In-Depth Keyto Review in 2024 (Best Value for Money)

This is my review of the Keyto pen. I have been regularly on and off keto for over 7 years now, and here’s my experience.

Keyto is an all-in-one weight loss solution that helps you measure your levels, guides you on what to eat and what to avoid, and keeps you motivated through the community.

This makes it the perfect tool for keto beginners and anyone wanting a lot of value for money. In this Keyto review, I will analyze the product, its accuracy, drawbacks, and alternatives.

Let’s get started!

We Recommend

• How does it work
• Accuracy
• Ease of use
• App
• Price
• Drawbacks
• For whom is it for
• Alternatives

How Does Keyto Work?

The Keyto breath sensor, often called a keto pen, is part of a full weight loss program. 

It’s a modern way to measure if you are in ketosis or not. You can finally stop pricking your finger several times a day.

You just breathe into the keto detector, and it measures the acetone in your breath. Acetone is a byproduct of your body making ketones. 

The result is sent to a mobile app and shown as levels. If you have a high Keyto Level, that means you’re likely in ketosis. 

Keyto Level	Ketosis	Energy Source
1-3	Not in ketosis	Carbs
4	Light ketosis	Fats and carbs
5-6	Full ketosis	Fats
7-8	Deep ketosis	Fats

Keyto has developed its own scale for ketosis levels. Levels 1-3 mean you’re not in ketosis and your body is using carbs for energy. 

Level 4 is light ketosis, where your body is using both carbs and fats. Levels 5-6 are full ketosis, meaning your body is using fats for energy. 

Anything above 6 is deep ketosis, which is also fueled by fats. To increase your ketosis levels, eat fewer carbs, more fat, and a moderate amount of protein. 

How Accurate is Keyto?

The Keyto breath meter is specifically designed to detect breath acetone from nutritional ketosis, showing if you’re on track with your keto diet or not. 

• Each Keyto sensor is carefully calibrated using certified standard acetone gas and prepared through a precise process. 
• Each sensor is stabilized individually and then calibrated with varying concentrations of standard acetone gas. 
• They do rigorous testing and validation through human tests which results in a device that performs extremely well in detecting nutritional ketosis.

Long story short, this means that the device just works and gives you a simple answer.

Protip: Biosense meter offers the most accurate breath readings. Keyto is perfect if you are a beginner or looking for value for money.

I’ve been using Keyto actively for over a year now, and I can say that my experience has been pretty positive. 

Sure, the beginning was a bit tricky. I had to figure out the right times of the day to use it and nail down a consistent breathing technique. But once I got those down, my readings became a lot more accurate and consistent. 

I also noticed that my Keyto scores were closely linked to my blood readings. If my blood test showed a value between 0.6-1mmol/L, my Keyto level was usually a 4 or 5. 

And higher blood ketone levels between 1 and 1.5mmol/L would score a Keyto 5 or 6. The highest Keyto reading I’ve gotten was a 7, which was when my blood ketone levels were between 1.6-1.8mmol/L. 

I guess if my blood reading ever hits 2mmol/L or more, I might just see that elusive Keyto 8.

Tips to Get Accurate Readings Consistently:

1. Always wait the full minute until the device is calibrated, don’t breathe into the device before.
2. Always measure during the same times of the day. This is important as the acetone levels fluctuate during the day, e.g. after training, it’s lower.
3. Always breathe in with consistent pressure and evenly, or you get artificially low scores. I had a stuffy nose, which made it difficult to exhale and gave me a level of 2, despite my blood ketone levels being 1.5 mmol/L.
4. Another trick s to reach the end of your breath at the end of the 10 seconds because your acetone levels are most accurate at the end of your breath, not at the beginning. 

Is Keyto Easy to Use?

I really appreciate the simplicity of the device. 

You just have to download the Keyto app from the Apple Store or Google Play, then connect the device using Bluetooth. The keto pen pairs easily and just works out of the box.

The only hiccup in the process is the app’s introduction. It took me a while to accept all the info and click ‘next’ like a 100 times. This got old really fast. 

I believe this could be simplified to a two-click process instead of taking nearly 12 minutes. 

How to Get a Reading:

1. Open the Keyto app + tap new reading (2 seconds)
2. Turn the Keyto device on and tap connect (<5 seconds)
3. Wait for the Keyto meter to warm up (~1 minute)
4. Breathe into the Keyto pen (10 seconds)
5. Read your results (5-10 seconds)

Keyto device warms up (calibrates) about 50-60 seconds each time. It felt okay the first time I got the device, but now it just feels so annoying. 

The device contains a nanosensor that requires heating to 400 degrees C (752F) to produce the best results. So it’s a necessary evil, but it’s still 100 times better than urine strips.

Keyto App

The Keyto App is a super helpful tool for anyone on a keto diet. It’s like a guidebook, a planner, and a coach all in one. 

You can track your progress with a detailed measurement history and find tons of delicious recipes to keep your meals interesting. 

The personalized meal plan is the real differentiator from other breathalyzers. In addition to measuring ketosis, it also takes all the guesswork out of what to eat. 

Plus, there’s a food guide to help you figure out what’s keto-friendly and what’s not. The community feature is my favorite part. 

It’s great to connect with others who are on the same journey. For example, there’s even a “Trader Joe’s 5 day meal plan”. How convenient is that?

I like that the Keyto App is like my all-in-one weight loss solution. That’s why I believe you get a lot of value for the money. 

Keyto Price

So, how much does Keyto cost? There are two options: the breathalyzer itself and an optional premium monthly subscription. Here’s what you get. 

Keyto Breath Sensor

The Keyto ketosis pen is available exclusively on the company’s website for just $99. And here’s what you get in the package.

Keyto Device + Free App: $99

• The ketosis pen
• 4 mouthpieces
• A user manual
• A carrying case
• AAA battery

The base price offers a lifetime access to read and understand your ketone levels. You can also use the free part of the Keyto app for additional support. 

Is Keyto Breath Analyzer Worth the Money?

In my opinion, the Keyto pen, along with the free app, provides great value for money, especially for those new to the keto diet. 

While the upfront cost might seem a bit high, it’s a good value in the long run. 

You won’t need to keep buying test strips, so if you plan on checking your ketosis level regularly, you’ll definitely save money over time. 

So, if you’re looking for a balance between accuracy, frequency, and affordability, the Keyto is a great choice. 

Keyto Premium 

The Keyto Premium subscription service offers three plans, from monthly to annual payments.

Membership	Price	Initiation Fee	Includes Free Keyto
1 Month	$49 /month	$0	No
1 Month	$49 /month	$99	Yes
1 Year	$29 /month	$0	Yes

• The first plan is $49 per month which unlocks only the premium part of the app.
• The second plan is $49 per month with a $99 initiation fee and includes a free Keyto pen plus unlocking the premium content. 
• The third plan is billed annually at $29 a month and also comes with a free Keyto pen plus unlocks the premium content.

Each Keyto premium plan includes access to a 16-week course plan, exclusive keto recipes, restaurant guides, and a list of keto-friendly foods called the “Keyto Code.” You also get priority support and other perks. 

There are also custom perks and offers that change from time to time, but offers are like this:

• If you sign up for $49 per month with a $99 initiation fee and a free Keyto pen, you will get 1st month free.
• If you sign up for $29 a month for 1 year plus a free Keyto pen, you save -40%.

Is Keyto Premium Subscription Worth the Money?

I truly believe the Keyto Premium Subscription is worth the money, especially if you’re serious about losing weight and appreciate having an all-in-one solution. 

It saves you from spending countless hours researching the right diet and lifestyle. The convenience factor is huge, as you get food lists and all necessary tools right at your fingertips. 

• However, if you’re new to ketosis or a seasoned ketoer who doesn’t need support, the subscription might not add much value. 

• Beginners should first try to achieve ketosis without spending extra money, and pros probably won’t find much new information. 

The yearly $29 price tag is quite reasonable, provided you actually use it. Yet, the free version with the app and the Keyto Pen could work just fine for most folks. 

Keyto Drawbacks

For the most part, Keyto is awesome and offers a lot of value for the money.

But during my Keyto breath sensor review, I found several problems that bugged me a lot.

1. No Device Screen

One of its drawbacks is that it doesn’t have a screen. I find this a bit inconvenient because I need to check my phone first thing in the morning to get my ketosis reading. 

I like to avoid screens for the first part of my day, so it would be easier and quicker if the device itself could show the reading. 

This way, I could immediately know my ketosis level without having to use my phone. So, if you’re like me and prefer a screen-free morning, you might want to consider Biosense instead.

2. Long Warmup Time

Another issue I’ve noticed with the Keyto breath sensor setup is the warm-up time. Each time I switch on the Keyto pen, it needs about a minute to heat up. 

Initially, it didn’t bother me much. But after a few uses, it started to feel a bit annoying. 

It’s understandable, though. The device has a nanosensor which needs to heat to a significant 400 degrees C to give the most accurate results. 

Although it can be inconvenient, especially on busy days, it’s still way better than using urine strips. 

This warm-up issue is common in all breath sensors, not just the Keyto device. So, while it’s a bit of a pain, it’s something we have to deal with if we want accurate ketosis readings. 

3. Alcohol Causes False Readings

Another interesting drawback is that its readings can be thrown off by alcohol. Even a small amount of alcohol in your breath, like from a hard seltzer, can cause the sensor to give a high reading. 

This is because the alcohol level in your breath after just one drink can be 10 to 100 times greater than the acetone level. 

So, if you’re planning to have a drink, it’s best to take your Keyto measurement beforehand. That way, you’ll get a more accurate reading of your ketosis level. 

If you drink and then take a measurement, your score could be a lot higher than it really is. But don’t worry, it’ll go back to normal by the next day. 

So, remember, for the most accurate results with your Keyto breathalyzer, avoid taking readings within 8-12 hours of drinking alcohol. 

4. Less Precise Than Blood Testing

Using the Keyto pen is pretty straightforward, but remember that it’s not as precise as a blood test with something like the Fora 6 Connect. 

Blood tests are still the gold standard when it comes to measuring ketones. 

So, even though the Keyto meter is handy and easy to use, it might give slightly different readings on different days. 

For example, you might get a Keyto Level of 5 one day, but a 6 the next day, even though your blood ketone level hasn’t changed. 

But the variation is more related to how consistent are you with your measurement’s and how you do it, not that the device isn’t working properly. It’s very sensitive to your input.

If getting the most accurate and consistent ketone readings possible, then check out the best blood meters instead.

5. Messy Homepage

One thing that really bugged me about the Keyto brand was the confusion I faced on their homepage. 

I was looking for basic stuff like a phone number, an email address, shipping details and refund information, but they were nowhere to be found. 

It was like playing hide and seek, having to sift through heaps of content just to find a page where I could even raise a ticket. 

Sure, it’s not a huge deal, but it’s kind of annoying, you know? 

The good thing is that  if you opt for the premium subscription, you do get priority support, so all your queries get answered pretty fast. 

For Whom is Keyto For?

Keyto is a fantastic tool designed for anyone who are just starting their weight loss journey and are serious about shedding some pounds. But it’s not for everyone.

Keyto is for you if:

• You are a keto beginner serious about losing weight and want an all in one solution from measuring ketones to ketogenic recipes to food lists to community.
• You are looking for value for money, because the ketosis meter + the free app works for most people and offers a lot of value for the one time price and saves you a lot of money in the long term compared to urine strips or blood monitor testing strips.

Keyto is NOT for you if:

• You need the most precise readings when on the go, then Biosense reader is better, or if you also want to measure bloood glucose levels, then go for a blood meter like Fora 6 instead.
• If you haven’t been ever in ketosis. Sure you get value from this but experience shows that you should first try the keto diet and then invest some money if you know you are serious about this.

Keyto Alternatives

Here are the best alternatives to the Keyto reader based on specific use cases. All of them are good products for doing certain things very well.

1. Lumen – Best for low-carb diets

Lumen is best metabolism tracker for low-carb dieters. It’s similar to Keyto, but you can lose and track your fat burn without the restrictive ketogenic diet. 

2. Biosense – Most accurate breath meter

Biosense is the most accurate ketone breath analyzer out there. It’s an FDA 1 class medical device and has a screen, so you don’t need to use a smartphone first thing in the morning.

3. Fora 6 Connect – Best blood ketone meter

Fora 6 Connect is the gold standard in ketone and glucose blood measurements. It provides you with the most accurate readings every time.