxy watch 7 in detail once again

[@mikegoetzz]

OURA RING 4 review PLEASE!!

[@joseafonso5671]

Hello! I would like to present my recent feedback about HR monitoring with MiBand 9. During the day it measures just fine (working at my laptop, cooking, etc and even within intense periods like working out, the HR sensor works fine). However, at night, while I'm sitting/lying in the couch watching some TV, the band starts record values like 125-130bpm . When I manually start measure HR, it starts at 125-130bpm and after that goes down to 55-50-46bpm. In the next minute it's high again - and I still remained relaxed in the couch...Do you have any insight on how to avoid/correct this? I've already sent back the first one to the warranty - they said it was fine. I bought a new one, the problem remains...

[@intentohacerdetodo2612]

Can you please put in the description the scientific papers related to sleep quality pls. The thing is that I’m thinking on buying a garmin venu 2, because I really love its design and some other features that the garmin watches provides, like body battery. But after watching your video and seeing that essential features like sleep tracking (which was the main reason because I wanted it) were not so great. But I still wonder if those results were so bad because of your physiology or it is not a great watch for sleep tracking

[@TankTnT_]

When are you making a video on the new apple watch series 10 sleep tracking?

[@হরেকৃষ্ণ-ল১চ]

Which one will be better for health tracking and overall? Huawei Band 9 Mi band 9 Honor Band 9 ???😊

[@393Dima]

Huawai band8

[@t.agamingbd1996]

​@@393DimaHow bro?i will buy one too but i am confused

[@Blu3_777]

Question what's the importance of the heart rate accuracy and what does heart rate determine ?

[@alirizaunver]

Thank you. Can you review Oneplus watch 2R and Ticwatch Pro 5 please? I guess these are very competitive.

[@muhammadsyahidanuar9657]

Now choosing between this and the Huawei band 9 🤔

[@suhhhy9701]

Fenix 8 please!

[@movielover8548]

Sir! How you collect data for making graph? Manually or automatic?

[@اللهماهدناالصراطالمستقيم]

Please do a test to the huawei watch d2

[@LiveYoung0]

can you please get Ultrahuman Ring and compare to other sleep device? Since your testing and data is the best

[@nguyenthethinh7385]

Pls test huawei watch D2 and focus on testing blood pressure compare with clinic devices. Thanks

[@DanchyMT]

Would be interesting to test Redmi Band 5 Lite if they are using same sensors or not.

[@perfectlyaware2953]

Please review the new Huawei D2. It has blood pressure measure

[@unknownknowable]

Tested a Mi Band 8 Pro against a Pace 2/H10, it's similarly unpredictable. Walks for me were almost all wrong, 90bpm was 120 on the MiBand, likely cadence locked. Running outside can be good, even in cold weather, which is quite stunning. Usually comes like -1bpm compared to the H10, as the band has difficulties at the start somewhat. Some runs were horrific though, and the band just stuck at 220 or was -10, -20 bpm than the H10. Seems that it needs to be quite tight on the wrist, and for me at least, quite near the hand. Weight lifting generally bad, no spike detection as expected. Their app is horrible though. Seldomly updated and buggy. Oh, and the HR detection at rest is also bad. Especially for athletes with low RHR. You'll see figures like 120 bpm during the night or working at a desk, so the watch just makes up data when it cannot measure it.

[@houssamadnane271]

It seems like the huawei band 9 is better

[@eeumo_o]

That's right