⏱️ WHOOP 4.0: Your 24/7 health edge—because every second counts.
WHOOP 4.0 is a premium wearable fitness tracker that offers continuous, real-time monitoring of key physiological metrics including heart rate, respiratory rate, sleep quality, and recovery. It features a 5-day battery life with a water-resistant, on-the-go charging pack and comes with a 12-month membership providing personalized insights and community support. Designed for professionals seeking data-driven health optimization, WHOOP empowers users to improve performance, wellness, and sleep through actionable analytics and a sleek, comfortable design.




















| ASIN | B0BWSF6H4Q |
| Battery Average Life | 5 days |
| Battery Description | Lithium-Ion |
| Best Sellers Rank | #13,831 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #84 in Activity & Fitness Trackers |
| Brand | WHOOP |
| Brand Name | WHOOP |
| Color | Onyx |
| Compatible Devices | Smartphones, Tablets, Laptops |
| Customer Reviews | 4.1 out of 5 stars 2,560 Reviews |
| Display Size | 4 Inches |
| Included Components | Initial 12-month WHOOP membership, 4.0 hardware, Onyx SuperKnit band, and wearable, water-resistant* battery pack. |
| Item Dimensions L x W x H | 1.1"L x 0.4"W x 7.1"H |
| Item Height | 1.02 centimeters |
| Item Type Name | Fitness Tracker |
| Item Weight | 0.31 Pounds |
| Manufacturer | WHOOP |
| Material | Metal |
| Material Type | Metal |
| Model Number | 973-001-000 |
| Product Dimensions | 1.1"L x 0.4"W x 7.1"H |
| Screen Size | 4 Inches |
| Sensor Type | Wearable |
| Team Name | WHOOP |
| UPC | 810114360002 |
| Warranty Description | Lifetime warranty |
D**N
Ton, tons of information
I was looking for something to track my sleep. There’s 1 million gimmicks out there with devices like under your mattress or using the Apple Watch or what not. A lot of them are dubious in their accuracy. I spent a lot of time looking into various methodologies and devices to find one that is legitimate. I think this is the one. It is a little expensive after the first year with the monthly bill but there’s a real accurate set of data given about you every minute of every day. It does a better job than several other devices that I’ve tried in the past and it feels more accurate based on how I’m doing. the most interesting thing is that it does encourage me to be more active as well. I did come into this looking only for a sleep tracker, but because of all the other data that is collected it encouraged me to get more active. All in all, I do think this had had a positive impact on my welfare and well-being. I’ll probably continue to subscribe even after the free year of service ends. Recommended if you’re interested in having in-depth and accurate knowledge about what your body is doing.
H**S
Purchased for sleep and day to day tracking, def worth the membership
I love mine. I got it strictly for tracking my sleep and heart rate but have now learned of many more features that are helping be more attentive. I makes point to journal in the app every night and since having mine, I have been unknowingly watching my health more. The sleep tracker is also the best sleep tracker I’ve ever had, and I’ve had about all of them. All the poor reviews almost had me go a different route (oura ring since got my wife one; but for menstrual tracking I think oura is better from what my wife says) but decided to try it since my Apple Watch is very unreliable and dead before I’m home from work even though only a year old. Needed a tracker specifically for my health and sleep, and this does that. From what I can tell from the poor reviews, it seems those making the comments are either not very technically inclined or just havent taken the time to do the walkthrough of the app. It allows you to customize just about anything. Yes, the first 7 days it will be limited as it’s calibrating but for accuracy it must do that. I was also surprised how much I like the standard band. I forget I’m wearing unlike my Apple Watch. I wear both at the same time all day and keep my whoop on forever since you can charge from anywhere with the battery pack. That’s a pretty cool feature. I would just say…. This is not a $5k medical tracker for serious health concerns, if you’re healthy or relatively healthy this will be perfect for tracking your day to day and night to night. Definitely worth the money. And I have no problem putting in my CC at sign up even with a paid 12m membership, at the end of the day you’re paying for the software of the device and app, that’s where the magic is, not the band and device. It is worth every penny!!!!
J**A
Hot Garbage *update 6: May 2025.
** May 17 This will be my last update, my subscription is up in a few weeks, and I will not be renewing it. I’ve decided to try the pantherwearables eclipse. It’s a new device so it might be totally terrible but hard to imagine it’s worse than the whoop. Today I completed a 5.8 mile hike wearing a 65 pound weight vest. As I’ve observed before there’s a pretty agreed-upon metabolic standard for walking, even a pretty casual flat walk around your neighbourhood burns something on the order of 100 to 110 cal per mile, more if you’re a bigger person less if you’re smaller. If you add in Hills and extra loading, uneven terrain, you burn yet more calories per mile. Every fitness tracker I’ve had (and this is the sixth or seventh I’ve used) ties out with this rough equation. Some a little higher, some a little lower. The whoop, however, thinks. 5.8 miles carrying 60 pounds as a 190# man is worth 223 cal. It’s tracking my distance. It knows how far I went and yet 223 calories. Maybe mine was just a dud, I suggested that to them early on they told me to reset it update the firmware, nothing helped. So unless my particular sensor was just a lemon, I’m confident saying that calling the whoop worthless is giving it too much credit. It’s expensive and what you get for your expensive subscription is bad data and useless feedback. Not anymore. Cheers. ** update March 9. I completed a 5.1 mile hike with an average pace of 3.5 mph. What does the whoop say? 271 calories. If you look at the internet. For my weight and that pace the calorie burn is between 550 and 620 kcal. But whoop, whoop says 271. I have never used a more inaccurate unreliable piece of trash. **update 10/19 deducting yet another star. The device is basically worthless. Sad because it’s a good idea and is expensive. Did a 3 mile walk this morning to warm up. I’m 190# man. Walking a flat mile even at a somewhat leisurely pace costs my body 110-125Kcal. Wearing the whoop and my Apple Watch. Watch records 350 kcal burned. The whoop…123. Both set to “walking” worn on opposite wrists. 123 vs 350. The device is absolute garbage. Avoid it. ** update 9/12. Deducting another star I really wanted to love this device and maybe mine is just a lemon. The readings, specifically heart rate which is one of the only things I am really truly interested in are so far from accurate that the device is almost worthless. This is disappointing because the device is both expensive and has an expensive subscription associated with it. I did a hard workout again wearing both my Apple Watch and my WHOOP. Was 30 minute EMOM. Alternating rounds of 10 double unders And 15 Russian kettlebell swings at 80#. So at least for me a metabolically demanding workout. During the double unders Apple Watch has my heart rate pegged between 165 and 175 Which makes sense based on the activity and how I feel (like I’m sprinting). The average for the whole Apple device was just under 150 BPM. Conversely, the whoop worn on my other wrist Shows my heart rate during the double-unders at between 96 and 120 (Which again is moronic) And my heart rate for the overall workout at 127. Only after I started my cool down and my heart rate dropped did the Apple Watch and the WHOOP come into line. I wonder if the WHOOP is just too imprecise as a piece of hardware so when your heart rate is extremely fast it’s missing beats, I’m just theorizing but it’s disappointing in any event. The AI WHOOP support is also completely worthless. canned responses and useless troubleshooting pages. I don’t know what device to recommend, but if you’re serious about your data, this ain’t it **update 8/25. I wore my my Apple Watch Ultra and Whoop at the same time today (albeit Whoop on right arm Apple Watch on left) as discussed in the main review below. I set both devices to “functional strength” and then went about my work out. Main part of the work out was 30 minutes. During that time. The whoop registered 241 cals burned and an avg heart rate of 119. The Apple registered 327 cals burned and an average heart rate of 129. I also noticed that during certain periods of the session, the Apple registered my heart rate at 145 bpm and the Whoop 107. I’ve been an athlete my whole life I know what 107 feels like, and I know what 145 feels like. I also at that point timed my pulse and got 140. Not sure if the whoop reflects a high degree of latency (claims it doesn’t) but that reading is way way off. Could also account for the meaningful deviation in calories. I pinged the whoop chat bot to ask. It was useless. Offered a lot of semi science mumbo jumbo about strain calculations. I’m deducting another star. I work out daily. Have for the last decade and a half. When I was younger it was conditioning for various combat sports. Now that I’m in my 40s it’s conditioning for the combat sport that is life. I still get after it pretty hard every day, and in the last few years have become interested in tracking biometrics. It started with various Fitbit devices, which were super limited, moving up to the pretty good Garmin instinct solar, to The OK Apple Watch Ultra (you can find my review on here somewhere) And now the Whoop. The reason I wanted to move away from the Apple Watch is threefold (although candidly the device is deeply flawed in general). 1) It’s far too busy, too much going on, too many notifications too much buzzing 2) The battery life sucks (2.5 days max) and 3) I really like watches, actual watches, aesthetically I think the Apple Watch Ultra is just awful. The WHOOP checks all the boxes. It has no screen or buttons, it does not buzz. It is extremely minimalist. It is very lightweight And comfortable. Battery life is about a week, However, in a bit of pretty ingenious engineering, you don’t take it off to charge it. You charge a small battery pack That Whoop wears like a backpack on your wrist. So every few days I just slap that on after my workout the Whoop charges fully in a manner of minutes and we go about our day. The Whoop interface is ok. Its fine. I think there’s a lot of data in there and I’m just getting used to accessing it. I like that it’s sleep and recovery focused. Every day I get a grade for my sleep quality (usually not great) And a related grade level of “recovery” from yesterday. I don’t pretend to know the science behind the recovery statistics, however directionally they are in line with the way my body feels in the morning and throughout the day. The major flaw in the WHOOP design that I have encountered so far in its “strain” calculations. Once you wear the device for a few days It starts to make customize recommendations for how hard you should push yourself physically given your recovery level. That’s fine, Although I tend to just move through my schedule of splits and conditioning irrespective of what the Whoop says. What I have observed though, and it annoys me, is that the calorie calculations are way off relative to every other device I’ve ever used. For a given activity I think they’re probably 20 to 30% low relative to the Apple and 40% low relative to the Garmin. They’re also internally contradictory. Here is an example: today was a conditioning day. I did a pretty hard workout which consisted of timed sets of pull-ups, push-ups, and jump squats. It’s a 30 minute timer. You do seven pull-ups 15 push-ups and 20 squats per minute and then rest the next minute, etc. So you wind up doing the high volume of movements. And your heart rate is quite elevated. My Apple Watch records this session at a bit over 400 calories. My WHOOP records it at 258 calories. I’m not sure which is right, But I will say that the WHOOP has a “strain” score, which is roughly a measure of how hard your body is working during the exercise. Before the exercise “processed” my score 8.2, with a heart rate averaging in the 130s with peaks in the low 160s. When I finish the exercise and added in the movements as prompted by the WHOOP It recalculates the strain score to 16.8. Reflecting the work rate associated with the movements I was doing. So the strain increased to almost double to accommodate the amount of work done during the session. Why did the amount of calories calculated by the WHOOP not increase? Exertion requires thermodynamic energy; my strain went up because I was doing more work, work = energy output= calories. So that is a bit bit silly. Overall I’m still pretty happy and the actual numbers don’t matter, although little sloppy nits like this bother me. Maybe they’ll work it out in a future software release.
Y**D
Beat sport tracker
It is the best tracker on the market, theoretically you can get the same benefits from apple watch, but you have to use bunch of apps, and charge it daily. But the whoop remove all the distractions of a screen and provide long battery life.
B**E
Life changing
I purchased this for to track strain/recovery for neurological issues. It's not a medical device, but it allows me to better know when to stop and when I can safely push it a little. Overall, it's been life changing. I have a much better understanding of how my actions impact my health. As a result, I've been able to focus on actions that promote greater recovery and it's made a substantial difference in a very short amount of time. it's also allowed me to see trends that weren't visible on my Apple Watch. The app is very helpful and once you understand the data behind the metrics and how to navigate, it's insightful. They released version 5 right after my purchase and upgraded me at no cost (you're actually paying or a membership). The 5 is about the same, however, the band doesn't latch as easily for some reason. It does add some metrics, but they haven't opened bc they need more time to calibrate. All--in-all the device itself is very well designed. The band breathes well and is easy to wash. It dries quickly and it doesn't get funky. The battery lasts days - which is wonderful, so wonderful I stopped wearing my other fitness band and I'll probably go back to a regular watch. The Apple Health integration is also nice, and as someone who has used other fitness trackers - both Apple and Fitibit - I don't feel like I'm missing anything, this actually has everything but the ECG which you can get in the upgraded version if needed.
A**R
Get an extra charger!
Enjoyed having the whoop band. Overall solid product however the charging system can be difficult to keep up with. I suggest purchasing another charger to keep at the house. The data provided assisted in my goal of improved activity.
L**Z
Life-Changing Sleep Tracker with Personalized Insights
So, I was totally on the fence about getting this thing because of all the negative reviews floating around. But let me tell you, this sleep tracker is a game-changer! It's perfect for anyone who wants to dive deep into their sleep quality and recovery process.I've only had it for a short time, like less than two weeks, and already, I'm blown away. It's seriously helped me figure out when to go all out and when to dial it back for a rest day. The sleep data it provides is top-notch, and the AI-generated suggestions tailored to your health goals and daily habits are spot-on.Now, the only downside is the starter band, which kinda sucks, to be honest. My advice? Save up for a better one if you're planning to stick with Whoop for the long haul. Oh, and here's the best part - it syncs up seamlessly with Apple Watch and Apple Health. It's not about choosing one over the other; they actually work together to give you a more complete picture of your health and fitness journey.Trust me, this sleep tracker is a total game-changer. I can't recommend it highly enough!
E**H
Simple and Informative!
I've had this for a little less than a week but so far it's been very useful. The data it provides gives great insights that I use to maximize my general health and fitness. The sleep tracker has changed my behaviors so I can be at a higher level all day especially for workouts. Sleep detection and Activity detection make it easy to see performance for both with minimal interaction with the app. I also like the community section so I can see where I stack up in my gym group compared to those I know are very fit. I gave the mobile app rating 4 stars for a few reasons. I am on Android. First, the profile photo upload will not work and crashes the app. Two, navigating the heart rate chart can be a little glitchy with the selection bar jumping around. Three, it would be nice to see daily max heart rate as well as activity max heart rate in a quick view instead of trying to precisely navigate to it on the charts. It would be easy to just pull it up in the average heart rate card.
Trustpilot
1 month ago
1 month ago