Fitbit Sense Advanced Smartwatch with Tools for Heart Health, Stress Management & Skin Temperature Trends, Carbon/Graphite, One

(10 customer reviews)


Brand Fitbit
Model Name Sense
Style Modern
Color Carbon/Graphite
Screen Size 1.58 Inches
Special Feature Time Display, Alarm Clock,GPS,Notifications,Heart Rate Monitor,Sleep Monitor, ECG, Heart Rate Monitor, Stress Tracking See more
Shape Square
Age Range (Description) Adult
Compatible Devices Smartphone
Compatible Phone Models Apple iPhone 6 Plus

  • EDA Scan app detects electrodermal activity which may indicate your body’s response to stress and a built-in skin temperature sensor logs yours each night so you can see when it varies.Band Size : Small : Fits wrist 140mm – 180mm in circumference. Large : Fits wrist 180mm – 220mm in circumference
  • Assess your heart for atrial fibrillation –a heart rhythm irregularity- and easily share results with your doctor (The Fitbit ECG app is only available in select countries. Not intended for use by people under 22 years old.Operating temperature: 14° to 113°F
  • An on-wrist skin temperature sensor tracks yours each night so you can see how it varies. You can also see your nightly blood oxygen levels at a glance with our collection of clock faces.Maximum operating altitude: 28,000ft
  • High & low heart rate notifications alert you if yours seems above or below your average
  • Battery lasts 6 plus days plus, fast charging gives you a full day’s charge in just 12 minutes (Varies with use and other factors; up to 12 hours with continuous GPS)
  • Use built-in GPS during runs, hikes, rides and more to see pace & distance without your phone and use the built-in mic and speaker to take Bluetooth calls hands-free when your phone is nearby (Requires more frequent charging)
  • Use Google Assistant or Amazon Alexa Built-in to get quick news, set bedtime reminders and alarms, control your smart home devices and more just by speaking to your watch


Meet Fitbit Sense—the advanced health smartwatch that helps you tune in to your body and guides you toward better health. Assess your heart for AFib right from your wrist, detect and manage stress, better understand your sleep quality and even keep an eye on patterns in your skin temperature or well-being with SpO2. Plus, Sense unlocks a 6-month free trial of personalized guidance and advanced insights for new Fitbit Premium users.

From the manufacturer

fitbit sense

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Fitbit Sense

two fitbit sense smartwatches on a black gradient background

Important information


Cough, Cold

Legal Disclaimer

Statements regarding dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease or health condition.

Additional information

Weight 1.06 kg
Dimensions 1.59 × 1.59 × 0.49 cm
Product Dimensions

1.59 x 1.59 x 0.49 inches; 1.06 Ounces

Item model number





1 Lithium Polymer batteries required. included

Date First Available

August 25 2020




Fitbit Inc

10 reviews for Fitbit Sense Advanced Smartwatch with Tools for Heart Health, Stress Management & Skin Temperature Trends, Carbon/Graphite, One

  1. Sarasyn

    Not a smart watch, definitely a tracker, but exactly what I needed.Let me first say that I am not a smart watch person. I had the Samsung Watch before and absolutely hated it. I was very resistant to switch from my faithful Charge 3 to a new device that seemed similar to a smart watch, especially one that clearly had features that hadn’t been fully sorted out yet. At the same time, some of these features, like the 24/7 heartrate monitoring and improved data for sleep monitoring were definitely a draw.I haven’t had this device for months yet, and may update this in the future if I notice different things, but I will say if you go into this with the idea that you’re buying a health tracker, you’ll get about what you expect. This is not a fancy smart watch and if you want all the music features, additional apps, and things of that nature, this device is not for you. It doesn’t function like a smart watch near at all. The music player is limited to Deezer, which I haven’t tried. It allows you to navigate Pandora and Spotify on your phone through the device, which is literally the only feature I wanted a smart watch for when I was teaching dance, so for me it’s perfect. Almost everything else focuses on your health.Other reviews have commented on the press point to activate the watch being problematic, but I have had no issues. It doesn’t always come on when I turn my wrist to face, which was the same issue with all my previous Fitbit devices. However, the press point to turn it on is basically the same idea as my Charge 3, so maybe that’s why I have no issues there.Not all the newly available metrics have obvious uses. The additional sleep data is very much up for interpretation, but if you keep a log with how you feel when you wake in the morning, any correlation becomes obvious. While I don’t know how to interpret this data myself, it is something I’ve mentioned to my doctor and we will be reviewing on my next visit to help give us a bigger picture of what contributes to my poor quality sleep and other sleep challenges. This is one of the reasons I opted to upgrade when my Charge 3 was still working great and perfectly serviceable.In additional metrics, we should talk about that EDA scan that’s mentioned in all the reviews, but no one seems to understand. I’m actively trying to train myself to make use of that feature. A nifty little thing I’ve noticed, EDA responses don’t appear when I’m under high stress, but they do appear when I’ve experimented with using the quick scan feature as a non-visual timer for deep breathing in the middle of a anxiety attack. While I don’t know if this is reliable, it is giving my medical team more information to try and figure out what’s going on, so this may have useful implication in the future.Another note on the EDA quick scan, as I haven’t done any of the guided sessions, it gives you information on your heartrate variability in comparison to your baseline, which I assume is taken from your sleep baseline. Below baseline indicates high stress where above indicates a relaxed state. For me, this has become a useful tool to make sure I’m getting enough exercise, which directly impacts my depression. I know some people out there say “just make sure you get XYZ amount of exercise every day.” For me this is giving me useful data on how much and how often is enough to get that number up. Will a run or yoga in the morning be effective for the day? Does an evening routine impact the next morning? It’s quantifiable data that I can use as a cue in building my own routine.I also want to mention the other feature that sold me on this device, the 24/7 heartrate monitoring. Before the pandemic (and became increasingly difficult throughout the pandemic) I had taken up running. One of the things my training app asked was my heartrate during my run. Only problem was I could not accurately get that data as my Charge 3 needed me to remain stationary for an accurate heartrate read. While my heartrate on a run may not have been a necessary detail to include, not having that heartrate often meant exercises were missed and other activities that possibly should have flagged a response didn’t. My active minutes have dramatically increased as a result of having more accurate heartrate monitoring. I am also getting a much more accurate look at my activity levels and my calorie intake versus calories burned. This constant data is a lot more useful for anyone who is monitoring their health during exercise, trying to get an accurate calories in/calories out record, and anyone trying to get an accurate picture of what their activity level is throughout the day beyond simply steps to include things previous trackers may have missed. It even picked up on 4 minutes of cardio levels while I was doing an excited sword demonstration for my kids while homeschooling. Is that 4 minutes useful time? Probably not, but it’s good to put in my list of activities Fitbit wouldn’t have noticed before, but logs now, which also includes dance and other movement exercises that weren’t enough to trigger my Charge 3 to identify them as exercise. It was disappointing that 2 hours of dance 3 days a week would often only show up as maybe 30 minutes each day, and sometimes not at all. Those same practices (with an admittedly shorter 30 minute cap due to lack or stamina, thanks pandemic…) are being picked up in their entirety, even if my heartrate elevation is small, but enough to push it into registering in one of the “zones”. This has helped a good deal in getting an overall portrait of my health and activity levels, which I’ll be bringing to my doctor on my next visit.The only thing I have found is I haven’t been able to get 6 days of battery life out of it, generally landing at 4-5 days. For me this isn’t an issue as I don’t wear my device to shower and have had a habit since my original Charge HR (way back in the day) of popping it on the charger whenever I shower. This may also be why I don’t have any effect from the device or band as my wrist gets regular breaks.If you’re primarily looking for a smart watch and just want something with some extra features, this will not be the device for you. While the extra health tracking is a great draw, it loses a lot of the functionality my old smart watch had, the notifications for things like texts don’t always come through (which is fine for me because I don’t want that) and the pay feature isn’t fantastic. Again, that doesn’t matter to me because it’s a feature I don’t intend to really use anyway, but had to test it out. The apps are limited, and options for music and taking calls aren’t wonderful.On the other hand, if you’re looking for a device to give you detailed health information, to accurately log fitness activities, and increased metrics for sleep, this may just be the device for you. It’s the best fitness tracker I’ve seen so far, and this is giving my medical team some new information to work with, which may or may not be useful in the long run, but looks promising. That EDA quick scan had potential for people who suffer clinical anxiety or even PTSD as it can be used to cue deep breathing, and the resulting data may result in creating a better profile of what’s going on during an attack, or at the very least can result in creating a cue to take specific actions in a way that simply feeling in the moment cannot. Not all of this data will be useful for everyone, but it could be useful for someone who needs this kind of data to help understand their sleep patterns, anxiety levels, how activity, even in small amounts of a few minutes here and there, impacts their mental health, or even just someone who wants an accurate profile of their physical fitness throughout their exercises.I was 100% resistant to the idea of yet another smart watch, but in the end I’m happy I made the switch. The added information I’ve gained has given me a lot more understanding of what’s going on with me. I now have clues as to why nights I get plenty of quality sleep (according to previously going on just my sleep score) I wake up feeling tired, and I’m seeing a correlation with sleep temp particularly and low quality sleep. That 24/7 heartrate has been huge. I can now actually monitor my activity level instead of trying to track exercise my Charge missed (because I never turn on exercises prior to start as I never remember or can’t figure out which fits best), and result in trying to figure out a routine that way. Everything is logged now, making it simple and accurate. The EDA scan is becoming a tool to manage my anxiety, and while the metrics may or may not be useful, it does cue activities which are useful, so even if it’s no more than placebo effect, the end result is valuable.What you will get out of this device will be very personal and it depends on how you use it, and what you expect to get from it. The Fitbit Sense can be a useful tool for you and your medical team, or even you and your trainer, depending on your goals. This device is definitely not for everyone, and the price point does not make it worth it for every user, but if you’re looking for a tool to track your health, this one seems to be the best on the market to date.

  2. Jay

    Pretty Impressive after 1 month of usage.Updated Review:I initially gave it a 4 Star rating but just changed it to 5 Stars. I was having difficulty with viewing the daily rating of my Oxygen while sleeping. Some times it would register, other times it would not. I finally discovered that it was measuring my O2 level all the time. The results does not show up right away as you have to wait for a short time to appear.It did show me an upward trend in my temperature, resting heart rate, temperature variability with a downward trend in my Heart Rate Variability (HRV) when I came down with a nasty cold. I could trace it to the date it started.Original Review:The watch is pretty stylish. Comparing it to my sister’s huge Samsung watch, this watch is sleeker and filled with more health features than hers.For accuracy, it is pretty good, but not perfect. I walked exactly 100 steps by counting them out, and the Sense showed 102. I’m pretty impressed with that. The sleep feature seems accurate when it measures the time fell asleep until the time I woke up. Even though it may not be totally accurate against more accurate medical-grade devices, it does give me a baseline and I can measure my progress from that. The heartbeat rate is pretty much on target but I haven’t tested it above 120 where some people have issues with it being accurate.What I find inaccurate: 1) the stairs counter. It misses counting about 4 out of 5 times. If I go down the stairs to the main floor and then back up again, I count 32 steps. 2) I find the SpO2 function pretty useless. First, it is not anywhere close when compared with two actual SpO2 devices. Secondly, sometimes it records while sleeping and other nights it fails to record for no known reason. There are a number of similar complaints and frustration on the Fitbit forum about this same problem. Also, you must use their clock face to record, which I find inconvenient. So, if you are thinking about getting this watch primarily for that feature, I would caution you.Other than that complaint, the watch is quite nice. The charging device is genius, you bring it near the watch, and it instantly connects. Charging times are very short, so that’s a big plus. If you use it to record your sleep and then throughout the day, you might get 2 to 3 days between charges.Nice to have the texting and phone calls feature. Sometimes when I have my phone on vibrate only, I miss the call, but now with the Sense, I feel the vibration on my wrist notifying me of who it is. I can read a partial window of the text message too. When my phone is not on vibrate, I can text the person back through the voice feature. I can answer the call and talk to them through my watch; however, you have to hold the phone near your ear to hear them as the speaker is pretty weak.There is a learning curve if you are a first-time Fitbit user. This is true with the watch and with the App. The App is filled with many graphs and features. It will take some time to learn where they all are located, but eventually you will be able to navigate and find them. Speaking of navigation, if you swipe down on the watch to delve deeper into an app, you can swipe back up, but you cannot go back to the previous feature or forward to the next. You must press the button to go back home first where you must start your navigation over. I hope Fitbit improves upon this feature in the future.The silicone watch band was quite difficult to clasp and unclasp. It wasn’t the most comfortable either, possibly because my wrist was in between the sizing holes. The nice feature of the band is that it only takes a couple of seconds to change them out. I purchased a nice elastic one-piece band that allows me to take the watch off and put it back on within 2 to 3 seconds. Here is the Amazon link: and there are two sizes. I do recommend this band as it comes in a variety of colors and patterns.So, in conclusion, would I recommend this watch? I would say yes as long as you are not needing it for the SpO2 feature which I find unreliable.

  3. Precise Disarray

    so far so good, excellent clarity, accurate steps & heart rate, easy set upProbably want to select reviews based on “most recent” as that will provide you with most up to date and relevant information pertaining to this product. I acquired my Fitbit Sense in June 2021, it has not yet been a month, but so far so good with 24/7 use. I am slow to check out and use all the features, but what I have interacted with so far has been stellar.I have been using Fitbit products since April 2015- kinda have a love/hate relationship with this brand. I use the activity tracker constantly, and I greatly enjoy the app. So I have stuck with it as I upgraded over the years (Charge x2, Blaze x2, Versa 2, and now Sense). As with many Fitbit users, there is a known frustration with the products. Despite some of my own qualms, and having the ability to spend whatever I want on any fitness tracker I want, I still end up (so far) with this brand. Mostly because I haven’t found a tracker and app that I totally like better. I even have a Garmin, but I find that so far off base of accuracy (save for HR), that it is a glorified watch. Garmin seems to do best for actual intended activities (going for a run, going for a long walk, going cycling) where it seems to not be accurate in steps for any other part of the day (only counts about 1/3 of actual steps unless engaged in a longer duration activity, and even then it takes a few minutes for it to start). Also, the app seems to have a lot of info, but doent really tell me anything. That being said, when it was time for me to buy another fitness tracker–I went from Versa 2 to Garmin.. back to Fitbit. I went with the Sense because the price was right, and it was an upgrade over the Versa 2. After my underwhelming experience with the Garmin, I would have happily taken over a 2nd hand Charge from 2015. At least my steps would be accurate.Ok, so back to the Sense. WOW, the visual on the screen is really clear and precise. Even way more so over the Versa 2, and I had no issues with that. Set up was EASY, and QUICK. Basically, just like in adding any other fitbit, just let it pair and it will very quickly be all set and ready to go. I didnt have any weird upselling offerings, or at least nothing that wasn’t fantastically easy to opt out from. Nothing shady that I saw.ONE POINT that I DO think is important to know is that if you happen to have a Versa 2 (Not sure if this also happens with regular Versa, Versa Lite, or Versa 3), but this could not be added alongside my Versa 2. I had to take the Versa 2 offline in order to add this Sense. I know this is the case with trying to add more than one of the same products, yet I have always been able to have several Fitbits paired no problem, as long as they were different models. SO, I guess the Fitbit app sees Sense and Versa 2 as the same. Not a big deal as my Versa 2 had essentially died after I wore it on a hot humid day and my sweat killed it (then I brought it back to life after putting it in a bag of rice for about a week, Then afterward the battery was never the same. It drained to nothing daily.. and I needed to not have to worry about daily charging.. hence my picking up a Garmin in the interim to see if I liked them enough to spring for a more fancy model–nope– and ended up buying the Sense.)Hope it lasts. I love the look. The band is way better than the old pin style. Swapping out bands is so much quicker, easier, less need for super fine motor skills. LOVE the charger. It just sort of magnetizes to the fitbit. No need to clip in.SP02 wasn’t the main feature I was drawn to, but in order to have accurate use it seems a special clock face is needed, and that clock face will drain battery quicker (from what I have read). That being said,Battery life has been excellent for me.Love being able to add other apps, and features. Scrolling is easy, turning face on/off is not complicated.HEART RATE is accurate. I have tested it against my garmin, two blood pressure devices, and a doctors appointment. All saying the same.Also, I the voice assistant is great. You can choose GOOGLE Assistant, OR Alexa. This is why selecting most recent reviews on this sort of stuff is important, as the early release of Sense did not have Google Assistant, but would soon with an update. True, and they followed through as I have it.AT THIS TIME, I have ZERO issues, concerns with this Fitbit Sense. I will be back to update as I learn more, or if I have anything worth sharing that is bad. I keep up with my reviews as needed.

  4. Andre B.

    I love my Fitbit Sense!It’s stylish looking, very comfortable, but most important for me extremely accurate! Not missing calls or texts and being able to talk to people from the watch is great but for me accurately knowing how much sleep I got, accurately knowing how many steps I took, being able to see my resting heart rate and having the alarm buzz my wrist instead of making noise at my selected times are the best features. The accuracy of all these things is why I absolutely can’t be with out my Fitbit. I’ve gotten my whole family hooked on Fitbit as well. Via the phone app we can all see each other’s steps so we encourage each other to keep moving. Accurate sleep info on a daily basis is VERY important to me. That said, a watch has to be comfortable enough to wear for long periods of time in order to collect that kind of data. Honestly, I forget it’s on my wrist half the time because it’s that comfortable. Meanwhile my Apple Watch is somewhere collecting dust. My Apple watch used to irritate my skin and because of that I had to take it off periodically, and I hated that.I almost completely forgot to mention the battery life. It’s great! I tend to charge it every so often (once a day) because I like to see it close to full but as I’m writing this I haven’t charged it in at least 3 days and I have 25% left. Another great thing is that it charges really fast. Sometimes I’ll just put in on the charger for 5 minutes and come back and it’s at 80%+ from as low as 40%. It’s just a great watch overall and I highly recommend it to anyone who finds health info and being on time really important.

  5. David Barker

    It’s what I thought it would beIf you read my other reviews, you’ll note that I *rarely* give low marks and that’s very relevant here. I had specific, narrow-focus interests defined for this purchase, researched that interest with as much care as possible, made a purchasing decision based on those interests and got exactly what I expected. Reading reviews like this are one small part of making that decision, which is why I’m posting mine. Doing that is why I so rarely buy something I don’t like. Due diligence.I’m not rating the app or the sleep tracking because I don’t use them. No idea if they work. I don’t care about how it interacts with my phone, because I don’t want to be seen talking to my wrist and with eyes well over 60 years old I’m not reading my SMS on a screen this small, tyvm.The specific features this model offers which *are* relevant to me over other models – you can infer them from what I haven’t mentioned yet – work well and cost less to have than the offers from competitors, most of whom also think you want to be Dick Tracy. The white/gold aesthetic is minimalist while at the same time receiving compliments from casual observers, and I agree with them. If it gets dirty, I run it under the faucet and clean it. No biggie.Special mention should be made of the included bands. I’m a man of small stature – 170cm – and did not have to resort to the “small” band, instead using the “large” band on its’ second-smallest setting. Fits my particular wrist better that way, although I can also fit the “small” band with less overlap than the attachment regimen (excess band under rather than over) allows. It fits better that way for me, but the important point is that it’s difficult to imagine many human beings exist who can’t leverage one or the other. On the wider settings the darn thing falls off my wrist. *Major* adjustability. It struck me as intelligent design and packaging.It’s what I wanted, and what I thought I was going to get. YMMV if if you want a crossfunctional, true “smartwatch,” which case might justify spending more money on the main competitors’ (admittedly quality) offerings. This one works for me, because I did my due diligence.

  6. katarinaism

    Cool watch, though lacking in some featuresI have been using this watch about a year now and am overall happy with it, but there are some features that are a bit lacking.What is good: I like the display screen size. the steps counter is pretty accurate, sleep seems to be captured pretty well (even naps during the day or distinguishing laying down from actual sleep time), and the heart rhythm capture is pretty neat (though, I’ve only used the ekg feature a handful of times). I like the option to track many different kinds of exercise including running, yoga, spinning and more. The EDA app is cool and the guided meditations have ushered me off to sleep many times. I do subscribe to Fitbit plus which is required to use some of the advanced features including many of the workouts and guided meditations. The value is ok for me as I’m not a frequent user of these features but could see more value for someone using the workouts more heavilyWhat needs work : the biggest thing for me is battery life; it does last me a couple days but tends to run out fairly quickly. Because I wear it mainly h go or sleep tracking, i don’t charge it during sleep and therefore slow charging can be a bit of a nuisance. Charging apparatus has been a bit finicky at times , sometimes charging very slowly or a few times finding it wasn’t charging at all because the contacts weren’t completely touching.What I haven’t used: I don’t use this heavily as a smart watch, so although it displays messages from my phone it isn’t much of a game changer for me. I also haven’t used wallet or music features, so these are untested for meOverall, a solid watch but I think has a lot of stiff competition in many directions. I am overall happy with it but wish the battery and charging had more efficiency

  7. Mama Kat

    Longtime Fitbit UserTLDR: glad I stayed with Fitbit vs Apple Watch.I have been a Fitbit User since 2013. I *almost* switched to Apple Watch for this purchase 😱 but I am so glad I did not. With the Sense 2 coming out shortly the discounted price on the first model made it an easy choice. However, even at full retail I would’ve kept with Fitbit.My sister and brother-in-law have both had the Sense for a while, and seeing it in person assured me it isn’t as big/bulky on my wrist as I feared. And also not as delicate as I feared. My sister uses a full plastic case on her screen. I had considered one myself but after finding it impedes the EDA, I opted for a film protection instead. I am a longtime user of the wristband, and would’ve preferred to stick with them. However the EDA sensor and stress management features were what I wanted for this purchase, and since I could only find them in the smart watch, here I am.For battery life alone, Fitbit wins. The Fitbit pay has less banking/card options than Apple pay but it’s not a deal breaker for me. The small band fits tightly, making it uncomfortable and impractical (sweaty and itchy) for me personally; the large band fits comfortably with no complaints. And there are plenty of free custom “clocks” if you’re willing to look (the one pictured is by “Amy,” much love to her and her clocks ❤️ ). I had seen several reviews with concerns about the charging cable pins wearing no out. Asking my sister, they’ve had no issues with either of theirs in over a year of use.Fitbit has become a family affair – we love competing in the various challenges, especially Bingo! Would’ve definitely missed out on this if I had made the switch.

  8. George D. Wesolowski

    Poor charging cable design, and a few other flaws …I’ve had the Fitbit Sense for 4 months now. It does a decent job of step tracking, heart rate monitoring, and sleep monitoring. I can’t really say how accurate these numbers are, but for me they seem to be “good enough” to use as a baseline and to track my steps and level of exercise and sleep.I have also used the Fitbit API to download my data from the Fitbit servers to do further analysis and charting as a personal “data science” project.The battery life is quite good; I do not use “always on” mode and I get 6 days on a charge.I can still use it as an old-school watch with an analog face – a plus for me.However, the battery charging system has a serious design flaw. After 4 months I started getting messages that the watch was “slowly charging”, and that I should try a different charger. [Finally, the unit would not charge at all.] After some online investigation, and using a current meter, I learned that this is a completely misleading message. When connected properly the watch only draws 5.1V and about 0.33A – so you don’t need a powerful charger to charge the device. The real charging problem is caused by the 4 tiny spring-loaded pins in the charging cable. After 4 months, one of them would get stuck in the down position and fail to make contact with the back of the watch. A new charging cable did the trick – if those pins make good contact, the unit draws 5.1V, 0.33A, and charges at approximately 2 – 2.5% per minute, and you don’t get the misleading “use a different charger” message. But it seems like a poor design to have to replace the charging cable every 4 months or so. My original Fitbit One had two larger pins that clipped into the charging cable with a very positive “click” and it never failed. This new design is a major step backwards.The Fitbit API works reasonably well, and uses two-factor authentication. However, numerous times I have gotten repeated text messages with a confirmation code that I did not initiate. I’ve changed my password (it is strong) several times, so I don’t know what is going on there. But I have data privacy concerns. Fitbit really needs to provide a Bluetooth API to allow me to access my data directly from the watch itself, so I can store the data and analyze it locally without having to go through the Fitbit servers.The last time I checked, Fitbit “sleep score” calculation was shrouded in mystery and unavailable from the Fitbit API – why isn’t this bit of information at least available through the API?The $9.99 / mo subscription service for “premium” data is a non-starter for me, considering I have to shell out $$ every four months or so just to keep the device charged and running.There also needs to be a way to store blood pressure readings, even if the sys / dia values are manually entered by the user and tracked (such as the way weight is handled). And, although I don’t track blood sugar regularly, I’m sure those that do would appreciate at least the means to store and track this data as well.All things considered, it is a decent fitness tracker, with some shortcomings.

  9. Gigi

    Great! But must charge daily!I love this watch. I find it to be very accurate but it did take a bit to figure out why the app and another settings link (from clicking on something in the watch) did not match up (for example, the weather was reporting Celsius instead of Farenheit on the watch but not on the app, but somehow I ended up clicking on something in the watch to a settings link and it showed Celsius so had to change that to update the watch), however, everything else matched up. I love it for tracking my sleep and SO2 and number of breathes per minute. It isn’t that accurate tracking steps or stairs though. I like extra apps I can download to it to track other things as well. It does cost a fee for premium features after 6 months but it seems reasonable. The only downside of the watch is when I first got it, it last 3 days without needing to charge. Now I have to charge it daily! It’s annoying, otherwise I love this watch.

  10. Colin M Jones

    Splish splash this FitBit Sense is trashI rarely feel compelled to write reviews because the products I usually get are 4-5 stars and I have nothing helpful to add to the review. In this case, I am furious (at FitBit) at how bad this flagship product is for anything involving;dr: heart rate tracking during exercise, lifting or cardio, is so busted it qualifies as false advertising. It was off 20-80 BPM during cardio. Can’t even express my shock adequately over that.My background: I’m not an athlete, I’m a regular guy who enjoys lifting, hiking, spinning, and working out in general. I workout 4-5 times a week for 30-90 minutes per session unless I go for long hikes (3-6 hours). I know what my heart rate is when I work out. I’ve used a FitBit Alta HR for the past 4 years and I’ve sporadically used a Polar heart rate band around the chest. I know what various heart rate levels feel like in my body and can guess within +/- 10 BPM based on fingers to my neck or wrist. I’ve had this FitBit Sense for a week after retiring my Alta HR (still working!!!).In the four images, you’ll see two different recent workouts. The first image is from 11 November with my Alta HR. I had just finished lifting weights (image 3) and went over to the elliptical and powered it up to resistance 45/100. My METS output was between 10-12 the entire time. You can see the Alta HR took a moment to catch up to my heart rate, but once it did, it was accurate. I really was going hard the entire time and ended the exercise before doing my cool-down. I can sustain my heart rate at 165+ during cardio for 30-60 minutes depending on what I’m doing. I’ve been able to do that for years. I know what a high heart rate feels like in my chest, in my neck, and on my wrist.The second image is from today, 25 November with my FitBit Sense. I had just finished lifting weights (image 4) and went over to the elliptical and powered it up to resistance 45/100 (sound familiar?). My METS output was between 10-12 the entire time (sound familiar?). Only this time, my Sense appeared to catch up and then it flatlined and reported me for 25 minutes between 82 and 89, which is so laughable it’s actually criminal how wrong that is. I tested my heart rate using the machine itself (which is reliable within +/- 5 BPM) and it showed me at 165. I put my fingers to my neck and felt a pulse of around 160-170 (not a doctor or an EMT but I’m a musician and know the difference between 82 and 165 on the metronome).For weight lifting comparison, see images 3 and 4. I chose the same workout for comparison (upper body) and I am WELL aware that wrist-mounted HR monitors struggle with weight lifting because of hand grips changing the circulation of blood to the wrist. You can see in image 3 that I have peaks and valleys – my HR is going up right after doing the lift and it comes down during the 60-90 sec recovery. The Sense (image 4) struggled mightily, showing what appears to be a more “consistent” reading across but missing the peaks and valleys that weight lifting leads to. For more context, I was benching 185-225 during the first 8 minutes where it saw me in fat burn and I can tell you, my HR was well above 120ish after the set at 225.All of the other FitBit Sense features, so far, appear to be great. I like getting notifications on my wrist that I can choose to see, like having my various messaging apps notify me. I like the Star Trek Console clock face – kudos to the developer because it makes my nerdy side smile. I like that it measures SpO2 while sleeping. I like that I get excellent sleep tracking that compares very well to my old FitBit Alta HR. I like that I can input other metrics like my weight or stress into it with the Sense. I haven’t yet tried the ECG or EDA, but I expect those probably work just fine too. The visual of the watch on my wrist is nice and people have already complimented it.But the fact that in November of 2021, more than a year after launching this flagship, $300 product that is meant to compete with the Apple Watch, Garmin Vivo series, and a suite of decent Samsung watches, more than a year after MANY online complaints about the heart rate monitor not working during exercise, for this to still be a problem indicates that something is actually wrong at FitBit itself. I work in a medium-sized corporation and if our flagship product was actively FAILING to do the ONE most basic function the entire company was LAUNCHED on, people would be getting fired left and right. I guarantee you that the engineering department likely has not received enough negative feedback about this. I’m sure this review will never be seen but it sure is making me feel better writing it.It’s not only laughable, it’s actively pathetic that a FitBit heart rate sensor in 2021 cannot accurately record a heart rate during exercise. My Alta HR, from 2017, was accurate. This thing was 20 to 80 BPM off. That is STUNNING. That is EMBARRASSING. That is FALSE ADVERTISING. No athlete, no gym rat, not even a regular person wearing one of these should even remotely trust any of the other readings the sensors provide if the most basic, most simple, most well-tested sensor since the mid 2000s, a heart rate sensor, isn’t working right on a $300 flagship product. I mean it’s so inexcusable I can’t even believe I’m writing this.And real quick – the FitBit customer service representative claimed that “I wasn’t wearing it right” (per FitBit’s own instructions, I’ve been wearing the Alta HR above my wrist by two finger widths for 4 years and did the same with the Sense this past week). Then, he told me that I couldn’t “claim” the warranty, after one week mind you, because I DARED to mention that I did a comparison with a Polar HR band. Somehow, mentioning that you know what you’re talking about and can see the faults means you don’t get a product replacement? Literally that’s criminal behavior and FitBit should be shocked and embarrassed by that. I don’t know who they contracted their customer service out to (and I won’t indicate from what region this person likely was because there’s no need for that), but wow. I’ve never had a worse customer experience over the phone in my LIFE. And I’ve had to deal with cable companies!But lemme give a quick shout out to my man Joshua, the Amazon representative. Five stars. He heard the whole conversation and he couldn’t even believe the FitBit customer representative was actively avoiding trying to provide a replacement. And so he had my back and processed a refund.

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