---
title: "Key to Health: Metabolic AI - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "Finally understand what's working for your body—no guesswork, no gimmicks.  Key to Health is designed for high-achieving, busy people who want to look better, feel better, and optimize their long-term"
---

# Key to Health: Metabolic AI — United States
> Your metabolism, optimized

![Key to Health App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/ee/7e/16/ee7e1663-206e-12b9-60f8-ee86ef967504/AppIcon-0-0-1x_U007epad-0-1-0-sRGB-85-220.png/400x400bb.png)

**Developer:** [Keyto](https://apptail.io/developer/keyto-owGc)
**Category:** Health Fitness
**Rating:** 4.8/5 (2,255 ratings)
**Price:** Free
**Bundle ID:** com.getkeyto.Keyto
**Store:** Apple App Store
**Country:** United States
**Version:** 4.0.10 (released 2026-10-05)
**Original Release:** 2019-02-08

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id1441365703)
**AppTail Page:** [https://apptail.io/app/key-to-health-metabolic-ai-LTHb/united-states](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/united-states)

## Key to Health Description
Finally understand what's working for your body—no guesswork, no gimmicks.

Key to Health is designed for high-achieving, busy people who want to look better, feel better, and optimize their long-term health without spending hours on complex routines.

Backed by science. Guided by AI. Built for real life.

Our breath sensor gives you real-time feedback on your body's fat metabolism—so you can see what your daily choices are actually doing, not just hope for the best. Pair that with smart AI coaching, and you have a system that adapts to you.

What you'll get:
• Real-time fat metabolism tracking with our breath acetone sensor
• Personalized coaching from Key, your AI health guide
• Clear, science-based goals and progress tracking
• Tools to build strength and support long-term health
• Eat what you love—no restricted foods, no keto required

Meet Key: Your 24/7 AI Coach
Key learns from your habits, adjusts your plan, and guides you every step of the way. Instant support and personalized guidance, whenever you need it.

Grounded in clinical evidence. In a published clinical trial, participants following the Key to Health program lost an average of 10% total body weight over 48 weeks.

No fad diets. No extreme routines. No forbidden foods. Just real progress, made easy.

This app and breath monitor are for adults 18 years and older.

Subscription pricing and terms:
Key to Health offers an auto-renewing monthly subscription at $49.99/month to provide you with unlimited access to the Key to Health Premium collection while you maintain an active subscription.

Payment will be charged to your Apple Account when you confirm the initial subscription purchase. Subscriptions automatically renew unless auto-renew is turned off at least 24 hours before the end of the current subscription period. Your account will be charged for renewal within 24 hours prior to the end of the current period at the current subscription price. You may manage your subscription and turn off auto-renewal by going to Settings > Manage Subscription on your device after purchase. Any unused portion of a free trial period, if offered, will be forfeited when you purchase a subscription, where applicable.

Read more about our terms and conditions here:
Terms of service: 
Privacy policy: 

## Key to Health Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/90/c3/69/90c369d3-3bd2-9dc2-d831-fcf89cba71a2/iPhone_17_Pro_Max-01Dashboard.png/320x480bb.jpg)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/3e/3e/44/3e3e44e7-584d-73ca-4e47-49cdd09bc504/iPhone_17_Pro_Max-02Journal.png/320x480bb.jpg)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/c1/e3/f8/c1e3f8e1-8f90-8712-ebc0-390062fe2aa1/iPhone_17_Pro_Max-03Journey.png/320x480bb.jpg)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/4e/4a/90/4e4a904c-6cf0-ac37-ddd5-00fa780bbcba/iPhone_17_Pro_Max-04Measuring.png/320x480bb.jpg)

## Key to Health Rating Breakdown in United States
- 5 stars: 1,876 (84%)
- 4 stars: 264 (12%)
- 3 stars: 35 (2%)
- 2 stars: 17 (1%)
- 1 stars: 42 (2%)

## Key to Health Reviews in United States

### ***** "The key to keto is Keyto"
Great app very easy to use and with the ketone breath meter every just works.  Very well setup to ensure you succeed.  Love this app.
-- DominicanReview, 2024-11-17

### ***-- "Great for measuring levels"
Another app hawking an overpriced subscription, but the measurement tool works great. I’ve had it for nearly a decade. No complaints on the hardware.
-- TJ & CJ, 2024-10-02

### *---- "Will stop working right away"
I’ve used this device maybe 10-15x and now it never works. I uninstalled and reinstalled the app, made sure the battery was replaced with a new one. It takes FOREVER to warm up, and will get to the end and fail. I’m talking 3-4 mins of warm up just to have it fail and you have to start over. It wasn’t terribly annoying when I had to do it 1-2x before I could blow into it. Now I can do it 5x in a row and it never connects. Total waste of money. I should have spent more and gotten a lumen.
-- Donye1983, 2024-08-16

### ***** "Couldn’t be happier with Keyto meter"
I’ve had the Keyto for several years and it works flawlessly every time. It’s helped me stay on track and motivated. Highly recommend!
-- rdcrna, 2024-05-15

### **--- "Never buy a Premium subscription for 2 months."
First- 
When purchased the app, It was promised with Premium subscription for 2 months that within one week of active participation and learning provided lessons, you get a Keto monitor to measure your ketones. I didn’t get it at all. You will have to buy it separately for 99.99$. 
Second-
The customer service was very bad. It literally took one or two days for them to reply using litter one general sentence and not addressing a particular concerns at all. Unfortunately, customer service was not interested in helping out or explaining details. If it was at least supportive conversation or willing to figure out something or explaining something important to a customer, I wouldn’t write bad review at all, because the app by itself is very informative and very well structured.
-- Кекти, 2024-02-01

### ***** "Learning Curve"
Learning how to achieve proper macro balance with healthy, sustainable food choices takes focus and effort. However…figuring this out for yourself is key to ongoing success. Down 43lbs.
-- Jmf911, 2023-09-01

### ****- "Enjoying the breath sensor."
Despite what some have said I have found it to be generally accurate. It may not always be what I want to hear but it lets me zero in eating for a higher result. Better than strips for sure.
-- avidalone, 2023-08-18

### ***** "iPhone 13 pro max"
This is high one of the rarest lowest cost point consistent and accurate device I recommend. I have several devices to double check its calibration and it’s always consistent. Do yourself a favor support this company.
Dr. MA
-- I/love, 2023-04-29

### ***-- "Device v App"
I love the device, it is really making a difference for me to be able to see my Ketone levels.  The app is OK. It shows you the level your device is reading and coaches you on when to breathe.. As far as tracking food intake, I prefer Carb Manager, which unfortunately, only interfaces with a different keto breath analyzer
-- Christine Taylor Kight, 2023-03-25

### *---- "Can’t use the breathalyzer without $50/mo membership"
As others have said, the dietary tracking lists are minimal and cumbersome to use. “Coaching” is canned messages pushed out in response to some activity in the app. I haven’t received a “coaching” message since the day I stopped recording in the app few weeks ago - I’d have expected some sort of encouragement to continue. There’s no way to contact anyone for coaching support within the app and you can’t reply to the messages you receive. I’d pay something other than $50 to be able to keep using the breathalyzer without the other aspects of the app, but there’s no option for that. $100 breathalyzer and $50 1 month membership down the drain.
-- kittycatpilot, 2023-03-18

[View all Key to Health reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews)

## Key to Health In-App Purchases
| Item | Price |
|------|-------|
| Keyto Annual Subscription | $95.99 |
| Keyto 1 Month Subscription | $49.99 |
| Keyto 2 Month Subscription | $99.99 |
| Keyto Monthly Subscription | $14.99 |


## Key to Health Discovered Keywords
- keto
- low carb
- keyto
- keto program

## Apps Similar to Key to Health
- [Hip2Keto: Keto Recipes](https://apptail.io/app/hip2keto-keto-recipes-UVt/united-states)
- [Stupid Simple Keto Diet App](https://apptail.io/app/stupid-simple-keto-diet-app-ncG/united-states)
- [Keto Diet for Beginners](https://apptail.io/app/keto-diet-for-beginners-pcG/united-states)
- [Keto Diet App: Keto Manager](https://apptail.io/app/keto-diet-app-keto-manager-rcG/united-states)
- [KetoDiet: Fasting & Meal Plans](https://apptail.io/app/ketodiet-fasting-meal-plans-iNL/united-states)
- [Biosense by Readout](https://apptail.io/app/biosense-by-readout-uQM/united-states)
- [inKeto: Keto Tracker App](https://apptail.io/app/inketo-keto-tracker-app-cApb/united-states)
- [KETOSCAN](https://apptail.io/app/ketoscan-Ndsc/united-states)
- [Keto Diet App ⓒ](https://apptail.io/app/keto-diet-app-mlZc/united-states)
- [My Keto Scanner: Carb Checker](https://apptail.io/app/my-keto-scanner-carb-checker-yPRd/united-states)

## Key to Health Available In
- [United States](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/united-states)
- [Canada](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/canada)
- [Australia](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/australia)
- [United Kingdom](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/united-kingdom)
- [Netherlands](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/netherlands)
- [Germany](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/germany)
- [Spain](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/spain)
- [Belgium](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/belgium)
- [Japan](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/japan)
- [Hong Kong SAR China](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/hong-kong)
- [Sweden](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/sweden)
- [Singapore](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/singapore)
- [Switzerland](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/switzerland)
- [New Zealand](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/new-zealand)
- [Norway](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/norway)
- [South Korea](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/south-korea)
- [Romania](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/romania)
- [Italy](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/italy)
- [France](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/france)
- [Taiwan](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/taiwan)
- [United Arab Emirates](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/united-arab-emirates)
- [Denmark](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/denmark)
- [Hungary](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/hungary)
- [Russia](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/russia)
- [India](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/india)
- [Mexico](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/mexico)
- [Israel](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/israel)
- [Austria](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/austria)
- [Poland](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/poland)
- [Portugal](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/portugal)
- [Ireland](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/ireland)
- [Thailand](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/thailand)
- [Finland](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/finland)
- [Malaysia](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/malaysia)
- [Slovakia](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/slovakia)
- [Slovenia](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/slovenia)
- [Czechia](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/czechia)
- [Saudi Arabia](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/saudi-arabia)
- [Egypt](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/egypt)
- [Argentina](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/argentina)
- [Chile](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/chile)
- [Bulgaria](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/bulgaria)
- [China](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/china)
- [Luxembourg](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/luxembourg)
- [Colombia](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/colombia)
- [Lithuania](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/lithuania)
- [Panama](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/panama)
- [Brazil](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/brazil)
- [Türkiye](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/turkey)
- [Ukraine](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/ukraine)
- [South Africa](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/south-africa)
- [Peru](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/peru)
- [Indonesia](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/indonesia)
- [Senegal](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/senegal)
- [Armenia](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/armenia)
- [Azerbaijan](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/azerbaijan)
- [Bahrain](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/bahrain)
- [Bermuda](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/bermuda)
- [Brunei](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/brunei)
- [Belarus](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/belarus)
- [Cyprus](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/cyprus)
- [Dominican Republic](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/dominican-republic)
- [Algeria](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/algeria)
- [Ecuador](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/ecuador)
- [Estonia](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/estonia)
- [Greece](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/greece)
- [Croatia](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/croatia)
- [Iceland](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/iceland)
- [Jamaica](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/jamaica)
- [Jordan](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/jordan)
- [Kenya](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/kenya)
- [Kuwait](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/kuwait)
- [Cayman Islands](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/cayman-islands)
- [Kazakhstan](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/kazakhstan)
- [Lebanon](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/lebanon)
- [Sri Lanka](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/sri-lanka)
- [Latvia](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/latvia)
- [Madagascar](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/madagascar)
- [North Macedonia](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/north-macedonia)
- [Macao SAR China](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/macau)
- [Malta](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/malta)
- [Namibia](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/namibia)
- [Nigeria](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/nigeria)
- [Nepal](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/nepal)
- [Oman](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/oman)
- [Philippines](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/philippines)
- [Pakistan](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/pakistan)
- [Qatar](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/qatar)
- [Tunisia](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/tunisia)
- [Uganda](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/uganda)
- [Uzbekistan](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/uzbekistan)
- [Vietnam](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/vietnam)
- [British Virgin Islands](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/british-virgin-islands)
- [Grenada](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/grenada)
- [Uruguay](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/uruguay)
- [Angola](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/angola)
- [Paraguay](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/paraguay)
- [Honduras](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/honduras)
- [Ghana](https://apptail.io/app/key-to-health-metabolic-ai-LTHb/ghana)

---

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