How accurate is body-fat estimation from a photo?
It is an estimate, not a clinical measurement. Pose, lighting, clothing, hydration, and other factors can affect a reading. Prevyu is most useful for following a consistent longer-term trend; do not compare its numbers directly with DEXA or assume they are medically equivalent.
What does the Progress Score mean?
It is a smoothed, banded summary of your check-in trend, designed to make direction easier to see while reducing the importance of small changes that may only be measurement noise.
How is Prevyu different from a body-fat smart scale?
A smart scale infers composition from bioimpedance; Prevyu reads a photograph. Neither is a lab measurement, and Prevyu does not claim to be more accurate. Prevyu adds the source photo, a smoothed trend, geometric proportions, and a visual history. You can also enter a measured body-fat figure from another source on any plan.
Which measurements run on my phone?
Photo-based proportions and posture analysis run on device. Requested AI composition readings, comparisons, assessments, Coach, Bulk or Cut, gallery analysis, and goal previews use server-side AI processing.
What is included for free?
Free users get unlimited photo check-ins and history, the Progress Score, on-device proportions, manual body-fat entries, 15 AI body fat readings in total, and 4 comparisons or Bulk-or-Cut reads each month. Your first three-angle Body Assessment, one goal preview and Coach's first “Why it moved” explanation are also included, and so is connecting Apple Health or Health Connect.
Do free users get AI check-in comparisons?
Yes. Free includes 4 comparisons or Bulk-or-Cut reads each month. Prevyu Pro includes more.
Are my photos used to train AI models?
No. Requested AI features use Google's paid-tier Gemini service through Prevyu's server, and photos are not used to train AI models. See the privacy policy for full provider and safety-logging details.
Does Prevyu work with Apple Health or Health Connect?
Yes, read only and only if you connect it. Prevyu fills your daily log with weight, scale body fat and workouts, and shows the workouts, steps, calories and protein between check-ins. It never writes to your Health data, and Health data is not used to calculate your Progress Score. See section 2.4 of the privacy policy.
Can Prevyu diagnose a condition or advise me about medication?
No. Prevyu is an adults-only general wellness app, not a medical device. It does not diagnose conditions, give medication advice, or replace a clinician.
Can I use Prevyu without an account?
No. Prevyu requires an account so check-ins and paid access stay with the right person. On iPhone you can use Sign in with Apple or Google; on Android you sign in with Google.
Do I have to use the AI features?
To check in, yes. Before your first check-in, Prevyu asks your permission to send your photos and body context to its AI provider, Google Gemini, through Prevyu's server. If you choose Not now, nothing is uploaded, but check-ins stay unavailable until you allow it. You can withdraw permission at any time in Profile > Privacy & AI > AI data sharing. That blocks new check-ins and the other AI features, and your existing photos and results stay in your account unless you delete them. Proportions and posture are always measured on your phone.
What happens if I replace or lose my phone?
Install Prevyu on your new device and sign in with the same Apple or Google account to restore your stored check-ins and history. Pro restores through your app store. Weekly reminder settings are device-local and must be set again.
Is Prevyu available on iPhone?
Yes. Prevyu is available for iPhone through the App Store, in addition to Android 8.0 or later through Google Play.
How do I delete my account?
Use the account-deletion control in the app. This starts deletion of the account and associated cloud data, subject to limited records retained for security, legal, or transaction purposes.
