Fitbit Sense 2 : Full Scientific Review

[@RochiTube]

Best comparation channel. You are always a point of reference when evaluating a new purchase. Keep it up. Greetings from Italy!

[@TheQuantifiedScientist]

Thank you very much!

[@chilodaone]

I just skipped everybody elses videos and went straight to this guy (Y)

[@Henfredemars]

Really impressed by your data collection! Not an easy task to collect and interpret a wide variety.

[@Pradeesh...13]

Thank you for Reviewing Fitbit Inspire 3 in your next video, i have been waiting for this review, for almost 2 months .

[@amykolarova1335]

Thanks for this. I specifically went for the Sense 2 vs the Pixel watch due to battery time. 😊I do find the EDA is fairly accurate at noting my stress/frustration times so would love to see at least an overview on this piece at some point in the future as it was the main reason I upgraded to the Sense 2 vs going with the Charge 5. As an android user- the two ecosystems that are robust would be Fitbit and Garmin. And while I would be fine for either of those- it seems that each has issues with various aspects for accuracy.

[@tonywhite5883]

Interesting and I agree but I thought I'd add my findings .. I have Versa 2, though have had a brace of older Fitbits over time as well as a Garmin Forerunner now. Also Apple Watch SE (original) .. I know .. a bit of a tart! From my personal experience and needs I find: Fitbit is great / best for general sleep and general wellness and the app is great though I refuse to pay for premium. Apple: WTF .. why 3 apps dudes - watch app then health app then fitness app .. come on .. this is just a mess? For fitness tracking (for me it's walking, running and some pool swimming) it's OK and better than Fitbit. For sleep .. come on .. tell the watch your sleep times? Really? Yeah the absolute accuracy for heart is great but it is general consistence of readings which for me is more important - to track progress though others may have a different view here. Great display and integrates very well with iPhone but laughable battery even with the new low power mode. Garmin: Poor display, but outdoors it is exceptional the post activity fitness tracking and suggestions for recovery etc is great. Excellent battery - we are talking more than a week with daily exercise GPS tracking and worn at night. Really poor sleep tracking though, but you don't have to tell it when you are about to sleep so there is that I guess. Finally the app is great and no pay wall. Fitbit & Garmin apps let you use you stuff on iOS & Android and swap over and still retain all your data. Apple? Well, it's Apple but I think you can export stuff to Strava??? So I guess this all comes down to what is important to you. For me right now though what is important is my coffee!

[@EliasAlucard]

Thanks for the review! I bought the Sense 2 recently, mostly because Fitbit trackers have had pretty good sleep tracking in your other reviews. I think Google can significantly improve the sleep tracking with an algorithm update for the Sense 2, and I hope they do if they watch your review. It's good to see that the Sense 2 is comparable with Whoop 3 and 4, and I've stopped using both Whoop 3 and 4 (I upgraded to Whoop 4 when it was new, but ditched it recently when I switched to Sense 2, as Whoop is pretty useless for anything other than sleep tracking, and since Sense 2 has about equally good sleep tracking as the Whoop 4, I see no reason to pay $30 per month when I get more and better data with the Sense 2). I hope the Sense 3 gets much better sleep tracking, and really, the Sense 2 could perform equally to the Apple watches with a firmware update. I also use the Garmin fenix 7X Sapphire Solar, and now I know better what I should sync to Google Fit between the two. Keep up the good work man!

[@innosanto]

Sense 2 is far better than apple watches in sleep tracking. Not just better maybe 2 levels better.

[@EliasAlucard]

@@innosanto what do you base that on?

[@kwinzman]

Can you do a review of a selection of blood pressure monitors? I know that it's not the typical heart rate tests that you usually do. But with over 200 different models on Geizhals and me not having any clue which one is good I would love if you could venture to testing blood pressure monitors as well.

[@gabbiesjoubert6197]

Hi, can you maybe review the new Huawei gt 3 se. Nobody has made a good review for it So can you PLEASE review it!!! You are my only reliable source/youtuber!!!!😊😊😊

[@5ervalkat192]

Great video, as always. I had been a dedicated Fitbit user since the Charge4, along with subsequent Charge 5, and Versa 3. I did try the Sense 2 for 1 month before returning it for a refund. The accuracy was just so poor, and the long battery life did not balance that out enough for me to keep it. I moved on to the Apple Watch SE 2022 and am very happy both with the accuracy, the sleep tracking and the exercise tracking. The 2 latter things are much improved with Apple's newest updates. I wouldn't have known to try this switch to a new brand without your channel, so thank you!

[@borisgurevich5504]

I have also been using fitbit, namely charge 2, for a long time, and wanted to replace it with charge 5 or one of the fitbit watches. But I am also leaning towards Apple Watch SE. Fitbit used to have the best sleep tracking but it appears to have been surpassed by apple watches. So the only advantages of fitbit are longer battery life and of course price, but with the obscene subscription model this goes out the window. Getting ready for Apple Watch SE and happy to see how good it performs in Rob's tests. Yes it is pricey but it has excellent accuracy in all departments (heart rate, steps, sleep) and by far the best iPhone integration.

[@xPowerShotx]

How is the app on apple, is it just this apple health? I feel that Fitbit have a very good overall app for suggestions and calculating things together to measure data and give you tips on how to improve. Does apple watch have any of that?

[@5ervalkat192]

@@xPowerShotx Not really. Apple excels in providing accurate data, which I like. But they do not offer much in the way of suggestions or interpretations. Apple Watches accept a bazillion third party apps such as Workoutdoors, Athlytic, and Heartwatch , etc) which try to fill that gap. But it’s irritating to pay extra for third party apps when Apple could offer interpretation themselves. I still do not regret my choice.

[@innosanto]

Sleep tracking of apple watch is complete joke. Fitbit is 2 levels better.

[@swagatgaikwad9463]

Used Fitbit Charge 3 for 4 years, pre-ordered Versa 4 and returned within 2 weeks in October this year - shockingly inaccurate HR tracking (very low HR when I'm clearly out of breath) during even the simplest exercises for a wrist-based tracker (indoor cycling, treadmill, elliptical). Forget about weight training. Bought Garmin Venu 2 after that and its my first Garmin - my god Garmin is miles ahead of Fitbit and Venu 2 is extremely accurate - can't believe why I didn'tget a Garmin earlier - almost 1-5 bpm from the equipment's HR monitor. Battery life of Venu 2 is superb and app is amazing. Would not recommend any Fitbit, its nowhere close to what other companies are doing.

[@prasantrawat6263]

Long awaited review

[@FrankCarillo44]

I bought the Sense 2 an now on day 10 on one charge an still have 20% more battery , im impressed with the battery probably get 12 days on one charge. I understand Apple an Samsung you have to charge everyday

[@Isfantasea]

Can you test Garmin Venu Sq 2? Thank you

[@fahlmancomputing8628]

What an amazing review video, everything I could have hoped for and more. Fantastic, many thanks!!!

[@MartinDeBruyn]

As always. Thank you ! Great review as usual 👍

[@TheQuantifiedScientist]

Glad you enjoyed it Martin!

[@fuxart1224]

Owning one, I hope the review is postive 😅 Thx anyway for your excellent work. Always a pleasure to watch your videos. You have potential to expand the channel btw

[@Nicval-tn6wr]

Thanks for the video, Rob! I was wondering if you have ever taught about testing Garmin or Suunto watches! Kind regards and I'm looking forward seeing the next video😋

[@GK-qc5ry]

Garmin Venu Sq 2 next please TQS!

[@bederhajali]

People waiting for the latest episode of their favorite tv show...me waiting for your reviews of products I'm gonna buy behind my wife's back :p God bless man. You are a gem.

[@jasoncayen]

Enjoying the detailed work. Regarding all charts and graphs it would be cool to be able to look them all over in 1 place. As I have watched many hours of video and still cannot decide.

[@helge7739]

Hi Rob, Thanks for the detailed review. Are you planning a full scientific review of the new polar ignite 3? Maybe this is an alternative to Fitbit....

[@alkoholisierterpfandsammle4205]

Wich smartwatch would you recommend if my main focus is on sleep tracking?

[@DawidChorabik]

Amazing statistical analysis Of measurements. Good work and very informative. The only question I still have is how close Polar (your golden standards) is to the lab measurements (reality).

[@lvickers966]

Thank you for this video! My Charge 4 recently broke, so i purchased a Sense 2 to replace it. Since I am a Peloton App user and my fitbit charge 4 would not connect to the fitbit app, i previously purchased a Scosche 24 so that i would generate a "strive score " on the Peloton app. I noted that the charge 4 (worn on my wrist) and the Scosche 24 (worn on opposite arm, above elbow) always generated same/close heart rate data. However, today when i used my sense 2 simultaneously with the Scosche, the Sense 2 was far off (on the low side).

[@tubejuanso]

Thanks, Rob. Great review, this watch is not for me. I hope you get to test soon the Huawei Watch D. If it really works I won't mind that's ugly, because a blood pressure monitor is a game changer in this format. BTW, I find your work so interesting since I'm doing a master's in Data Analysis, and everything I see in class you're doing it, just better. Thanks again.

[@setiasianturi]

best solution for hr issue is buy smartwatch that support Ant to be pair with polar chess strap.

[@DigiDriftZone]

I had the same thing with the Sense 1, it is what drove me to the Apple Watch after being a Fitbit user for like a decade! - it was showing shockingly inaccurate results and the battery life was barely 2 days.

[@qwertimus]

Genuinely same. With the Pixel Watch & Sense 2 being so inaccurate, and after being with Fitbit for 8 years, I switched to all-in on Apple Watch (& iPhone from Android). I was really hoping either Galaxy Watch 5 or Pixel Watch would finally compete against AW, but nope.

[@micahjohnson9184]

@@qwertimus It depends on what you want. It's pretty good if you want sleep tracking I have the inspire 2 which Rob is really positive about 2 weeks of battery life and great sleep tracking and the pixel watch isn't "really bad" it has pretty good heart rate tracking. It's just the price point and fitbit subscription but if that's not good enough I'm sure we could pair a polar h10 chest strap to it. A lot of us get caught up in thinking just because one thing is better the other is bad. But for an all in one tracker and smart watch Apple watch is great. How are you enjoying the apple ecosystem? I'm mainly an Android guy but I'm curious to know because I might give it a try.

[@TheQuantifiedScientist]

Thanks for all the feedback from everyone!😊

[@dragonemp727]

Lol, complain battery then you switch to apple watch which cannot even last full day.....

[@DigiDriftZone]

@@dragonemp727 True. I always bought Fitbit because I hated the Apple Watch battery life, still do. But the Sense 1 battery was 2 days with the always on display, Apple Watch was 1.5 days but for a literally night and day experience, it's like going from a rusty old bicycle into a Lamborghini, so that was a no brainer. With this said, that's the Sense, the Fitbit Inspire 2 is still a great device with 2 weeks battery, if only it was more accurate.

[@maxvatanenrally]

Waiting for the amazfit gtr4 review :)

[@oppi263]

Waiting for watch that can beat Apple

[@TheQuantifiedScientist]

Hi Max, I am wearing that one as we speak ;-)

[@maxvatanenrally]

@@TheQuantifiedScientist you're the best 💪!

[@dawidstar5092]

Hi. Proposition.....Polar Ignite 3 Test???😊😊😊

[@ScarecrowOZ81]

I can concur with the sense 2 showing too low a hr when not at rest. I wish I had known that info when I ordered it from Fitbit (late October). My versa 2 (got it Nov 2020) was usually spot on with my hr and was accurate with high hr. I wanted the ecg option for more heart health features, which is why I thought I was upgrading to the sense 2. 😢 I wanted to have better hr tracking for PSVT episodes. I guess I should have gotten the charge 5 instead. But didn't want to downsize in screen size from the versa 2. 🤦‍♀️

[@tiberiubadic8949]

Thanks for the review! Much appreciated.

[@sammyt3514]

Hoping the Inspire 3 review (which you mentioned you were working on) will be coming out soon; thinking of picking one up on Black Friday but waiting to check your review first. Thanks for all the good work!

[@mboiko]

Now it makes "sense" why a $300 Sense 2 has come down to $200 so quickly. Heart rate accuracy on the first test is R=0.87...while a $40 Mi Band 7 gets R=0.92...and its battery lasts for 7-10 days! The battery life on the new Pixel Watch is measured in hours!

[@roderick.t]

Awesome review Rob! I feel the Sense 2 is intentionally performing badly in order to promote the Pixel Watch.

[@잇비-l8s]

Hi rob, I watched this video from first point to final point without skipping haha. Your video is always best and amazing with all testing. And so much thank you for this video. I am happy your youtube channel is increasing everyday. and Keep going! Greeting from South Korea.

[@justshorts76]

Please Test Accuracy of mi watch s1

[@JonnyBezzy]

I literally bought this watch an hour ago. Looks like it's going to be returned. Thank you for the data

[@tomaszs5954]

Unfortunately, Fitbit stopped making progress from Versa and Sense point of view after Versa 2, to be polite. Missing functionality, no 3rd party apps and tiles changed to a list, and over-sensitive setup of time or options on the watch, and you can't turn off the screen witha button anymore. Not to mention other issues with, for example, setting up Fitbit/Google Pay. I bought Sense 2. It's a half-product and I wouldn't have it for free! It's so rubbish. If only I could have it with Versa 2 software, that would make it a great watch again. It doesn't feel like Fitbit do care anymore. If it doesn't change, Versa 2 is my last Fitbit product after 9 years of being a loyal user.

[@Pohmetolog]

Remember that you were a fitbit user not a google user. I am moving my entire family away from google since there is no more fitbit that we used to know.

[@littlevoice_11]

Have you tried a Samsung smart watch?

[@Pohmetolog]

@@littlevoice_11 my wife has a samsung she switched from Fitbit to Samsung

[@MARKELL00F]

Awesome review. Please make review for Amazfir GTR 4 and Huawei Watch GT 3 SE

[@Babak7712]

Great as always Would you please review Fitbit inspire 3 sleep tracking compared to inspire 2 ? Thank you 👍👍👍

[@rrnrj1]

very reliable channel and tests!! thanks!! when are you going to review the new Amazfit GTR 4?? 🙏

[@mrussoart]

great work Rob! So is it safe to say the heart rate of fitbit devices are getting worse from fitbit inspire 2 to sense?

[@RishabKapadia]

bro.. that's some serious testing. great work.

[@berto3328]

Suggestion: Kindly review the new fitbit inspire 3 and compare it to the old model thank you!

[@myst8217]

I've had the Charge 3 & 4 but I've been looking to upgrade between the Sense 2 or SE2. This video seems to be confirming all the bad reviews of the Sense 2. I wish Fitbit didn't sell out to Google

[@paolovaralda6797]

Seems that the charge 5 is more accurate than this in HR readings…and is a 2 year fitness tracker…

[@janfrey4967]

Such good reviews. Happy to click the affiliate links. :-)

[@joeya5147]

My sense 2 detects waaay too high of a heart rate. itll say im at peak for like 20 min

[@fauxstrider4018]

I am so impressed with the insight of conducted tests. Only German speaking nations are so precise and perfect at doing things.

[@wagnermoreira786]

fucking awesome to see a scientist with such an amazing channel!! fuck!!! Someone showing data you got a subscriber!!

[@HorrorMood]

I was about the pull the trigger on this one, and now I'm very glad I watched this first! Thanks a lot!

[@tuapuikia]

I bought a galaxy watch 5 because of wear os and google pay. The ECG is quite accurate 😁

[@MarcoPolo82]

How your battery life time?

[@tuapuikia]

@@MarcoPolo82 2 days max.

[@mikeybee98]

This makes me wonder how Fitbit themselves test their own devices for accuracy. Or do they basically just hope nobody finds out just how inaccurate their devices are. So many years gone by for Fitbit to improve and apple speeds past Fitbit easily and Fitbit has nothing to show for it.

[@Datcful]

Nice review, sad it is so bad :D But i guess in the future they come with some firmware updates like the older ones, so it get much better. I will cause of that maybe still buy it

[@Garciaformica]

Thank you for your video! It would be awesome if you could review the Amazfit GTS 4!

[@petersharp8432]

Am I missing something here ! Google acquired Fitbit in January 2021.

[@borisgurevich5504]

Hi Rob, yours are the best reviews of tracking devices on the planet. But I have one suggestion. When comparing correlation coefficients for different products, the x axis is correlation coefficient C and the y axis is… some function of C. Thus essentially the y axis is wasted. I suggest that you plot some other useful property on the y axis, which could be Amazon price or battery life. Price in particular would help peopLe see which trackers give the best value for money. What do you think? Cheers.

[@harsha1306]

I have a charge 5 and I've been looking to replace it but none of the offerings from Google or Fitbit don't seem like enough of an upgrade over the charge 5. Guess I can save that money for next year

[@bearclaire]

Anyone that can suggest what tracker to buy? Good Step tracking, sleep, heart rate etc. I don't own an apple phone.

[@sherbazh]

A comprehensive review of BodyPedia would be amazing, it seems too good to be true

[@ildefonsodelrosario5678]

Should compare effectivity of watch with the same price range. Comparing this watch with Apple or Samsung smart watch may not be fair. Apple maybe the best but not all can afford it.

[@JudgeFredd]

Great in depth video ! tx !

[@pedroaires]

Great as always. Would you review the xiaomi band 7 pro?

[@varunchauhan7267]

Hi, will you be doing a review of the Amazfit band 7 ? how is the HR & sleep tracking? Also should I wait for FItbit Charge 6 or it will take time for launch & settle for the Fitbit charge

[@christopherscarlett7301]

Fantastic review! Would you recommend the Sense 2 or the Charge 5

[@innosanto]

They are both great

[@Eyes_In_Your_Darkness]

I’m pretty sure that one company has paid you to destroy the credibility of this watch. Your information differs from other sources that have tried and tested this watch

[@aksty]

Thanks for the review ! Is Fitbit versa 3 / Fitbit sense 2 better than amazfit GTR 4?

[@TheAngelChristine]

which watch has the most accurate heart rate accuracy? of all of them?

[@matteodanese]

why why fitbit don't introduced airplane mode to turn off bluetooth?

[@martalli]

When heart rate is sketchy, I always under if the watch can accept a heart rate belt. I have long felt that Garmins' secret strength is their ability to use sensor of so many types, like belts, cadence sensors, and so on. Can fitbits do any of this?

[@Eyes_In_Your_Darkness]

So how come it’s allowed to be sold on the UK market if it’s low performing

[@packfan678]

Since it doesn't track higher heart rates as well, does that mean it underestimates calorie burn?

[@BGforever420]

Hey Rob, you said apple watches to iphone and huawei for android but how will work an apple watch on an android device?

[@yildiraykomurcu]

It is very poor that after two years, Fitbit couldn't come up with a better device. Still struggling to deliver reliable health info. I hope Google will make further investments on this area and they will improve their wearables. Huawei silently released GT 3 SE. I am not excited about the device. But it is the first device that Huawei is using their new sleep tracking algorithm, i.e. TruSleep™ 3.0. Huawei solved heart rate tracking, I wonder what they have come up with sleep tracking. Their previous algorithm was garbage. To sum up, Apple solved both heart rate and sleep tracking and Huawei solved heart rate tracking. When saying solved, I mean they achieved almost medical accuracy. All the other companies are selling their devices with placebo effect. Their devices have excellent (!) sensors and algorithms (!) to track your health. Only if keep believing so.

[@Lanky009]

they should be forced to provide tests like this video, most are inaccurate enough to provide zero value

[@jarelel7919]

Hey rob! Are you going to do a review on the versa4? I'm looking to buy a smartwatch on Black Friday (although in my country is more like a Black Frauday)

[@AIejandroide]

Please test Amazfit GTR 4!

[@Juanjo191]

Mmm not quite sure about the performance of the Sense 2. I’ll wait for other reviews to get my first fitness tracker

[@Haarism0d]

I like the scientific rigor of your reviews. can you please please do continuous glucose monitors (cgms)

[@bearclaire]

Yes would be interested in this as well!

[@drjp01]

I admire you.

[@pulkitchanana]

Could you review the Amazfit GTS/R 4 and see if they have improved on their supremely inaccurate tracking? It's been a while since they launched.

[@stevenpwilliams]

Have you done a text of multiple H10s to see how they correlate? I actually just saw this about 24 hours after getting my new Sense 2...

[@triparadox.c]

Hello, I would like to leave a video suggestion here: Your work is amazing since you review product objectively based on accuracy of their features. However, measuring heart rate accuracy is but one small aspect of smartwatch experience. Often, these companies ship a software product (i.e. Apple Health, Samsung Health, Zepp Life, etc) that pairs with their own products and become consumer's primary health app. However, from my experience with Samsung specifically, despite having heart rate monitor and software capable of integrating that data and displaying it on your exercise history, it does not use that information to calculate estimated Calories burn. Meaning, regardless of accuracy, it's completely pointless. You can test this by wearing the watch, starting a workout mode, and sitting idly. You will notice the app tracks your Calorie burn at the exact same pace as if you were rigorously training. My suggestion is for you to help us discover which health app (manufacturer proprietary app or third party) that incorporates heart rate to calculate Calories burn. Argument why this matters: inaccuracy aside, people can still reasonably estimate their Calories expenditure if the calculation is predictable (i.e. due to inaccuracy, expect 20% less reported Calories burn than actual). However, if a software outright exclude heart rate from equation, the data becomes completely useless.

[@cevxj]

Can you test if wearing wrist based sensors perform better or worse: on the underside of the wrist, higher and lower on the forearm?

[@chrissydee4384]

Would IT be correct to assume, that also the resting Heartrate wont be acurate or are that two completely incomparable Things?

[@MarcoPolo82]

What TWS did you used on the video during the spinning?

[@explorewithmai]

how about amazfit gts 4 mini

[@bearclaire]

I'm thinking to get a tracker if there a good black Friday deal. Would you say I can better go for the charge 5 or is the huwaei fit 2 better ? Or the sense 1 or 2? Would greatly appreciate your input as you have a better idea which is the better option to go for. Or another? I don't have an apple phone tho, so an apple watch is not possible

[@theunknownsamurai7426]

where would the Garmin 955 be on the the list?

[@navygirl54]

My question when you counted the steps did you go to the website and input your stride length?

[@tayanothertryanither7968]

How do you get the Sense 2 to show your sleep stages like in the thumbnail of this video? Thank you.

[@keshavbhatnagar197]

Hey Rob, do you think the Fitbit you tested could be a defective item? It's hard for me to believe that the heart rate tracking is so poor. Would be great if you can test with another Fitbit sense 2 or get data from another user to confirm the results!

[@mboiko]

We'll find out when he tests the latest Versa 4...

[@davidshapiro7227]

No it's not. I also have a Polar H10 and the sense 2 accuracy is as bad as his testing indicates. He essentially confirmed what I was seeing. The more vigorous the exercise, the greater the deviation of the sense 2 from reality. I've already returned mine.

[@steveweinberg462]

Based upon some now deleted threads on the Fitbit forum this is typical.

[@mboiko]

@@steveweinberg462 I bet this is one reason why they so quickly dropped the price from $300 to $200

[@davidshapiro8092]

@@steveweinberg462 That forum is heavily censored by the mods in a sad attempt to make the Sense2 seem like an accurate fitness tracker and 'smart' watch. The sad part is that virtually every new post is either an obvious shill or an actual complaint about missing or inaccurate apps causing the Sense2 to seem horrible regardless. I deleted my account after I shared the observation that, given the $300 many people were paying for a fitness company's "flagship product" with such a high rate of missing or grossly inaccurate features, Google/Fitbit could be at risk of a class action suit for fraud in dumping excessive inventory of a defective product - which was promptly deleted. A general search of Sense2 reviews now brings up many shills that make the $300 list price seem like a bargain.

[@kristof9497]

Thank you.

[@paolovaralda6797]

Just try an hard reset on the device…dunno why but the Hr is much much better

[@X-VoodooKing-X]

I wish the Pixel watch worked on IOS, I would have gotten it.

[@OllieGilbey]

Can you add Sequent watches to your data and videos please! Really interested to see how they fair!

[@antonmaier2263]

couldnt you use spo2 measurements to estimate vo2max?

[@paulmiddler3382]

I do think your videos under estimate the importance of battery life. Usability is lowered if you're always tethered to the charger.

[@masterchief5437]

My sense 2 keeps coming up with the logo every minute some weird firmware upgrades

[@TheXptop]

Hi Rob, can you perform a scientific review of Coros Pace 2?

[@francobellomo9979]

I understand Fitbit less and less and less reasons to buy one, bad HR sensors and it has a subscription... Better to buy a Garmin F255 or Apple Watch 8

[@deanwilson1562]

Wow this is quite the disappointment. Glad I got the pixel watch and not this.

[@awesomebrotherhood7698]

Pixel water is much better for Android. I think it is one of the best