Effective Date: February 10, 2026 · Last Updated: February 10, 2026
Four Pi Systems LLC ("we," "our," or "us") operates the Stooly mobile application ("Stooly" or the "App"). This Privacy Policy explains how we collect, use, store, and protect your information when you use Stooly.
We built Stooly with privacy as a core principle. We believe you should understand exactly what happens to your data, and we've designed the App to collect only the minimum information necessary to provide you with a great experience.
The key thing to know: Photos you take in Stooly are used solely for real-time analysis and are never stored. Only the resulting health data (classification, scores, and metrics) is saved to your account.
When you create an account using Sign in with Apple, we receive:
We do not receive or store your Apple ID password, and we do not collect your name unless you choose to provide it.
Stooly requests access to your device's camera to capture photos for analysis. Here is exactly what happens to your photos:
We never store, save, view, or share your photos. Period.
After AI analysis, the following health-related data points are generated and stored in your account:
This data is used to provide you with health insights, track trends, and generate personalized wellness tips within the App.
If you subscribe to Stooly, your purchase is processed through Apple's App Store. We do not receive or store your payment information (credit card number, billing address, etc.) — this is handled entirely by Apple.
We use the information we collect for the following purposes:
| Data | Purpose |
|---|---|
| Account info (Apple ID, email) | Account creation, authentication, and support communication |
| Photos (camera) | Real-time AI analysis only; immediately discarded |
| Health data (classifications, scores) | Displaying your history, computing your Gut Health Score, generating trends and personalized insights |
| Subscription status | Determining which features you have access to |
Stooly relies on the following third-party services to operate. Each service processes only the minimum data necessary for its function:
| Service | Purpose | Data Shared |
|---|---|---|
| Third-party AI service | Image analysis and classification | Photo (processed in real-time, not retained by the service) |
| Authentication & database provider | User authentication and data storage | Account info, health data entries |
| Cloud hosting provider | Server infrastructure | Data in transit during API requests |
We do not sell, rent, or share your personal information with any third party for advertising, marketing, or any purpose unrelated to providing the Stooly service.
Your data is stored on secure servers located in the United States. We implement industry-standard security measures to protect your data, including:
While no system can guarantee absolute security, we take reasonable and appropriate measures to protect your information from unauthorized access, alteration, or destruction.
| Data Type | Retention Period |
|---|---|
| Photos | Zero retention. Immediately discarded after real-time analysis. Never written to disk. |
| Health data (entries, scores, trends) | Retained for the lifetime of your active account. |
| Account information | Retained for the lifetime of your active account. |
| After account deletion | All data is permanently deleted within 30 days of your deletion request. |
You have the following rights regarding your data:
Stooly is not intended for use by children under the age of 13. We do not knowingly collect personal information from children under 13. If we become aware that a child under 13 has provided us with personal information, we will take steps to delete that information promptly. If you believe a child under 13 may have provided us with personal information, please contact us at the email below.
Our servers and third-party service providers are located in the United States. If you are accessing Stooly from outside the United States, please be aware that your data will be transferred to, stored, and processed in the United States. By using Stooly, you consent to the transfer of your information to the United States.
We may update this Privacy Policy from time to time. If we make material changes, we will notify you by:
We encourage you to review this Privacy Policy periodically. Your continued use of Stooly after any changes constitutes your acceptance of the updated policy.
If you have any questions, concerns, or requests regarding this Privacy Policy or your personal data, please contact us at:
Four Pi Systems LLC
Email: support@stooly.app
Stooly is designed for general wellness and informational purposes only. It is not intended to diagnose, treat, cure, or prevent any disease. The insights, scores, tips, and information provided by Stooly are educational and should not be considered medical advice. Always consult a qualified healthcare provider for medical concerns or before making changes to your health routine.