Prevyu: AI Body Fat Scanner

Prevyu is an AI body fat scanner and physique tracker. Snap one photo and see where you are: an estimate of your body fat percentage, muscle index (FFMI) and shoulder-to-waist ratio. Then see where you could be: an AI preview of you at the build you choose. Check in each week and see whether you're getting closer, and why.

Looking for a body fat calculator that works from a photo, an honest "rate my physique" app, or a progress photo tracker that tells you what actually changed? Prevyu does all three, and keeps every reading in one timeline.

BODY FAT PERCENTAGE FROM ONE PHOTO

Take a progress photo in good light. Prevyu draws the shoulder and waist guides on it and gives you three readings: an estimated body fat percentage, your muscle index (FFMI) and your shoulder-to-waist ratio. Your height and weight turn the estimate into lean mass and muscle index.

SEE YOURSELF AT YOUR GOAL PHYSIQUE

Create an AI goal preview from your own photo and the build you picked, sized to the gap between you and that build, so it looks like a realistic you, not a bodybuilder. It shows the direction, never a prediction of exactly how you will look.

TRACK BODY FAT AND MUSCLE OVER TIME

Today shows your score toward your goal, what moved since your last check-in, and your next step. Progress charts body fat, muscle index (FFMI), weight and body measurements over time, so a cut, bulk or body recomp is easy to judge.

RATE MY PHYSIQUE, EVERY MUSCLE

Hit a pose and get a flex read: each muscle group rated on a five-step scale from Untrained to Elite, with your strongest group up front. See each pose level up over time and turn it into a flex card to share.

KNOW WHY IT MOVED

Coach explains each change in plain words, looking across your last few check-ins. Bulk or Cut gives a clear call for where you are right now: cut, bulk, recomp or maintain.

COMPARE PROGRESS PHOTOS

Put any two progress photos side by side and get a verdict in plain words, the body composition numbers and an area-by-area read. Prevyu flags photos taken from a different angle or distance.

CHOOSE YOUR GOAL PHYSIQUE

Pick a build on a map of nine physiques, from Lean and Trim to Athletic, Muscular and Powerful, laid out by body fat and muscle, and see the route from where you stand.

BODY ASSESSMENT FROM THREE ANGLES

A Body Assessment uses front, side and back photos to rank your regions against each other, screen your posture and give you one training focus for the next eight weeks.

FREE AND PRO

Free shows every number Prevyu measures and includes 15 photo readings (check-ins, private reads and your first flex read each use one), 4 comparisons or Bulk-or-Cut reads each month, your first Body Assessment, one goal preview and one Coach explanation. Prevyu Pro reads every check-in in full and adds Coach on every check-in, the goal map and targets, more comparisons, Bulk-or-Cut reads and Body Assessments, flex reads and flex cards, clean progress cards and 3 goal previews each month. Your local price is shown before you subscribe; manage or cancel any time in Google Play.

HEALTH CONNECT

Connect Health Connect (read only) to fill your daily log with weight, body fat and workouts, and see your workouts, steps and food between check-ins.

PRIVATE BY DESIGN

Your photos stay yours: encrypted, never used for AI training, and deletable at any time. 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. Like any photo-based body fat scanner, its body fat, muscle index, posture and other readings are estimates and can differ from clinical body composition measurements such as DEXA or a body fat scale. Prevyu does not diagnose, treat or prevent any condition.

Privacy Policy: https://downgatelabs.com/privacy-prevyu.html

Screenshots show fictional demo users; their photos are AI-generated.

Recent changes:
Rate every muscle from one flexed photo.
• Flex: hit a pose and get every muscle group rated, Untrained to Elite, then share it as a flex card.
• Coach explains why your numbers moved.
• Progress reorganized into Trends, Photos, Log and Analysis.
• A built-in camera with a self-timer.
• Simpler setup, separate height and weight units.
• Bug fixes and improvements.