Key to Health: Metabolic AI

Keyto, Inc.

About this app

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.

Read more about our terms and conditions here:
Terms of service: https://keytohealth.ai/terms
Privacy policy: https://keytohealth.ai/privacy

Ratings and reviews

I opened my app yesterday to check my ketones and found they had changed the app. The new app is a disaster in comparison to the old. It is total clutter. I just need bare bones, no fluff, like the old one. All I need is to check my ketones and chart them. Now I check and write the results on a piece of paper for easy reference. Why make it so inconvenient? I have used Keyto for almost 3 years but it may be time to move on.

For the money, the device and app flat out suck. The recipes are good, the podcasts are informative, and the device seems to read right when it works (but who really knows?) otherwise, nothing good to say. The ads promise an online community...nope. You can't use the device without purchasing the app to the tune of $100 per year above the 100 or so you pay for the device itself. Totally deceptive advertising. Glitchy as hell, always having to uninstall/ reinstall and NO TECH SUPPORT/ CS!

This app worked for 1 day. Multiple updates and no fixes. Then it warms up and stays at 6% for a half hour with no way to shut down the app without restarting the mobile device. Never goes to 100%. Sometimes 6 sometimes 24 but never more. Surprise, blow. Most of the time when it finally takes a score it says "Oops sonething went wrong". And you dont need GPS location permissions to find bluetooth. This is a JUNK product with a junk app. Stay away.

What’s new

Bug fixes and stability improvements