Plain Language Summary

• We collect personal data and health-related tracking data when you use Stack AI
• We use that data to operate the App, sync your stack across devices, and personalize your experience
• We do not currently sell your personal information, share it for advertising, or use it to train AI models, but we reserve the right to do so in the future with proper notice and consent
• If our company is acquired, your data may transfer to and be used by the acquirer under a new privacy policy
• You can access, correct, export, or delete your data at any time — including a one-tap "Delete Account" inside the App
• This summary is for convenience only. The full Policy below controls.

1. Overview

By creating an account or using the App, you agree to this Privacy Policy. This Policy is incorporated into our Terms of Service.

2. Key Terms

• Health data: Information about your health that you enter into the App (peptides, doses, injection sites, weight, progress photos, notes)
• Sensitive personal information: As defined under applicable state privacy laws, including health data and biometric information
• Consumer health data: As defined under state laws including the Washington My Health My Data Act and Nevada SB 370
• De-identified data: Data processed to remove or obscure personal identifiers
• Aggregated data: Data combined from multiple users into summary statistics

3. Information We Collect

Account Information. Email address (which may be an Apple Private Relay address if you used Sign in with Apple with "Hide My Email"), authentication provider (currently Apple), display name (if provided by Apple at sign-up), and a unique account identifier.

Onboarding Information. Age (for 18+ verification), gender, primary goals, current relationship with peptides, diet and workout context, height and weight, intake methods, peptide-specific goals, and self-reported blockers — all collected only if you complete the corresponding onboarding steps.