Keyto Breath Sensor - $24 / Month Membership

Join Keyto for just $24 per month (on a 12-month membership)!

Get actionable insights about your body in just one breath. Sustain ketosis & lose weight. Backed by over a decade of science, Keyto offers a new perspective on the popular keto diet. In just one breath, Keyto breaks down everything into an easy-to-understand Keyto Level so you know exactly where you are in relation to your weight loss goals.

• Instant & accurate breath acetone readings
• Easily access actionable insights
• Personalized meal plans
• Delicious and easy keto-friendly recipes
• Stay accountable with the Keyto community

Customer Reviews

Based on 386 reviews
89%
(345)
10%
(39)
1%
(2)
0%
(0)
0%
(0)
S
S.E.
Very cool and super helpful tool!

I love the Keyto! Its very portable and packaged nicely. Its easy to connect to my phone (Android) and easy to use. The warm up takes a while, but that's not a problem for me. Based on what I'm eating and my macro tracker, it seems to be very accurate. Its way more cost-efficient than blood checkers and I find it fun to use! Highly recommend.

j
j.g.
Keyto

Man it’s nice to have a digital monitor. I need to get keri sticks to calibrate to see if this is accurate. Sure is a lot harder to get in to keri’s is than I thought. But now that I’m here I’m gonna stay!

T
T.L.
Easy Keyto to Keto

I love this new innovative tool to let me know when I’m in Ketosis. It is so easy to operate that I bought one for my senior mom to monitor her Ketosis as well. Being in Ketosis is the only way I can keep my diabetes under control. Thank you!

R
R.
Great Product, Very Motivating

Ive been using Keyto since April and I love it! Simple, Effective, and super motivating!!!

A
A.
This Keyto system is Awesome!

I’ve been up and down with weight all my life. Plus or minus 5kg. As I’ve got older it’s been so much harder to lose weight. Tried so many things but this has been incredible. Within 6 days of strictly following the meal plan and really only light exercise (4-5km walk a day), I got my Keyto rating up to 6 and have lost 2kg already. I feel great, sleep well and am not hungry at all. I also just stopped smoking which made it more surprising as I was expecting to put on weight. Highly recommend this easy to follow and actually quite a fun eating plan.

H
H.M.
Science-based, high tech way to monitor ketosis

I have been keto; i.e., following a ketosis-based metabolism diet, for quite some time. I lost over 60 pounds and at 65 years old my health markers show me to be at elite athlete level. For me, the Keyto is just pure convenience as I have used both blood test and "Keto-Stix" (urinalysis) in the past to monitor my ketosis level. The Keyto is just fantastic. You can use it anywhere and as often as you like (the single AAA battery has a phenomenal lifespan!). This is very important to me as I carb-cycle around my fitness regimen. I like to call it 'keto-surfing' because I will dip in and out of ketosis around my workout cycles. I also do a lot of biohacking and the Keyto is just perfect for homing in on exact carb levels for supporting muscle hypertrophy while minimizing lipid storage. I just can't say enough good things about this device.

For people just starting a keto diet with the intent to lose fat, the Keyto diet protocol cannot be beat. No calorie counting, eat until satisfied, easy food labelling (colors) and just good nutrition that includes fiber and micronutrients. The diet could not be simpler and the results are nothing short of spectacular and the Keyto provides that extra incentive to stay the course and drop the weight.

J
J.
Great way to keep yourself in check

It’s a super convenient way to keep track and correlate how food choices affect ketone levels. There are no consumables other than the battery which lasts a long time. Highly recommend for anyone living or trying to live a low carb lifestyle.

R
R.E.
Amazing

Honestly I can’t say enough good things. As someone who has used ketosis for weight loss and lifestyle I love the fact that it lets you know right where you are from the start of your journey on. So when you’re feeling bad in the beginning it’s easy to look at your number and see exactly where you are and it gives you motivation to keep going. The app is incredible, lots of tips and helpful information. It’s easy to use, accurate and so much cleaner than strips. The other testers that use your breath don’t test properly and do not use the proper aspects of your breath for the most accurate reading. All in all, it’s easy, convenient and accurate. What more could you ask for.

d
d.r.
Do yourself a favor and buy this now.

There’s nothing better than instant feedback. I’ve tried many “diets” and stopped because I wasn’t sure if it was “working.” This, however, is science. If you’re eating correctly, the body will do its thing. How do you know if you’re eating correctly, Keyto will tell you. Use the pen and you’ll know instantly if you’re in ketosis and continue to test to make sure you stay there.
The app has tons of recipe ideas. It may sound corny, but it’s fun.

D
D.M.
Best way out there to keep up with your level of ketosis

Every morning I fire this little tool up and check my Keto level. It has really helped me track how my food choices effect my levels. I’m a fan - worth the price.

AS FEATURED IN

Now featuring the Key Eats Program to help you lose weight, improve your health, and feel better.

Track your ketosis in just one breath

The Keyto device breaks down all the data into an easy-to-understand Keyto Level so you know exactly where you are in relation to your weight loss goals.

Eat the foods you love

Stay on track of your keto lifestyle and enjoy the foods you love with our Key Eats Code food and recipe guide.

Expert knowledge and support

Through the Key Eats Program you have access to best-in-class knowledge, support and content to support your lifestyle.

Easy & Intuitive
Accurate & Reliable
Backed by Science
Lose Weight Naturally

Easy & Intuitive

Accurate & Reliable

Backed by Science

Lose Weight Naturally

Choose Your Plan

We designed the Keyto program to do far more than just provide a convenient Keyto Level. Our Keyto Premium membership equips you with everything you need to succeed on your keto diet.

MOST POPULAR

Keyto Premium

$195


  • Keyto Breath Sensor + 1 Year Premium App Access
  • Delicious Key Eats Recipes
  • Personalized Meal Plans
  • MD-Approved Food Guide
  • Access to In-App Groups
  • Comes with a FREE Keyto Food Box ($80 Value!)
  • Device Only

    $99

    Get the Keyto Breath Sensor and a free 30 day trial of Keyto Premium.

    Why Keyto Premium?

    • Delicious In-App Key Eats Recipes
    • Personalized Key Eats Meal Plans
    • MD-Approved Key Eats Code Food Guide
    • Access to In-App Community Groups
    • Comes with a FREE Keyto Food Box ($80 Value!)
    Comes with FREE snack box!

    Equip yourself with everything you need to succeed. Order Keyto Premium today and get a Keyto Low-Carb Food Box ($80 value) absolutely free!

    CHOOSE YOUR PLAN

    Order Keyto Today

    Keyto Breath Sensor

    Keyto Breath Sensor

    Get actionable insights about your body in just one breath. Sustain ketosis & lose weight.

    Customer Reviews

    Based on 386 reviews
    89%
    (345)
    10%
    (39)
    1%
    (2)
    0%
    (0)
    0%
    (0)
    S
    S.E.
    Very cool and super helpful tool!

    I love the Keyto! Its very portable and packaged nicely. Its easy to connect to my phone (Android) and easy to use. The warm up takes a while, but that's not a problem for me. Based on what I'm eating and my macro tracker, it seems to be very accurate. Its way more cost-efficient than blood checkers and I find it fun to use! Highly recommend.

    j
    j.g.
    Keyto

    Man it’s nice to have a digital monitor. I need to get keri sticks to calibrate to see if this is accurate. Sure is a lot harder to get in to keri’s is than I thought. But now that I’m here I’m gonna stay!

    T
    T.L.
    Easy Keyto to Keto

    I love this new innovative tool to let me know when I’m in Ketosis. It is so easy to operate that I bought one for my senior mom to monitor her Ketosis as well. Being in Ketosis is the only way I can keep my diabetes under control. Thank you!

    R
    R.
    Great Product, Very Motivating

    Ive been using Keyto since April and I love it! Simple, Effective, and super motivating!!!

    A
    A.
    This Keyto system is Awesome!

    I’ve been up and down with weight all my life. Plus or minus 5kg. As I’ve got older it’s been so much harder to lose weight. Tried so many things but this has been incredible. Within 6 days of strictly following the meal plan and really only light exercise (4-5km walk a day), I got my Keyto rating up to 6 and have lost 2kg already. I feel great, sleep well and am not hungry at all. I also just stopped smoking which made it more surprising as I was expecting to put on weight. Highly recommend this easy to follow and actually quite a fun eating plan.

    H
    H.M.
    Science-based, high tech way to monitor ketosis

    I have been keto; i.e., following a ketosis-based metabolism diet, for quite some time. I lost over 60 pounds and at 65 years old my health markers show me to be at elite athlete level. For me, the Keyto is just pure convenience as I have used both blood test and "Keto-Stix" (urinalysis) in the past to monitor my ketosis level. The Keyto is just fantastic. You can use it anywhere and as often as you like (the single AAA battery has a phenomenal lifespan!). This is very important to me as I carb-cycle around my fitness regimen. I like to call it 'keto-surfing' because I will dip in and out of ketosis around my workout cycles. I also do a lot of biohacking and the Keyto is just perfect for homing in on exact carb levels for supporting muscle hypertrophy while minimizing lipid storage. I just can't say enough good things about this device.

    For people just starting a keto diet with the intent to lose fat, the Keyto diet protocol cannot be beat. No calorie counting, eat until satisfied, easy food labelling (colors) and just good nutrition that includes fiber and micronutrients. The diet could not be simpler and the results are nothing short of spectacular and the Keyto provides that extra incentive to stay the course and drop the weight.

    J
    J.
    Great way to keep yourself in check

    It’s a super convenient way to keep track and correlate how food choices affect ketone levels. There are no consumables other than the battery which lasts a long time. Highly recommend for anyone living or trying to live a low carb lifestyle.

    R
    R.E.
    Amazing

    Honestly I can’t say enough good things. As someone who has used ketosis for weight loss and lifestyle I love the fact that it lets you know right where you are from the start of your journey on. So when you’re feeling bad in the beginning it’s easy to look at your number and see exactly where you are and it gives you motivation to keep going. The app is incredible, lots of tips and helpful information. It’s easy to use, accurate and so much cleaner than strips. The other testers that use your breath don’t test properly and do not use the proper aspects of your breath for the most accurate reading. All in all, it’s easy, convenient and accurate. What more could you ask for.

    d
    d.r.
    Do yourself a favor and buy this now.

    There’s nothing better than instant feedback. I’ve tried many “diets” and stopped because I wasn’t sure if it was “working.” This, however, is science. If you’re eating correctly, the body will do its thing. How do you know if you’re eating correctly, Keyto will tell you. Use the pen and you’ll know instantly if you’re in ketosis and continue to test to make sure you stay there.
    The app has tons of recipe ideas. It may sound corny, but it’s fun.

    D
    D.M.
    Best way out there to keep up with your level of ketosis

    Every morning I fire this little tool up and check my Keto level. It has really helped me track how my food choices effect my levels. I’m a fan - worth the price.