Legal
Privacy Policy
Last updated: April 30, 2026
Who we are
Stackr is operated by Stackr Holdings LLC, a New Jersey limited liability company with a registered address at 62 Boyce Place, Ridgewood, NJ 07450, United States. Stackr Holdings LLC is the data controller for personal information processed through the Stackr app and this website.
Summary
Stackr is a personal tracking app for peptides. Your data — peptides, doses, supplies, side effects, body metrics — is yours. We do not sell it, share it with advertisers, or use it to train AI models.
What we collect
- Account data. If you sign in, we store your email and a Stackr user ID so we can sync your data across your devices.
- Tracking data. Anything you log inside the app — peptides, doses, vials, body metrics, notes — is stored on your device and, if you sign in, in your private account in our database.
- Analytics. Anonymous app usage events (e.g. "dose logged", "paywall viewed") via Mixpanel, keyed to a per-user identifier we generate. Never tied to your email or content of your logs.
- Subscription state. Apple tells us whether you have an active Stackr+ subscription. We never see your payment details.
What we don't do
- We don't sell your data.
- We don't share it with advertisers.
- We don't use it to train AI models.
- We don't track you across other apps or websites.
Deleting your data
You can delete your account at any time from Settings → Account. Deletion removes all server-side data within 14 days.
Contact
Questions about this policy or your data? Reach Stackr Holdings LLC at support@stackrpeptides.com.