Privacy Policy

Zen String is built to work fully offline, without an account. This page explains, in plain language, what data the app stores and where.

What's stored on your device

Your level and progress on each board shape, app settings (sound, music, grid, dark mode), and whether you've purchased the ad-removal upgrade are all stored in a small save file on your phone. This data never leaves your device and isn't visible to us: there's no server that stores it, and nobody at Zen String can read it, because we never receive it. Deleting the app deletes this data with it. Zen String currently has no backup or cross-device sync.

Deleting your data

Because everything Zen String stores lives only on your device, and never on a server we control, there's no account to close and no support request needed to delete it. Deleting the app (or clearing its storage in your device's app settings) removes your progress and settings immediately and completely. There's nothing left behind on our end afterward, because nothing was ever sent to us in the first place. The one exception is your purchase record for the ad-removal upgrade, which Google Play retains independently under its own billing and retention policies.

Ads and the ad-removal purchase

Zen String is supported by ads shown between puzzles, never mid-solve, and never during your first several boards. Ads are served by a third-party ad network, which may collect a device or advertising identifier and basic technical information (app version, platform, general region) under its own privacy policy, independent of this one, in order to serve and measure ads. Zen String does not pass it anything you've actually played, no board state, no progress, no settings.

A one-off "Remove Ads" purchase turns ads off completely and permanently, handled entirely through the Google Play Store's own billing. Zen String receives confirmation that the purchase succeeded, stored locally as described above, no payment details ever reach us.

Optionally, a short rewarded ad can also unlock an extra hint or a temporary ad-free period, at your choice, never shown without you asking for it first.

What we don't do

• No accounts or logins. There's nothing to sign up for.
• No analytics SDK. Zen String doesn't track how you play.
• No cloud sync. Everything stays on your device.
• No selling data, and no sharing beyond the ad network and Google Play's own billing. There's no meaningful personal data to sell in the first place.

Children's privacy

Zen String isn't directed at children and isn't designed to collect information from anyone, of any age. Everything it stores stays on-device regardless of who's using it. Ad delivery on the app will be configured for a general audience in line with the ad network's own policies.

Changes to this policy

If Zen String's data practices change, for example if the ad network changes, or cloud sync is added in the future, this page will be updated to reflect it.

Contact

Questions about this policy or how Zen String handles data: info@stillminds.app