Fitbit Sense Accuracy (Sleep, Step counting, Heart Rate)

[@bodhisattyaroy4015]

I am so happy that there are youtubers going beyond 'I like this, I hate that' kinda reviews, and are actually willing to put some rigor into their analysis. Kudos

[@etiennelajoie450]

I am very impressed on how you tested the watches and even more impressed on how many watches your wear while sleeping! Very good video!

[@robertrose3068]

After a few hours of looking around, I FINALLY found a video with REAL data comparisons. Sharing this link on my Amazon review when I buy.

[@robertrose3068]

By the way-my Fitbit Sense arrives tomorrow. 👍 And reimbursed thru my FSA.

[@ericfranklin1802]

As someone who also spent tons of years of my life doing scientific research (cellular/medical biochemistry) I really appreciate the approach you've taken on these evaluations!

[@grim789]

Finally a real scientific breakdown 🙌. Got a sub from me.

[@glenvest5256]

Great review, Rob ! As a Fitbit wearer of many years who's interested in the Sense (and is currently wearing a Charge 3), and as a stats teacher (of many more years!!!), your vid review was of great interest to me. VERY cool to see comparisons to multiple Fitbits as well as more "scientific" devices, and great data analysis. I'm intrigued that your overall impression of the Sense was positive, even as I've read multiple online reviews that were, ummm, "less optimistic" and less positive. I'm looking forward to your follow-ups with the Sense !

[@TheQuantifiedScientist]

Thanks Glen! Stay tuned!

[@nsevv]

Fitbit are terrible just look at all the complaints on their forums and reviews on their google play store. Fitbit also charge a premium fee to access info that is free on other watches. Most stuff is hidden behind paywall. SpO2 takes 4 hrs to generate and only after sleeping, ECG is only available in PDF. No dark theme on app. Screen scratches easily. Random restarts. Weird button placement.

[@moeyhamka801]

Don't usually like or comment on videos, but wow what a video, I've watched about 10 reviews and none have given solid answers. The science shows the pros and cons and that's perfect. Legend for making this content bro.

[@gebkasxpx]

I have big interest in sleep test. You are a really great youtuber. Thank you.

[@boibluex12]

He should get more subs, I found this guy through data. I do care about data and accuracy!

[@TheQuantifiedScientist]

Thank you so much! 😃

[@caliga4998]

Please review huawei watch D cause it is a certified medically graded watch and it would be nice to see how accurate it is. You are my most trusted reviewer when it comes to smart watches and I am so thankful to people like you for helping out normal people like me that is not medically knowledgable.

[@ItsTheSidJ]

I was absolutely waiting for this video. Look forward to the rest of the review and more tests of the Fitbit Sense 🙂

[@debbielande355]

Thank you for going through all the trouble to do this study! I truly appreciate it.

[@TheQuantifiedScientist]

Thanks for taking the effort to comment Debbie, it is really appreciated 😊

[@afilizzola5500]

This is some great stuff man! It's actually the kind of tests and data I was looking for. Subscribed!

[@TheQuantifiedScientist]

Thanks Arier!

[@AlexLuo-y7z]

​@@TheQuantifiedScientistcan you test oppo watch3 pro？thanks very much❤❤❤❤❤

[@TheQuantifiedScientist]

*Subscribe to my weekly Newsletter(!)* on www.robterhorst.com Instagram: instagram.com/quantified_scientist/ Twitter: @QuantifiedRob 👇Amazon Affiliate links, support the channel!👇 Fitbit Sense: geni.us/CSfYQE8 Of course, only buy it if it makes sense for you!👍

[@brianneholzendorf8227]

I will do so. I'm currently on a hiatus from social media, but will remember you when I come back. :) Take care!

[@amarshinde4404]

Hey...thanks for the video....could you please do a comparison video between apple series 6 watch vs fitbit sense.....as fitbit has also updated the OS 5.0 to fitbit sense...so would love to see what the new OS brings to the table.

[@andrewlancefield3730]

Can you test again now the new OS 5.1 is out and see if the HR issue is fixed ? I really wanted this tracker please

[@EisOnDice]

Nice detailed review. Looking forward for a deeper and longer data review

[@TheQuantifiedScientist]

More to come! Thanks Christian!

[@hemabe]

Amazing, how much work you put into this. The 360 plus and 0 (zero!) minus votes are well deserved!

[@TheQuantifiedScientist]

Thanks so much Hermann-Marcus!

[@coffeenciggy]

I subscribed to your channel from the first two videos I came across. I trained as a scientist so your scientific measurements literally manna from heaven. Finally, no more heresay bro science and inaccurate claims from vendors for tracking watches!!!! THANK YOU! I intend to share your videos for the wonderful lode of data you are kindly sharing with everyone 😍

[@TheQuantifiedScientist]

Wow, thank you!

[@CFL-TECH]

Very good testing. Would like to see more of the Sense being put through the paces.

[@BrodeOne]

Amazing test, just want to mention the EKG is available now. subbed

[@KorraMea]

Thank you for doing these vids, I'm dealing with some potential afib symptoms and while waiting for the results from the zio patch heart monitor, I've been looking into these ECG watches. Can't wait to see your review on the ECG feature on the fitbit sense. Your comparisons and accuracy tests are very helpful and I appreciate the time you put into reviewing these products.

[@TheQuantifiedScientist]

Thanks so much!

[@jeffzest8393]

I take it you know about Alivecor?

[@AM-po3fz]

Hi Rob, thank you for such a very detailed review. However, I got concerned about some articles and reviews I read concerning about smart bands emitting EMF and how it can be harmful for our health. I hope you can make a separate video/review for that. Thank you and looking forward to more awesome and informative contents from your channel. 😊

[@honeybadger9425]

That is total rubbish tbh they dont give off anymore EMF than any other household device if it was a problem we would all be dead already lol Such minimal numbers not going to effect you microwaves and things give off much higher doses etc. About 50ut when i tested the Sense you get more than that all over the place just walking around all day.

[@robertduclayan2298]

You sir earned my respect. New subscriber here.

[@TheQuantifiedScientist]

Welcome aboard! Thanks Robert!

[@francisb1]

I hit like first, then watch the video. Great channel

[@TheQuantifiedScientist]

Thanks Francesco!

[@coffeeisthebestdrink]

YO THIS GUY TAKING THINGS TO THE NEXT LEVEL TESTING THE SENSE

[@ThiyaguShanmugam]

Your testing method is the most correct way of testing(scientific way). The other usual youtubers test by comparing with Apple watch as they all somehow assume that Apple watch is accurate watch seeing it's expensive price.

[@TheNightSkyGuy]

Very much appreciate your review and look forward to you diving in even more.

[@ChristofferEngelbrektsson]

I love your thoroughness!

[@ronsmith2241]

I appreciated you scientific assessments before I decided to buy the Sense. It helps cut through the sales hype. Thank you. The earlier FitBits were not reliable when doing heart rate. This is the main reason I bought it originally as I have had 2 heart valve replacements and monitoring my heart rate accurately is v important. The earlier Charge said my heart rate was 136 but when I counted it with the clock on my iphone it was 82.

[@bradz9413]

Hey man. Going to choose this over the iwatch. Sleep monitoring is most important to me. Cheers

[@nsaiswatching]

but the sleep tracking is off.

[@panagiotismourtzis7638]

Great video Rob!

[@platinum2t6]

This was an impressively good and thorough video. For the step counting portion wish there was mention if the devices were calibrated in the app for dominant and non-dominant wrist for a more complete idea of the left vs right discrepancies

[@TheQuantifiedScientist]

Thanks for the suggestion! Will try to do next time. FYI: I had all devices calibrated to non-dominant, since I wasn't doing much anything different with my right and left hand (i.e. nothing which required my dominant hand more than my non-dominant), and switching during the test was impractical due to the number of accounts associated with these fitbits. For daily life you for sure want a match between the setting and the arm it is worn on (since Fitbit reduces sensitivity when setting to dominant to prevent false positives). Hope it answers your question! Have a great day!

[@keshavbhatnagar197]

Would love to see a review for the sense 2! I've been waiting for you to post it since I pre-ordered the sense 2 based on your videos and the general accuracy of Fitbit watches :)

[@fauxstrider4018]

I appreciate you in-depth concise videos.

[@silviui.]

Awesome! Looking forward to the next video! Keep up the good work!

[@TheQuantifiedScientist]

Thanks! Will do Silviu!

[@terrygujjar999]

Very impressive testing done by you Doc! Subscribing you immediately!!

[@gator966]

Thank for this, I now know that I am going to stick with my current ionic!

[@danielwinn7417]

Very impressive. Everything was determined by testing rather than opinions

[@residentCJ]

Great Content 👍 I'm very excited what the exact Heartratemonitoring comparisons will bring. 🤔 The Heartrate chart in the video was so lala 😅 One idea from me would be: I know you are a fitbit man but instead of comparing 4 older Generations Fitbit Bands it would be nice instead to bring 1 or 2 popular Manufacturers in the mix. Maybe Samsung+Xiaomi 😉😉 Sure its nice for people with charge 1 to see its still good but i think if somebody is concerned about accuracy he will update his fitnesstracker regularly with a new one. In the end each manufacturer has its programming team and they wouldnt completely dismiss their measuring-codec over the generations. Instead they are finetuning, so the sleepmeasuring results werent suprising .

[@extendedp1]

Thanks for the video! Also I like your record collection:)

[@Hellosirrrr]

Great channel...Greetings from 🇮🇹

[@TheQuantifiedScientist]

Thank you very much Giacomo!! Greeting back from Austria!

[@MrMengaa]

Best review by light year away than others

[@johnmartinmoore1]

It appears the difference reading of deep sleep rely heavily on movement detection, so while you are wearing the charge 2 on one wrist and the sense on the other you're will see different reading because the arms move independently.

[@raysears5439]

Love the content, keep up the good work :)

[@TheQuantifiedScientist]

Thanks, will do! Have a great day Ray!

[@davebrown5223]

Well done. Finally a study with some solid unbiased content. Thanks.

[@LeinonenHannu]

Rob, do you have a link to published article you wrote about wearables?

[@quirinus_online]

bedankt man, geweldig hoe je de testen doet. hopelijk ga je ook nog de mi band 5 een keer doen.

[@TheQuantifiedScientist]

Thanks man! Ik ben inderdaad van plan ook de meer "budget"-vriendelijke Smartwatches te testen :-) . Mooie dag gewenst!

[@malignanz]

Unfortunately, I had the feeling that the watch, especially during runs, was rather inaccurate. Not only does it feel like the heart rate values are too high, but the values are also updating very slowly. Thank you for the great video. Now I believe in my Sense a little more.

[@justinomnia5518]

Impressive and thorough video. Great job!

[@ellisteel7793]

I have a Fitbit Sense and the face came off in August 2021, 10 months later the replacement did the same thing. I never get it wet, I do sleep with it on for sleep tracking and such. Fitbit said they will give me 35% off on a third watch, will not replace it. I have owned many watches from this company but I will never own another one again!! Starting my search for a new fitness tracker!

[@SaintVader]

Dude you are amazing! Great videos!! Subscribed!

[@tsitalon1]

Please test the Garmin Venue SQ.

[@kelalamusic9258]

Much mahalo. I will be receiving mine in the mail today. Can’t wait. 😊

[@daveninjaneuro7089]

I would love a review of the sense vs ionic. It would be a very popular video if you did in-depth accuracy testing sir!

[@fujihobo]

Fantastic review as usual. 👍❤️

[@paulmaloney2525]

The HR AND SPO2 sensor accuracy seems to be varying online. I was going to go with the sense but now verging towards the Apple watch 6 as it seems to be very accurate. I really enjoy your video as they are very objective compared to just a personal review from a reviewer. I’d love to hear your thoughts on the Apple Watch 6

[@jABSOCFuNk]

Apple Watch 6 is to over priced I have IPhone 11 Pro Max with Fitbit versa 3 and it’s the best investment

[@paulmaloney2525]

@@jABSOCFuNk sense appears to be very inaccurate with HR whereas the Apple Watch 6 heart rate sensor and SPO2 seems to be pretty accurate.

[@jABSOCFuNk]

@@paulmaloney2525 Yeahh I agree but still to pricey and remember I wasn’t talking about the sense I said the Fitbit versa 3 but at the end it’s up to you 💪🙏🏼

[@HappyHomeWorkchannel]

Hi Rob.y fitbit inspire showa around 500 steps even when I am sleeping. Do you have any idea how to fix that?

[@strawken2659]

Thank you for this insightful review, very in-depth.

[@TheQuantifiedScientist]

You are very welcome! Have a great day😊

[@besim109AOG]

Apple watch 6 / vs samsung active 2 / fitbit sense / garmin vivoactive 4 would be the ultimate comparison of sleeptracking smartwatches

[@anastasiiaperov6495]

Brilliant review! Thank you!

[@wst1384]

Thank you so much for your work!

[@syedalam6363]

best of all videos! big thanks

[@TheQuantifiedScientist]

So nice of you, thanks Syed!

[@matthewcopeland2732]

As a software engineer, I really appreciate this and you have a new sub. The review you did on the Fitbit Charge 4 had differing quantifications than presented in this video. In the Charge 4 confusion matrix, the columns did not add up to 100%, whereas in this video they did. Please excuse my ignorance, but is that what you present in this video not a confusion matrix? Is a confusion matrix only possible with a large data set? Is it impossible to compare to Charge 4 72% rating until you get a larger data set? The main reason I ask is because the Charge 4 is $100 vs $335 for the Sense, and my main interest is in the accuracy of the sleep measurements. Thanks again!

[@iphadkegmail]

Love your factual and analytical approach! Could you do a test between Sense and Galaxy Watch 3?

[@brucelin5842]

I also want to know

[@ayala500]

Amazing review and work, please can you review Air quality monitors next? I was looking for something like that but I trust no one without a scientific backgrounds or a proper test methodology like yours.

[@ohplezz]

Really love your videos!!!

[@TheQuantifiedScientist]

Thank you so much!!

[@doodica193]

Loved this!!

[@TongerFurther]

Can you test Fitbit Premium in Health Metrics have Oxygen Saturation (SpO2)?

[@pierrebreuls1756]

Hey Rob, Great videos and even greater research! Question: when are you following up with tests on the new sensors accuracy? I am considering buying now, but would love to see your additional findings before I buy... Keep up the good work! Greetz, Pierre

[@MyraSletson]

Hi Quantified Scientist. Thank you so much for all this research. So I have a Sense. And my non quantifiable experience with it agrees with your findings in general. But there is one issue I'd wish you'd address. I notice that the SENSE measures different heart rates, very different, at the exact SAME times, when you compare the heart rate measured in the Sleep Function, in the Heart Rate Function, and in the Zone minutes function. So for example, I could be exercising, and in the exercise function at 1:02, Heart Rate would show at 135, while in the Heart Rate function in 1:02 it would show as 115. Same thing happens in the sleep function. Can this be explained? Thank you.

[@vincentkwek]

Thanks for your comprehensive tests. Looking forward to testing for the Apple Watch Series 6 or SE if you can too.

[@rwf1449]

Hi you should review the phillips smart sleep deep sleep headband. Even if you don't meet the criteria you could review how accurate it is in tracking the sleep stages. I think it might be the most accurate device

[@cpasupala]

Dear TQS Thanks for the review. Will keep watching for more reviews of sense and scan watch.. And a one on one comparison between the two if possible

[@TheQuantifiedScientist]

My pleasure 😊 . Stay tuned for more Chaitanya!!

[@Monsieur-Karim]

Happy new year and many thanks from France for this deep review 👍 Just a comment about that Fitbit asks for a expensive premium account to provide some data...

[@Pavlos.Pavlou]

@The Quantified Scientist After 8 months of use there is some Pros and Cons. Pros are Excellent Recording my Sleep Stages. Cons are that still today ECG is not Available in Greece. I want to Buy a New Health Watch that be ECG Available in Greece. What is my options for Health Watch with ECG ?

[@rhdsyay]

Apple Watch maybe

[@pokiri3]

Thanks for the video! Do you plan to test the Versa 3 in a similar way? Or do you think versa 3 will have similar accuracy as the Fitbit sense on the sensors that are common?

[@wouter7699]

Hey do you have a video of the Fitbit Versa 3?

[@petepenno4552]

Up vote

[@joshd265]

Amazing data in your videos!

[@solidslk]

They released an update for Fitbit today in US. Can we get an update video?

[@MrBobbyArcher]

Hey man, I love these videos, they’re so informative. Do you have any plans to review the sleep cycle app? Not the Apple Watch one but the one that just uses the microphone on your phone to listen for breathing rate. It seems like it has comparable results to smartwatches but would be really interested to see how it stacks up! Means not having to buy something new to wear in bed

[@TheSpecial43004]

Hi Rob! As a data scientist, I really appreciate your scientific approach and the comparisons! Also, I'm quite interested in the Ultrahuman Ring Air, as it has no subscription fees compared to Oura, is it something you would also be reviewing in the future? I would probably not buy any wearable and blindly believe the data without watching the tests from you. Thanks for the great content ^^

[@m-618]

Thank you, excellent stuff, as always👍

[@brianneholzendorf8227]

"In the end I hope to use tracking to improve my life." Oh, have you got yourself a new follower! I suspected you were for me when I saw early in the video the image of you, in bed, wearing all. those. trackers. (!) :D I'm a health-conscious individual. I enjoy being able to track my- well, my everything. ;) I'm an avid meditator, so am looking forward to the experience of tracking my "stress" now, as well! :D I appreciate this video from the bottom of my enormous heart! Looking forward to more techy content, and THANKS for a day-brightening review! God Bless!

[@TebTengri]

I go to the US Thursday and will be getting mine as an upgrade from the Ionic.

[@apocabike]

1:50 made me laugh so hard with all of those devices strapped to him while sleeping. This guy is dedicated!!

[@jennalesca]

Any thoughts on Garmin Venu 2 vs Fitbit Sense 2? 🙂

[@andorandor5310]

What about the battery ?

[@nsaiswatching]

Why is the HR accuracy test not as comprehensive as with other devices?

[@irmadisimone2963]

im confused the auto feature sets my stride length to 75 cm based on my 511 47 age male i walk 15.1 feet in 10 steps giving me a stride length of aprox 46 cm ?

[@nil1874]

So which u would buy for accuracy... the sense or the scanwatch? :) lmk

[@residentCJ]

Apple Watch or Garmin Fenix 5/6. Idk about scanwatch, but in this vid the Sense looks way off the HeartBelt. Apple watch is nearly 98% the same as HeartBelt. kzbin.info/www/bejne/b5TPcoR6fpqZopI

[@korkoo1]

Love your videos, think your stuff is another level... have you had ever considered doing a test on oneplus watch?

[@beans2222]

How did you access the raw data for temperatures!? That's the only reason I got the Sense, to get my temperature, after 3 days I figure out they never actually give you your temperature!!! They just say 2 degrees more than yesterday etc. I need the actual number temp!!

[@TheQuantifiedScientist]

Hi! So if you request a full data export from Fitbit this will be included. However, these are skin temperatures and device temperatures and not your core temperature. Though, you might be able to estimate your body core temperature if you also measure your internal temp for a while at the same time(?). Hope this helps!

[@Chase_Anderson]

Really enjoy all your videos, would love to see Apple and Garmin thrown into the mix.

[@boibluex12]

Finally good job

[@TheQuantifiedScientist]

Thanks William!

[@inamdarswapneel11]

Damn ! Another awesome video...!! Would love to watch Muse S headband( marketed as personal eeg) vs actual professional eeg device comparison when you get hands on it.

[@ReemaQ273]

Amazing review!

[@TheQuantifiedScientist]

Thanks!

[@Zephiros92]

Hi! Very interesting review as usual! Have you compared the sleep data with the oura ring that you usually wear? I'll interested to have your feedbacks to understand if the Fitbit Sense is beeter then Oura ring or not. Thanks!

[@Spandex08]

I want to know where to buy that portable eeg

[@ScientistInvests]

Thanks Man! I was interested to see how accurate and reliable ECG on Fitbit Sense, can you do a follow up on this? Thanks again!

[@Pavlos.Pavlou]

@The Quantified Scientist I have order Fitbit Sense, 2 weeks ago and this days i am waiting to receive mine. I order it Lunar White / Soft Gold / Stainless Steel. :)

[@sinemhazel]

How have you found it to be?

[@Pavlos.Pavlou]

​@@sinemhazel After 8 months of use there is some Pros and Cons. Pros are Excellent Recording my Sleep Stages. Cons are that still today ECG is not Available in Greece. I want to Buy a New Health Watch that be ECG Available in Greece. What is my options for Health Watch with ECG ?

[@1994Amaral]

Great reviews man, queep it up! Could you also review some Samsung products, like the active 2 watch?

[@sourabhenglish]

Hi rob , Many thanks for making such useful videos , can you please do a video with Apple series 6 with latest sleep tracking apps and compare that to fit bit sense or Versa 3. As Apple ios 7 app does not give much details on sleep cycles like rem, deep etc , there are third party apps you may have to use . If you can do that than it will be really helpful as I am struggling to decide which watch is good between apple series 6 and Fitbit sense /Versa 3 . Fitbit sense or Versa 3 are pretty much identical , so if you just pick one watch between these two than it will be very useful .

[@jogo00000]

Your review was excellent. Can you please do one for the galaxy watch 3. I am really interested in the sensors and their accuracy. Thank you, keep up the extraordinary work.