Prevyu Privacy Policy

Effective date: October 23, 2026
Last updated: October 23, 2026

1. Introduction

Downgate Labs LLC ("Downgate Labs," "we," "us," or "our") operates Prevyu (the "App"), a general wellness app that turns progress photos into a record of your physique over time. Prevyu estimates body composition from photos you take, measures body proportions and posture, tracks those readings across check-ins, and offers optional AI features such as photo comparisons, three-angle Body Assessments and goal previews.

This Privacy Policy explains what information Prevyu collects, how it is used and shared, how long it is kept, and the choices and rights you have. It applies to the Prevyu mobile app and the services behind it.

By creating a Prevyu account and using the App, you agree to the practices described here. If you do not agree, please do not use the App.

Prevyu is for adults. Account setup requires a stated age of 18 or over. See Section 13.

Prevyu is not a medical device. It does not diagnose, treat, cure or prevent any condition, and it provides no medication, dosage or side-effect guidance. Body composition estimates, scores, posture screens, development levels and all AI outputs are approximate. See Section 16.

2. Information We Collect

2.1 Information you provide directly

• Account information. Prevyu accounts are created using a third-party sign-in provider. On Android you sign in with Google; on iOS, Sign in with Apple is also offered. We receive the identifying information that provider returns, typically your name and email address, and we store your email address and a display name. If you use Sign in with Apple's private relay option, the relay address is all we receive. Prevyu does not ask you to create a password, and we never receive your Google or Apple password.
• Photographs. Photos you capture or import for check-ins, Body Assessments, gallery entries, Bulk or Cut analyses and goal previews. Photos may carry embedded metadata such as a capture date; Prevyu reads the capture date so it can date a check-in or assessment correctly.
• Body and profile data. Height, weight, age, sex, and any body-fat percentage you enter yourself, including measured results from a scan, calipers or a clinic. Weight entries you add over time form your weight history.
• Goals and preferences. The physique archetype you are working toward, goal type, target weight, focus areas, any deadline you enter, your training-experience level, unit system and locale.
• Feedback and support correspondence. In-app feedback you submit and any email you send us.
• Purchase information. Your subscription status and entitlements. Purchases are processed by the app store and managed through our subscription provider. We never receive or store your payment card details.

2.2 Information Prevyu derives from your photos and entries

• Estimated body composition. An estimated body-fat percentage produced from a photo, and, when you have entered a weight, a derived lean mass and FFMI.
• Body measurements. Proportion readings such as shoulder-to-waist, chest-to-waist, waist-to-hip and waist-to-height, and posture readings. These are measured on your device. See Section 4.
• Assessments and scores. Your Progress Score and its history, milestones, Body Assessment results, photo comparison results, Bulk or Cut recommendations, and Coach guidance.
• Generated images. Goal previews and shareable progress cards produced from your photos.

2.3 Information collected automatically

• Product analytics. We use Mixpanel to understand how the App is used and whether it is working — for example which features and screens are opened, when check-ins are completed, subscription changes, and errors encountered. Analytics are associated with your account identifier.
• Limited numeric body data in analytics. A small number of analytics events carry coarse body-related values, such as an estimated body-fat figure or sex, which we use to tell whether our estimates are behaving correctly. Your photographs are never sent to analytics, and analytics events do not carry your name or email address.
• Apple Health and Health Connect in analytics. No Health values are sent to analytics: no weights, body fat, steps, calories, protein, or workout times or types. Analytics record only how the feature is used, such as whether Health is connected, which categories are switched on, how many days a sync read and how many entries it filled, how long it took, and whether you allowed Coach to use your Health data. For Coach explanations, they also record the share of a span's days that had food logged, as a percentage.
• Device and diagnostic data. Device type, operating system version, app version, session information, error messages and performance metrics.
• Install attribution. Once per install, Prevyu reads the app store's install attribution information and records any campaign or referral identifier, so we can tell where installs come from. The app stores do not disclose the search terms you typed, and we do not receive them. An organic install carries no campaign identifiers and none are recorded.

2.4 Information from Apple Health and Health Connect (only if you connect it)

If you choose to connect Apple Health (iPhone) or Health Connect (Android), Prevyu reads the types you allow: weight and body fat, workouts and steps, and food (calories and protein). Prevyu never writes to or changes your health data. You choose the types on Prevyu's own screen and again in the system permission screen, and you can change or withdraw them at any time in Profile > Connected apps or in your phone's settings.

On Android, Health Connect's permission screen also lists distance and total calories burned. Health Connect returns these with each workout, so Prevyu must ask for them to read your workouts at all; Prevyu does not use, show, store or send either value.

• On your device. Individual records are read and summarised on your phone and are not uploaded: every food entry, every workout session, every step count, and every weight or body-fat reading other than the one per day that goes into your daily log.
• Saved to your account: your daily log. For each day, Prevyu adds the day's first weight reading from Health to your daily log and, together with it, that day's body fat if Health has one. For a day with a workout, it adds "worked out" and whether it was cardio. No workout times, durations, types or calories go into the log. A value you typed yourself is never overwritten. If you delete a value Health filled in, Prevyu records that day and kind (weight or workout, without the value) so that Health does not fill it in again.
• Saved to your account: span summaries. For the span between two check-ins, Prevyu saves a summary: training days, average workout minutes, the workout type only when every session in the span shared one, regions you tagged yourself, average steps and days with steps, average calories and protein over the days with food logged, how many days had food logged, the weight trend's change and end weight, and the names of the apps that supplied the data (for example "Strong" or "MacroFactor"). Summaries let Prevyu show what went into a change after your phone's own history no longer reaches back. You can delete them in Profile > Connected apps ("Delete saved summaries"), which also deletes the Coach explanations written from them (Section 5.1a); both are deleted with your account. Section 9 explains what stays when you disconnect.
• Sent to our AI provider only with your separate permission. See Section 5.1a.
• Health data is never used for advertising, never sold, never used to train AI models, and never shared with data brokers. It is not stored in iCloud.

2.5 Information we do not collect

• We do not collect precise or approximate geolocation.
• We do not access your contacts, call logs or messages, and we read no other apps' data except the Apple Health or Health Connect types you choose to share (Section 2.4).
• We do not scan or index your photo library. Only the photos you explicitly select or capture are used.
• We do not perform face recognition and do not use any photo or measurement to identify you.
• We do not collect medical records, diagnoses, prescriptions, medication names or dosing information. Prevyu has no medication-tracking feature.
• We do not display advertising and do not work with advertising networks or data brokers.

3. How We Use Your Information

• To provide the App's core functionality: photo check-ins, your progress history, the Progress Score, proportion and posture measurement, comparisons, Body Assessments, Coach guidance, Bulk or Cut analyses and goal previews.
• To produce estimates and derived values, such as lean mass and FFMI from your weight and an estimated body-fat percentage.
• If you connect Apple Health or Health Connect, to fill your daily log and show what you did between check-ins (see Section 2.4), and, only if you separately allow it, to let Coach explain a change (see Section 5.1a). Health data is shown beside your check-ins and is not used to calculate your Progress Score, and scale body fat, typed or from Health, is never used in any score. The one indirect path is a check-in's weight, which feeds the Progress Score through the muscle index: if your daily log has a weight for the photo's day, typed or filled from Health, the check-in screen fills it in, and you can change or skip it before saving.
• To apply health and safety guardrails (see Section 6).
• To operate subscriptions, entitlements and usage allowances, and to prevent abuse.
• To send you the reminders and notifications you have enabled.
• To diagnose faults, measure reliability, understand feature usage and improve the product.
• To respond to your support requests and feedback.
• To comply with legal obligations and enforce our terms.

We do not use your photos or body data to train machine-learning models, and we do not sell or rent personal information.

4. On-Device Processing

Proportion and posture measurements are computed entirely on your device, using on-device machine learning bundled with the App. No network request is made to produce these measurements, and your photo is not uploaded in order to compute them. What is saved to your account is the resulting measurements, so that your history persists.

The App also creates temporary working copies of photos on your device and caches images so screens load quickly. These local files are cleaned up by the App, and are removed entirely when you uninstall it or clear its storage.

5. AI Processing

Several Prevyu features send a photo to an AI provider for analysis. Before Prevyu uploads your first check-in or sends any of the personal data described below to that provider, the App names the data, the provider and the purposes and asks you to select Allow AI processing. Selecting Not now does not grant permission: no photo is uploaded and no disclosed data is sent to the AI provider. Because photo check-ins are the basis of Prevyu's core experience, check-ins and the rest of the App remain unavailable until you grant permission.

After permission is granted, processing happens only for the features listed below and when you take the action that starts them. Requests are routed through our servers rather than made directly from your device.

5.1 Features that send a photo to an AI provider

• Body composition reading. Your check-in photo, plus context such as sex, height, weight, age and any body-fat figure you entered, is sent so an estimated body-fat percentage can be returned.
• Photo comparison. Two of your check-in photos and their context are sent so the change between them can be described.
• Body Assessment. Up to three photos (front, side and back) and your biometric and goal context are sent so per-region results and a training focus can be returned.
• Bulk or Cut analysis. One photo plus your biometrics, priority, training experience and any deadline are sent so a phase can be recommended.
• Gallery evaluation. A gallery photo you choose is sent for an informational body composition evaluation. You confirm before this runs.
• Goal preview. Your photo and context built from your biometrics and chosen archetype are sent so an illustrative image can be generated.

5.1a Coach explanations ("Why it moved") — no photo

If you have connected Apple Health or Health Connect and separately allowed Coach to use those numbers, Prevyu sends a text summary of the span being explained (since the previous check-in, or between two check-ins you compare): the body fat and muscle index read from your photos at each end, your goal, and the averages and counts over that span described in Section 2.4. No photo, name, or individual meal or workout is sent. The explanation that comes back is saved to your account with the summary it was written from, and you can see exactly what was sent under each explanation ("What Coach saw"). You can withdraw this permission at any time in Profile > Connected apps; the rest of the feature keeps working without it. Withdrawing stops anything new being sent; explanations already written stay until you choose "Delete saved summaries" or "Disconnect and delete" there, which delete them together with the summaries, or delete your account. An explanation is also deleted when either check-in it explains is deleted (see Section 9).

5.2 Our AI provider, and what it may do with your data

These features use Google LLC's Gemini API, a third-party AI service, and Prevyu uses it on a paid tier. That distinction matters, because it changes what Google is permitted to do with what we send.

Your photos are not used to train or improve AI models. Under Google's terms for paid Gemini API services, Google does not use prompts or responses — including files such as images — to improve its products. We do not use your photos or body data to train any model of our own, and we do not license or provide them to anyone else for that purpose.

The one carve-out, which we state plainly rather than leave out: Google logs prompts and responses for a limited period solely to detect and prevent violations of its prohibited-use policy, and may retain data for the minimum time needed to comply with law. That is abuse monitoring and legal compliance, not model training.

We do not send Google your name, email address or account credentials, so what reaches the provider is a photograph and the body context needed to interpret it, not your identity. Google's handling is governed by the Gemini API Additional Terms of Service and the Google Privacy Policy.

We use the paid Gemini API under service terms and data-protection commitments that provide the same or equal protection for the personal data described in this Policy. Those protections limit processing to providing and securing the service, require appropriate security, prohibit model improvement unless the customer affirmatively opts in, and limit retention as described above.

5.3 What AI output means

AI outputs are estimates and illustrations. A body-fat estimate from a photograph is not equivalent to a DEXA scan, hydrostatic weighing or any clinical measurement. A goal preview shows a direction, not a prediction of your future appearance. Nothing Prevyu produces is medical advice.

6. Health and Safety Guardrails

Prevyu applies constraints so that goals and generated previews stay within a responsible range. These include a minimum BMI floor and a limit on how much weight loss a preview may depict, sex-specific minimum body-fat percentages and a valid range for a self-reported body-fat figure, warnings when your entries indicate underweight status, a plausibility floor that corrects an implausible body-fat estimate rather than storing it, and the AI provider's built-in safety filters. Photos flagged by those filters are rejected, and repeated rejections may trigger a cooldown.

Data used for these constraints is not used for any other purpose.

7. Third-Party Services

We use the following providers. Each acts as our service provider or processor and is permitted to use the data only to deliver the service described. We require providers that process personal data on our behalf to provide the same or equal protection described in this Policy through their service terms, data-protection commitments and applicable law.

We do not share your information with advertising networks, ad exchanges, data brokers or social platforms.

8. Data Storage and Security

Your photos, generated images, check-ins, measurements, assessments, goals and subscription state are stored in our cloud environment, associated with your account. If you connect Apple Health or Health Connect, the values it fills into your daily log (one weight and body fat per day, and whether you worked out), the record of Health values you deleted, the summaries for each span between check-ins and any Coach explanations you allowed are stored there too. Individual meals, workout sessions and step counts, and any weight or body-fat reading other than the one per day that goes into your daily log, stay on your device (see Section 2.4). Your reminder settings, app preferences, cached images and temporary working files stay on your device.

We maintain technical and organizational measures appropriate to the sensitivity of this data. These include encryption of data in transit, access controls that isolate each account's data so that one user cannot reach another's, time-limited links for retrieving stored images rather than publicly accessible addresses, and restricted internal access to production systems and third-party credentials.

No method of electronic storage or transmission is completely secure, and we cannot guarantee absolute security. You are responsible for the security of your device and your account.

9. Data Retention and Deletion

Your photos, readings, assessments and history are retained for as long as your account exists, because the product's purpose is a longitudinal record.

Deleting individual items. You can delete a photo, a comparison or an assessment from within the App. Deleting a photo also removes the results derived from it.

Deleting your account. Profile settings include account deletion, which permanently removes your stored photos, generated images and all associated records, along with your account itself. If any part of that process does not complete, the App tells you the deletion did not succeed rather than reporting a success, and your account is left intact so you can retry.

Health data. "Disconnect" in Profile > Connected apps stops Prevyu reading Apple Health or Health Connect and also switches off Coach's permission to use your Health data, so nothing new is sent for Coach explanations. Saved summaries and Coach explanations stay in your account after you disconnect; there is no retention period or scheduled cleanup for them. They are deleted when you choose "Delete saved summaries" on that screen, choose "Disconnect and delete" when you disconnect, or delete your account. Two things also happen automatically: an explanation is deleted when either check-in it explains is deleted, and, while Health is connected, a summary is replaced when the check-ins it spans change. While Health stays connected, new summaries are saved again.

Daily log entries filled from Health stay after you disconnect, like entries you typed. You can delete them one at a time in the daily log, and a Health value you delete is not filled in again. Deleting your account deletes all of your Health data, including the record of Health values you deleted.

Data held by others after deletion. Analytics records already collected are retained under our analytics provider's retention policy; you may ask us to request their deletion using the contact details in Section 17. Purchase and subscription records held by the app stores and our subscription provider are retained under their policies and applicable tax and accounting law. Support correspondence is retained for up to 24 months. Content already sent to the AI provider is retained under that provider's terms, as described in Section 5.2, and is not associated with your name or email address.

Images you export. Progress cards, goal previews and other images you choose to save to your device or share with someone else leave Prevyu's control at that point. Deleting your account does not remove copies you have already saved or shared.

10. Data Sharing and Disclosure

We do not sell, rent or trade your personal information, and we do not share it for cross-context behavioral advertising. We disclose information only:

• to the service providers listed in Section 7, for the purposes described there;
• when you direct us to, for example by sharing a progress card;
• to comply with law, a subpoena, a court order or a lawful government request;
• to protect the rights, property or safety of Downgate Labs, our users or the public, or to investigate fraud or abuse; and
• in connection with a merger, acquisition or sale of assets, in which case we will notify users through an in-app notice or an update to this policy before your information becomes subject to a different privacy policy.

11. International Transfers

Downgate Labs LLC is based in the United States, and our service providers process data in the United States and other countries. If you use Prevyu from outside the United States, your information will be transferred to and processed in countries whose data protection laws may differ from those of your own. Where required, we rely on appropriate safeguards such as the European Commission's Standard Contractual Clauses for transfers out of the EEA, the UK and Switzerland.

12. Your Rights and Choices

Everyone

• Access and correct your profile and body data directly in the App.
• Delete individual photos, comparisons and assessments, or your entire account, from the App.
• Turn reminders and notifications off in the App or in your device's system settings.
• Manage or revoke camera and photo-library permissions in your device's system settings.
• Withdraw permission for future sharing with Google Gemini at any time under Profile > Privacy & AI > AI data sharing. Withdrawal immediately blocks new check-ins and the App's other AI-dependent features. Existing photos and results remain in your account unless you separately delete them or delete your account. You may grant permission again from the disclosure screen.
• Opt out of analytics by contacting us at the address in Section 17; there is currently no in-app toggle for analytics. Uninstalling the App also ends analytics collection.
• Manage or cancel your subscription in your app store's subscription settings.

United States state privacy rights

Depending on your state of residence, you may have the right to know what personal information we collect and how it is used, to obtain a copy of it, to correct it, to delete it, to limit the use of sensitive personal information, and not to be discriminated against for exercising these rights. We do not sell personal information and do not share it for cross-context behavioral advertising, so there is no sale or sharing to opt out of. To exercise a right, contact us using Section 17; account deletion is also available directly in the App at any time. You may authorize an agent to act for you, and we may ask you to verify your identity, which for account data means verifying control of your account email.

Consumer health data (Washington, Nevada and similar laws)

Some states treat body measurements, body-fat estimates and related fitness information as consumer health data. Prevyu collects that data only to provide the features you use, as described in Section 2 and Section 3. We do not sell consumer health data, do not use it for advertising, and do not use geofencing of any kind. Where the law requires your consent for collection or for any sharing, we request it before the relevant processing. In particular, the App obtains express permission before uploading a first check-in or sharing photos or body context with Google Gemini, and that permission can be withdrawn in Profile as described above. Data you share from Apple Health or Health Connect is consumer health data too: Prevyu reads it only after you connect it and allow each type, sends it to Google Gemini only with the separate Coach permission in Section 5.1a, and never sells it, uses it for advertising or shares it with data brokers. Residents covered by these laws may request access to, and deletion of, their consumer health data using Section 17.

EEA, UK and Switzerland (GDPR / UK GDPR)

You have the right to access, rectify, erase, restrict and port your personal data, to object to processing, and to lodge a complaint with your supervisory authority.

Our legal bases are:

• Contract — to provide the App you have signed up for, including your account, storage of your check-ins and delivery of the features you use.
• Explicit consent — for processing photographs and body measurements, which are special category data, and for AI processing of those photos and their body context. You give this consent by selecting Allow AI processing before your first check-in (see Section 5), and you may withdraw it at any time under Profile > Privacy & AI > AI data sharing or by deleting your account. Explicit consent is also the basis for data from Apple Health or Health Connect. You give it by connecting Health and allowing the types you choose in the system permission screen, and you may withdraw it at any time in Profile > Connected apps or in your phone's settings. Sending a Health summary to Coach needs a further, separate permission (see Section 5.1a).
• Legitimate interests — for product analytics, diagnostics, security and fraud prevention, balanced against your rights, and limited as described in Section 2.3.
• Legal obligation — where we must retain or disclose information by law.

13. Children's Privacy

Prevyu is intended for adults. Account setup rejects a stated age below 18, and we do not knowingly collect personal information from anyone under 18. Because the App involves photographs and body measurements, we treat this seriously. If we learn that we have collected information from someone under 18, we will delete it promptly. If you believe a minor has provided us with personal information, please contact us.

14. Advertising

Prevyu contains no advertising. We do not share data with advertising networks, ad exchanges or data brokers, and we do not build advertising profiles. Install attribution, described in Section 2.3, tells us which campaign or referral led to an install; it does not target advertising to you inside the App.

15. Device Permissions

• Camera — to take check-in and assessment photos.
• Photo library (read) — to import a photo you select. Prevyu accesses only the photos you pick.
• Photo library (write) — to save progress cards, goal previews and other images to your device when you ask it to.
• Notifications — to deliver check-in reminders and to tell you when a long-running task has finished. Reminders are scheduled on your device; Prevyu does not operate a push notification server.
• Internet and network state — required for sign-in, cloud storage, AI features, analytics and purchase verification.
• Run at startup — so reminders you have scheduled survive a device restart.
• Apple Health / Health Connect (read only) — only if you connect it: weight, body fat, workouts, steps, calories and protein, as described in Section 2.4; on Android also distance and total calories burned, which Health Connect requires to read workouts and Prevyu does not use. On Health Connect this includes reading past data, so a check-in older than 30 days still shows what went into it.

Each permission is used only for the stated purpose, and you can change any of them in your device's system settings.

16. Body Data, Biometric Laws and Health Disclaimers

What body data we hold. Height, weight, age, sex, body-fat percentages you enter or that Prevyu estimates, derived lean mass and FFMI, proportion and posture readings, per-region results, and the photographs those readings came from. This data is used to produce your readings and history, to apply the guardrails in Section 6, and to show you your own record. If you connect Apple Health or Health Connect, we also hold the values it fills into your daily log (one weight and body fat per day, and whether you worked out), the record of Health values you deleted, the summaries for each span between check-ins (including the names of the apps that supplied the data) and any Coach explanations you allowed (see Section 2.4). Health data is not used to calculate your Progress Score, and scale body fat is never used in any score. A check-in's weight does feed the Progress Score, and the check-in screen may fill it in from your daily log, which you can change or skip (see Section 3).

We do not use any of it for identification. Prevyu performs no face recognition and no identity matching. The on-device processing described in Section 4 locates points on the body in order to measure distances and angles; it produces no face template or identity signature, and that data is used only to compute and display your measurements.

Illinois (BIPA) and Texas (CUBI). We do not collect, capture or store biometric identifiers as those laws define them — retina or iris scans, fingerprints, voiceprints, or scans of hand or face geometry — and we do not use any data to identify an individual. Height, weight and body-fat figures you enter are self-reported measurements, and the proportion and posture readings are geometric measurements computed on your device.

Health disclaimer. Prevyu is a general wellness product. It is not a medical device and does not diagnose, treat, cure or prevent any disease or condition. Body composition estimates, Progress Scores, posture screens, development levels, comparisons and every AI output are approximate, are not clinical measurements, and are not a guarantee of any future result. Prevyu does not track medication, manage doses or monitor side effects, and provides no medical advice. Always consult a qualified healthcare professional for medical advice, diagnosis or treatment, and before making significant changes to your diet, training or weight.

17. Contact Us

For any question, concern or privacy request, including access, correction, deletion or an analytics opt-out, contact:

Downgate Labs LLC
Email: downgatelabsllc@gmail.com

We respond to legitimate requests within 30 days, or within the shorter period your local law requires. If you are in the EEA, the UK or Switzerland, you also have the right to complain to your local supervisory authority.

18. Changes to This Policy

We may update this Privacy Policy as the App changes. When we make a material change, we will update the effective date above and, where practicable, tell you through an in-app notice. Your continued use of the App after a change takes effect constitutes acceptance of the updated policy. We encourage you to review this page from time to time.

© 2026 Downgate Labs LLC. All rights reserved.