Last updated: September 2026
Calm Ball is a bilateral stimulation app for calm, focus and sleep, built to be private by default. There are no analytics and no user accounts. Free users see a small banner ad; the optional one-time Pro purchase removes ads.
We do not collect, transmit, or sell personal data, and the app contains no analytics SDK.
For free users, the app shows a small banner ad served by Google AdMob. To deliver and measure that ad, Google may access a device advertising identifier and related device data as described in Google's Privacy Policy. We request non-personalized ads only, and no account or sign-in is required. After you buy the one-time Pro upgrade, no ad requests are made.
Your settings, saved presets, session history and reminder preferences are stored only in local device storage. They are removed when you clear the app's data or uninstall the app.
The app never records audio and never records you. Bilateral tones are generated on your device; screen reader and haptic support work entirely offline.
If you enable a daily calm reminder, the notification is scheduled locally on your device. Nothing is sent to any server.
You may export your settings, presets and session history to a file on your device (or a service you choose) and import them back later. The export file is written only where you choose to save it; we never see it.
All stimulation features work offline. Normal use makes no network requests; the only network activity is the ad banner shown to free users, purchase validation, and the optional feedback form you explicitly submit.
The optional one-time Pro upgrade is processed by Google Play (or the Apple App Store). Payment details are handled entirely by the store; we never see them. The app stores only a local flag indicating whether Pro is unlocked. Restoring a purchase contacts the store and the purchase-management provider (RevenueCat) using an anonymous device identifier — no name, email, or account is required.
If you choose to send feedback, the message you type (and an optional name) is submitted to our feedback form so we can read it. This is entirely optional and never happens automatically.
The app is suitable for all ages and collects no personal information from anyone, including children.
Questions? Email dombuilds.dev@gmail.com.