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Customer Ratings & Reviews

Your price for this item is $299.99

Customer reviews

Rating 3.5 out of 5 stars with 44 reviews

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Rating by feature

  • Value

    Rating 3.4 out of 5 stars

  • Quality

    Rating 3.5 out of 5 stars

  • Ease of Use

    Rating 3.6 out of 5 stars

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Cons mentioned filter

59%would recommend to a friend

Customers are saying

Customers express satisfaction with the Breath Fat Burn Tracker's accuracy, saying it is comparable to a blood test. Many users also find the device helpful in monitoring their ketosis levels and weight loss progress. However, some customers complain about its slow performance and short battery life.

This summary was generated by AI based on customer reviews.

The vast majority of our reviews come from verified purchases. Reviews from customers may include My Best Buy members, employees, and Tech Insider Network members (as tagged). Select reviewers may receive discounted products, promotional considerations or entries into drawings for honest, helpful reviews.
Page 1 Showing 1-20 of 44 reviews
  • Pros mentioned:
    Accuracy

    Rated 5 out of 5 stars

    You're Gonna Love It!

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    Posted . Owned for less than 1 week when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Great unit! Vibrates to clean the sensor, takes about 3 minutes or less to ready itself for use and your off to the races! 99.8% accurate compared to blood testing but better than ketone strips. App has changed from the screenshots available here (so I provided new ones) but still provides the same info! Food input on the app could be more precise, but I use a different app for that. Not a large unit and very lightweight!! Three tests per day and you can get an accurate idea of where you stand in your journey to lose weight or whatever you choose to use it for! Well worth the money!

    I would recommend this to a friend
  • Pros mentioned:
    Ease of use

    Rated 5 out of 5 stars

    Game Changer for anyone on Keto

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    Posted . Owned for less than 1 week when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    This product is game changer! Makes Keto much easier to track and understand vs test strips.

    I would recommend this to a friend
  • Pros mentioned:
    Ease of use
    Cons mentioned:
    Battery life

    Rated 3 out of 5 stars

    Works, easy to use... not sure it's for me.

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    Posted . Owned for 1 month when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Well it works, however I'm not impressed with the overall experience. We been doing Keto for about 18 months and normally use a home blood test to check ketone levels. That works well but far more involved, etc... than the thought of simply blowing into a device. Trying to compare ketones levels and the "index" scoring of this device is challenging. I can register a low-mid level ketone reading on the standard device while this one reads zero. With the ease of this device you can monitor all day long. After fasting and exercising this device still showed zero through out the day while blood tests showed significant ketone levels. I still haven't found the best way to interrupt the scores from this device though it is easy and convenient. The battery does drain fairly quick, requiring charging daily based on my use.

    No, I would not recommend this to a friend
  • Rated 3 out of 5 stars

    Disappointing quality.

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    Posted . Owned for 3 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Device is less than a month old. Originally it would take 1 minute to initialize. Now it takes 5 minutes. Contacted Biosense tech support who indicated: “We do see from your devices diagnostic data that there may be something interfering with the device's sensor that is causing the longer than normal preparations.”, and was asked for the device to be sent in for repair. I would have expected an RMA issued, with shipment paid both ways, to get me a good working device. Anything else would be unacceptable.

    No, I would not recommend this to a friend
  • Pros mentioned:
    Accuracy, Ease of use
    Cons mentioned:
    Warm-up time

    Rated 5 out of 5 stars

    Far better than a finger stick

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    Posted . Owned for less than 1 week when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    I have been using the Biosense for over a year. This is my second one (lost one on a trip). Great device to mesure my sucess fasting and low carb. I have run multiple test with it and my Keto-mojo. Its just as accurate as a blood test. No painful finger stick either. New firmware seems to have decreased the warmup time. If you’re serious about a low carb, or low insulin life style this is the best investment you can make.

    I would recommend this to a friend
  • Pros mentioned:
    Accuracy

    Rated 3 out of 5 stars

    Consider a second-generation version

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    Posted . Owned for 3 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    The overall feel of the device is good and takes quick measurements. However, I'd consider waiting for the second-generation product. I suspect my unit had a defective pump (it rattled and was excessively loud at 60 dB(A) instead of the 10-30 dB(A) support claimed was normal). Measurements were also lower than urinalysis test strips, although one could argue lung sampling is prompt and more precise. Other oddities make this device feel dated: Micro-USB instead of USB-C, slow UI and low-resolution display (contrary to touched-up product images).

    No, I would not recommend this to a friend
  • Pros mentioned:
    Weight loss

    Rated 5 out of 5 stars

    Great for Fasting and Weight Loss

    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Great as a guide for intermittent fasting and tracking impact of food to fat burn for weight loss. I was able to set my target range of fat burn for ketosis whether I am fasting or doing ketogenic diet. For the first time, I can see how carbs impact my personal fat burn and then adjust food...app was very supportive with great graphs.

    I would recommend this to a friend
  • Pros mentioned:
    Accuracy
    Cons mentioned:
    Warm-up time

    Rated 1 out of 5 stars

    Eh...it works

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    Posted . Owned for 1 week when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    It works... but its extremely slow and vibrares for 3-4 minutes while warmimg up. I keep having to set the time and date because it wont save. It seems fairly accurate, but operates as a prototype and not as a consumer ready devive. Will likely return and wait for an upgraded model.

    No, I would not recommend this to a friend
  • Rated 1 out of 5 stars

    Device does not last. Not worth the money.

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    Posted . Owned for 1 year when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    I purchased the device back on December 21,2021 and the device stopped working properly on February 9, 2023. I reached out to support and they charged $85 which included shipping to repair the device. The device was returned to me on February 27th and today March 17th 2023 the device is again not working. Save your money and time this product is not worth it.

    No, I would not recommend this to a friend
  • Pros mentioned:
    Weight loss

    Rated 5 out of 5 stars

    Keeps me on track

    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    I used a low carb diet to lose about 15 pounds but then started putting the weight back on. This device lets me tune my diet and exercise so I can control/maintain my weight loss without guessing. I mean, sometimes you just want pizza and that’s ok! As long as I spend some of my time burning it off I’m good! This lets me really see what my body is doing, it’s great!

    I would recommend this to a friend
  • Cons mentioned:
    Battery life

    Rated 4 out of 5 stars

    Great tool to track your ketosis!

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    Posted . Owned for 1 month when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    I was a little skeptical about this Ketone monitor. It was the first I've used, but watched plenty of videos and reviews. I don't follow a super strict keto diet, but I do fast and only eat one time a day. This has been a great tool to track how my fasting has helped in my fitness journey. Only reason it didn't get a full 5 star review is that it eats through battery life way too fast. The vibrate on this is ridiculous, although it's for calibrating/cleaning/testing etc.

    I would recommend this to a friend
  • Pros mentioned:
    Ketone levels

    Rated 4 out of 5 stars

    Ok so far

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    Posted . Owned for 1 month when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    I had to send this for repair less than 1 week after having it and I was without it for 1 1/2 weeks so I had an initial bad reaction. However, I've had it for a couple of weeks since it's return and it seems to be okay now, though I'm cautiously optimistic. I do like to be able to keep up with ketone levels while doing IF and it definitely helps with that. Hopefully it holds up without me having to send it in again.

    I would recommend this to a friend
  • Rated 5 out of 5 stars

    A Game Changer!

    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    I have been a fan of the keto lifestyle for a few years. I’m so grateful for a device like Biosense that gives me a sense of my level of ketosis throughout the day (without requiring me to draw blood!). I’m excited for new features to roll out on the app (like the newest, Time in Range). I love starting and ending my day with breath work & my device. And the more insights, the better!

    I would recommend this to a friend
  • Cons mentioned:
    Warm-up time

    Rated 5 out of 5 stars

    This changed my life-heath is priceless

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    Posted . Owned for 1 week when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    App is not required unless you want a history. I skip the app and just use it to test myself on the spot to ensure I’m in ketosis, about 3 hours after eating. It takes 2 minutes for it to warm up, then you just blow into it for 3 seconds. Read the booklet first to understand how to use it.

    I would recommend this to a friend
  • Pros mentioned:
    Accuracy

    Rated 4 out of 5 stars

    Good Monitor for Keto diet

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    Posted . Owned for 4 months when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Good monitor, but a little slow to show results. Seems pretty accurate, compared to my blood test results

    I would recommend this to a friend
  • Rated 1 out of 5 stars

    Cheaply made

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    Posted . Owned for 1 week when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Okay concept, but super cheaply made. It has the quality of a happy meal toy from mcdonalds.

    No, I would not recommend this to a friend
  • Rated 1 out of 5 stars

    Don’t waste your money

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    Posted . Owned for more than 2 years when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Absolutely awful and worthless, does not work. Support is terrible.

    No, I would not recommend this to a friend
  • Rated 4 out of 5 stars

    Great information but be patient

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    Posted . Owned for 1 month when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    This product is extremely useful in hacking into your bodies information. The only use I’ve had is it’s a little slow to boot up, also syncing to your phone can be tricky.

    I would recommend this to a friend
  • Pros mentioned:
    Ease of use

    Rated 5 out of 5 stars

    great

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    Posted . Owned for 3 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    it is so easy to use. i use to everyday to keep track of keto

    I would recommend this to a friend
  • Rated 1 out of 5 stars

    Great Concept--Poorly Executed

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    Posted . Owned for 1 month when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Very cool concept but poorly executed. Readings rarely align with blood ketone strips. Has frequently registered as "advanced ketosis" when blood ketones are low to moderate. After 2 weeks it constantly needs to be cleaned to the point where it requires multiple 10 minute cleanings after a single test. I rarely leave reviews, even for bad products. But this product has been useless to me.

    No, I would not recommend this to a friend
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