Comparison

KetoAir vs MetFix

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

KetoAir

This device and companion app help you monitor your body's fat-burning status by measuring acetone levels in your breath. Get instant, accurate results to understand how your diet and exercise affect your ketosis.

Highlights
  • Instant breath acetone measurement
  • Accurate real acetone sensor
  • Bluetooth device connectivity
  • Log ketosis records
  • Monitor fat-burning status
  • Track diet and exercise impact
Features
Read full description

KetoAir is a breathlayzer that provides accurate and instant results in just a single blow. KetoAir Breathlayzer: •Accurate, real acetone sensor •Quick and easy - Just a single blow, get the result in seconds •Test anytime and anywhere •Keep yourself monitored and motivated, helping you to sustain your perseverance KetoAir App: •Log your ketosis record •Connect the device via Bluetooth Introducing the KetoAir Breathalyzer - the perfect tool for health and wellness conscious individuals who are looking to optimize their ketosis state and body fat burning rate! This pocket-sized breathalyzer provides accurate and instant results in just a single blow, giving you the ability to monitor how different foods affect your ketone level. By measuring the level of acetone in your breath, which is produced by the liver during the process of ketone energy formation, you can determine your body's fat burning status and adjust your diet accordingly. Without pain, you can test your ketone levels anytime and anywhere, keeping yourself motivated to reach your optimal ketosis state and fat burning rate. Plus, breath acetone levels can be influenced by certain body measurements, such as body composition and exercise, giving you even more insight into your overall health and wellness. No more guessing on your body's fat burning potential. Take control of your health and wellness with the KetoAir Breathalyzer. Check out the weight management reference article to learn more about how breath acetone and body measurements are related and how you can optimize your ketosis state for maximum fat burning potential. Disclaimer: Always seek a doctor’s advice in addition to using this app and before making any medical decisions. The KetoAir device has registered with the U.S. Food and Drug Administration as Class 1 medical device. Weight management reference article: https://onlinelibrary.wiley.com/share/7GUVTR5WWPWNCY9KPIYE?target=10.1002/oby.21242

About

MetFix

Features
Read full description

Transform your health journey — all in the MetFix app Your Daily Fix: Belly, Body, Brain Track Macros, do your workouts, compete in challenges, and read more about the science behind both your longevity and performance. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

KetoAir4 screens
MetFix4 screens

Verdict

The call

The clearest difference is in-app purchases: KetoAir at none against MetFix's 4. MetFix's advantage is update cadence (every 4 days vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. MetFix sells 4 one-off in-app purchases. KetoAir asks for nothing beyond the download.

UpkeepUpdate frequency

KetoAir ships an update every 2 months, MetFix every 4 days. The most recent releases landed on October 6, 2026 and October 22, 2026 respectively.

Scorecard2 real differences · 7 level
KetoAir versus MetFix: the parameters behind the verdict, then further details
ParameterKetoAirMetFix
PriceFreeFree
Rating1.5 (2 ratings) — better—
Number of ratings2 — better—
Update frequencyEvery 2 monthsEvery 4 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS16.416.4
Further details — not scored
Size60 MB84 MB
Age rating4+17+
DeveloperQi Diagnostics LimitedBreak Even Productions

In-app purchases

None

KetoAir

No in-app purchases

4 purchases

MetFix

One-time4
  • Critical Thinking Courses$150.00
  • Diabetes Course$150.00
  • Fit For Duty Course$350.00
Show 1 more
  • MetFix Essentials Course$500.00

Questions

Is KetoAir free?
KetoAir is free to download, with no in-app purchases.
Is MetFix free?
MetFix is free to download, with in-app purchases available.
Do KetoAir or MetFix have ads?
Neither KetoAir nor MetFix shows ads.
Which is updated more often, KetoAir or MetFix?
KetoAir ships an update every 2 months, and MetFix every 4 days. Most recently, KetoAir was updated on October 6, 2026 and MetFix on October 22, 2026.

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