Prevyu: AI Body Fat Scanner
Rate My Physique & FFMI
Only for iPhone
Free · In‑App Purchases
iPhone
New: connect Apple Health and see the workouts, steps and food behind every check-in. Snap one photo for an AI body fat estimate and muscle index (FFMI).
Snap one photo and get an AI estimate of your body fat percentage, muscle index (FFMI) and shoulder-to-waist ratio in seconds. Then check in each week and watch those numbers move toward the physique you choose.
Prevyu is a body fat scanner and physique tracker in one. The first reading shows where you are. Every check-in after it shows whether your cut, bulk or recomp is working.
ONE PHOTO, A FULL READING
Take a photo in good light and Prevyu draws the shoulder and waist guides on it, then estimates your body fat percentage, muscle index (FFMI) and shoulder-to-waist ratio. Each figure comes with a plain meaning, such as "athletic range" or "room to build". Your height and weight turn the estimate into lean mass and muscle index.
CHOOSE WHERE YOU'RE HEADED
Pick a goal physique on a map of nine builds, from Lean and Trim to Athletic, Muscular and Powerful, plotted by body fat and muscle. See yourself on the map, the route to your goal, and whether to get leaner, stronger or both.
SEE YOUR GOAL PHYSIQUE
Create an AI preview of you at the build you picked. It illustrates the direction, never a prediction of exactly how you will look.
TRACK EVERY CHECK-IN
Today shows your score toward your goal, what moved since your last check-in, and the next step with what it's worth. Progress charts body fat, muscle index, weight and proportions over 3 months, 6 months or all time. Between check-ins, log your weight, an optional scale body fat % and what you trained; Progress adds a smoothed weight trend and a day-by-day training grid.
COMPARE PROGRESS PHOTOS
Put any two check-ins side by side and get a verdict in plain words, the numbers behind it and an area-by-area read. Prevyu flags photos taken from a different angle or distance so you compare like with like.
RATE YOUR PHYSIQUE FROM THREE ANGLES
A Body Assessment uses front, side and back photos to rank your own regions against each other, screen your posture and give you one training focus for the next eight weeks.
ONE CLEAR NEXT STEP
Coach leads with your next move: when to check in, when to run a Bulk-or-Cut read, when to reassess. Bulk or Cut gives a clear call for where you are right now: cut, bulk, recomp or maintain.
FREE AND PRO
Check in as often as you like. Free includes 15 body fat readings in total, 4 comparisons or Bulk-or-Cut reads each month, your first Body Assessment and one goal preview. Prevyu Pro reads every check-in in full (body fat, muscle index and proportions) and adds the goal map on Today, the full score breakdown, more comparisons, Bulk-or-Cut reads and Body Assessments, and 3 goal previews every month.
APPLE HEALTH
Connect Apple Health to fill your daily log with weight, body fat and workouts, and see your workouts, steps and food between check-ins. Read only: Prevyu never changes your Health data.
PRIVATE BY DESIGN
Your photos stay yours: encrypted, never used for AI training, and deletable at any time, one photo or your whole account. With your permission, photos are analyzed by a third-party AI service (Google Gemini) to produce readings and previews; this permission is required for readings.
Prevyu is a general wellness app, not a medical device. Body fat, muscle index, posture and other readings are estimates from photos and can differ from clinical measurements such as DEXA. Prevyu does not diagnose, treat or prevent any condition. Talk to a qualified professional before making health decisions.
Prevyu Pro is an auto-renewing subscription, monthly or annual. Your local price is shown before you buy. Payment is charged to your Apple Account, and the plan renews unless you cancel at least 24 hours before the end of the current period. Manage or cancel any time in your App Store account settings.
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://downgatelabs.com/privacy-prevyu.html
Screenshots show fictional demo users; their photos are AI-generated.
Connect Apple Health and see what happened between check-ins.
• Connect Apple Health (read only): weight, body fat and workouts fill your daily log, and each check-in shows your workouts, steps and food since the last.
• Coach explains what moved, with protein, training and weekly targets in your own numbers.
• Share "Show your work": your measured change beside your workouts, protein and calories.
• A clearer Today, check-in result and Coach.
The developer, Downgate Labs LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Health & Fitness
- Location
- Contact Info
- User Content
- Identifiers
- Usage Data
- Sensitive Info
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Downgate Labs LLC
- Size
- 98.7 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 15.5 or later.
- iPhone
Requires iOS 15.5 or later. - iPod touch
Requires iOS 15.5 or later.
- iPhone
- Languages
- English
- Age Rating
13+
- 13+
- Infrequent
Medical Treatment information
Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Prevyu Pro Annual $39.99
- Prevyu Pro - Monthly $4.99
- Copyright
- © 2026 Downgate Labs LLC