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CutEngine is an iOS app that uses machine learning and your Apple Watch data to calculate personalized, daily-adjusted calorie and macro targets for fat loss phases. Instead of a static number from a formula, your targets adapt as your body responds.

CutEngine is currently in development. Join the waitlist on our homepage to be notified as soon as the app is available on the App Store.

An Apple Watch is strongly recommended for the best experience — it automatically provides steps, workouts, sleep, and HRV data. However, CutEngine can still work with manually entered data if you don't have one.

CutEngine reads steps, active energy, workouts, sleep duration, heart rate variability (HRV), and resting heart rate. All data stays on your device and is never sold or shared with third parties.

After 14 days of tracking your weight, intake, and activity, CutEngine builds a personal model of your metabolism. It learns how your body responds to different calorie levels and adjusts your daily targets accordingly — getting more accurate over time.

Yes. CutEngine processes your health data on-device. We do not store, sell, or share your HealthKit data. See our Privacy Policy for full details.

Pricing will be announced closer to launch. Join the waitlist to be the first to know about pricing and any early-access offers.

CutEngine recognizes that people on TRT, GLP-1 medications, peptides, or other protocols respond differently to calorie deficits. Enhancement tiers adjust deficit strategies and safety thresholds based on your situation.