Last updated: June 22, 2026
Entrain ("the app") is designed to respect your privacy. We built it to work without accounts and to keep your use of it private. This policy explains what is and isn't collected.
Entrain has no account, no login, and no profile. The audio is generated on your device, so your listening sessions, frequency settings, and preset choices stay on your device and are never sent to us. We do not run third-party advertising or analytics SDKs, and we do not sell or share personal data with anyone.
If you choose to subscribe or buy the lifetime unlock, the purchase is handled by Apple (the App Store) and processed through RevenueCat, which we use to manage subscriptions and restore purchases. To do this, RevenueCat receives your purchase/transaction information and an anonymous, app-generated identifier (and a device identifier provided by the platform). This is used only to deliver and restore your purchase and is not linked to your name, email, or any account. We never receive your payment-card details — those are handled entirely by Apple.
The app may use Apple's standard crash reporting if you have opted into sharing diagnostics with developers in your device settings. This contains no personal content and is anonymized by Apple.
Entrain is not directed at children and does not knowingly collect any data from anyone.
If this policy changes, the updated version will be posted on this page with a new date.
Questions? Reach us via ericstevenson.com.
Entrain is intended for relaxation, focus, and meditation support only. It is not a medical device and is not intended to diagnose, treat, cure, or prevent any condition.