Measure What Matters
Built in limited production runs. Preorders ship in the order received, so the sooner you order, the sooner yours ships.
Estimated to ship by January 2027
Limit 1 per order
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You’ll be charged when you preorder.
Understand how food, fasting, exercise, and daily habits affect your metabolism with real-time breath acetone tracking and app-connected insights, all without needles, strips, or disposable testing supplies.
Designed for you if you’re focused on keto, fasting, fat-burning, metabolic flexibility, athletic performance or improving your metabolic health, the Keto-Mojo Breathalyzer uses advanced photoacoustic spectroscopy to measure acetone in your breath in seconds. Test on demand throughout the day and turn your readings into actionable insights with the MyMojoHealth app.
01 / EFFORTLESS TESTING
A non-invasive way to measure breath acetone
02 / FAST RECHARGING
03 / ON-THE-GO TESTING
04 / NO CONSUMABLES
The science behind the reading.
UV light focuses through a lens to target acetone molecules.
Acetone absorbs the pulsed UV light and becomes excited.
The absorbed energy is released as heat, creating tiny pressure waves.
A highly sensitive acoustic sensor picks these up and converts them into an acetone reading.
Unlike MOX sensors, which depend on surface chemical reactions that can drift over time, photoacoustic sensing measures acetone by how it absorbs light, for more selective and stable readings.
Full measurable concentration range of the sensor.
*Estimated, depending on the starting temperature
1880: Alexander Graham Bell demonstrates the photoacoustic effect: modulated light can produce a measurable response.
Today: Modern UV light sources, sensing, signal processing, and miniaturization allow us to apply the same fundamental physical principle to breath acetone measurement.
Whether you use a Continuous Glucose Monitor (CGM), a ring, or watch, MyMojoHealth works with many popular health platforms so your data fits into your overall wellness picture.
Measure What Matters
Integrations
Share Your Data
Move beyond single snapshots. Your data becomes more powerful over time. The MyMojoHealth companion app helps you understand what works for your body.
Support your metabolic health with the help of a like-minded group - all inside one simple app.
Connect with people living keto and low-carb every day.
Get the basics down before your device arrives.
Join conversations that match your goals.
Evidence-based answers from RDs in the community.
Show up, say hi, stay on track.
Everything you need to know about the Keto-Mojo Photoacoustic Breathalyzer.
The Keto-Mojo Breathalyzer is a limited production preorder, shipped in the order it is received. The “Estimated to ship by” date at the top of this page and in your cart shows the latest timing, and we’ll email you if it changes. You pay when you place your order. You can cancel for a full refund until 4 PM Pacific (7 PM Eastern) on the business day before it ships.
The Breathalyzer uses UV-C photoacoustic spectroscopy, which means it measures acetone in your breath using light and pressure waves. When you exhale into the device, your breath fills a small measurement chamber. Then:
Because it measures acetone by how it absorbs light, rather than through surface chemical reactions that can drift over time (as MOX sensors do), photoacoustic sensing gives more selective and stable readings. It’s also designed for repeated measurements and uses no disposable sensors, strips, or patches.
Learn more in Photoacoustic Technology.
Readings are accurate to ±(1 ppm + 10% of the reading). At 10 ppm, that’s within ±2 ppm. At 50 ppm, within ±6 ppm.
Anyone who wants to see how their eating, fasting, or training choices show up in their body, without using a needle. Whether you’re following keto or low-carb, fasting, training as an athlete, or just curious about your metabolic health, a quick breath test at home helps you spot patterns over time and stay consistent with your routine.
Learn more in Monitor My Ketogenic Lifestyle or Fasting Routine.
It tells you that your body is making ketones, which happens when it’s using fat for fuel. More acetone in your breath generally means more ketones have been produced.
Learn more in Breath Acetone.
Only to get started. Download the free MyMojoHealth app and connect your Breathalyzer to set it up and take your first measurement. The app works on both iOS and Android. After that, you can test without your phone or an internet connection. Your results show on the device and in the app, and we recommend using the app for the best experience.
Your Keto-Mojo Breathalyzer comes with:
Your preorder also includes free trial access to Community by Keto-Mojo. See below for details.
Yes. Community by Keto-Mojo is an online community you can join from your phone or computer, where you can connect with others, join discussion groups and live calls, learn from recorded lessons by an expert dietitian, and stay motivated with monthly group challenges.
Your preorder includes two kinds of free access:
We’ll email you instructions to get started. If you didn’t join while you were waiting, you can still start your 30 days when your Breathalyzer arrives. After that, membership continues at $19.49/month unless you cancel.
No. The Keto-Mojo Breathalyzer is a wellness device for lifestyle tracking, not a medical device. It isn’t intended to diagnose, treat, or monitor any medical condition. For questions about your health, talk with your healthcare provider.
You can return an unopened Breathalyzer in its original, sealed packaging within 30 days of delivery. Contact our customer support team first to get a Return Authorization Number and return instructions. A flat-rate return shipping fee is deducted from your refund. If your order hasn’t shipped yet, you can cancel it for a full refund until 4 PM Pacific (7 PM Eastern) on the business day before it ships. See our refund policy.
Yes. Your Keto-Mojo Breathalyzer comes with a one-year limited warranty that covers manufacturing defects, starting from the delivery date. If something isn’t working as expected, contact our customer support team. We’ll help you troubleshoot, check whether your device is covered, and arrange a replacement if we confirm a covered defect. This warranty is in addition to your statutory rights and doesn’t limit them. See our warranty page for details.
Yes, shipping is free in the US. The specific delivery dates shown at checkout are counted from the day you order, so they don’t apply to preorders. The delivery timeframe for your shipping method (for example, 3 to 5 business days) does apply, starting once your order ships. We’ll email you tracking when it does.
