Mochi Stack

Privacy Policy — Mochi Stack

Last updated: July 13, 2026

Mochi Stack (the “App”, the “Game”) is a kawaii one-finger stack-puzzle game developed by Birkin Apps (“we”, “us”). This Privacy Policy explains what data the App collects, why, and your choices. Mochi Stack does not require an account — play is anonymous.

Summary

Data we collect and why

1. Device identifier / advertising ID

On iOS, your IDFA is used only if you grant permission via Apple’s App Tracking Transparency (ATT) prompt shown by the App. On Android, your Advertising ID (GAID) is used. Purpose: to serve and measure ads through Google AdMob. This is considered tracking.

2. Product interaction / analytics

Events such as run length, perfect stacks, shop visits, and the purchase flow are recorded via Firebase Analytics together with an app-instance ID, device/OS information, and approximate (country-level) location. These are not linked to your identity and are not used for tracking.

3. Crash reports

Firebase Crashlytics collects crash reports and diagnostics (stack traces, device state at the time of a crash) so we can find and fix bugs.

4. Remote configuration

Firebase Remote Config delivers game-balance values and feature flags to your device. It uses standard device information but no personal identifiers.

5. Purchase history

Optional in-app purchases (such as Remove Ads, Coin Doubler, and skin packs) are processed through Apple StoreKit / Google Play Billing, including restoring purchases. We do not process or store your payment-card data — Apple and Google handle payments.

6. On-device settings/progress

Your best scores, coins, unlocked themes and skins, and settings are stored locally on your device using shared_preferences and remain on the device. There is no cloud save.

Data we do NOT collect

We do not collect your name, email address, phone number, precise location, contacts, photos, or health data. There is no social login and no user account.

Third parties (sub-processors)

Advertising/measurement domains used: googleadservices.com, doubleclick.net, googlesyndication.com, google-analytics.com, app-measurement.com.

Your choices & rights

Data deletion

To request deletion of analytics or crash data associated with your device, email support@birkinapps.com. You can delete all local game data by uninstalling the App.

Children

Mochi Stack is intended for a general audience and is not directed to children under 13. If a user is under 13 (or the applicable age in your region), advertising will not be personalized and analytics is restricted, in line with COPPA and GDPR-K.

Store privacy disclosures

Consistent with Apple’s App Privacy and Google Play’s Data Safety, we declare: Device ID (advertising; used for tracking), Product Interaction (analytics), Crash Data (app functionality), Purchase History (app functionality).

Changes

We may update this Policy; the “Last updated” date reflects the latest version.

Contact

Birkin Apps — support@birkinapps.com