# Privacy Policy — BrainDuel

**Last updated: April 8, 2026**

**Developer: Techno Coders**

**App: BrainDuel (com.coderstechno.brainduel)**

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## 1. Overview

BrainDuel is a fully offline brain game. We built it to work without any internet connection, without accounts, and without collecting any personal information. This policy explains exactly what data the app stores, where it stays, and what we do with it.

**Short version:** We do not collect, transmit, or share any data about you. Everything the app stores lives on your device and never leaves it.

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## 2. Data We Do NOT Collect

We do not collect:

- Your name, email address, phone number, or any contact information

- Location data (coarse or precise)

- Device identifiers (IMEI, Advertising ID, Android ID)

- Usage analytics or crash reports sent to any server

- IP addresses or network information

- Payment information

- Photos, camera, or microphone data

- Contacts or calendar data

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## 3. Data Stored Locally on Your Device

The app stores a small amount of data **locally on your device only**. This data never leaves your device and is never transmitted anywhere.

| Data | Where stored | Purpose |

|------|-------------|---------|

| Player name (you set this) | Android DataStore (private app storage) | Display your name in-game |

| Avatar color preference | Android DataStore (private app storage) | Personalization |

| Sound / vibration preferences | Android DataStore (private app storage) | App settings |

| Notification preference | Android DataStore (private app storage) | Daily challenge reminder toggle |

| Trophy count and rank | Room database (private app storage) | Ranking system |

| Game statistics (win rates, streaks, reaction times) | Room database (private app storage) | Stats screen |

| Daily challenge completion record | Room database (private app storage) | Prevent replaying the same daily |

| Last duel round results | Temporary cache file in cacheDir | Pass results between screens; deleted immediately after reading |

All of the above is stored in Android's private app storage. It is not accessible to other apps and is deleted when you uninstall BrainDuel.

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## 4. Permissions

BrainDuel requests the following Android permissions:

| Permission | Why |

|-----------|-----|

| `INTERNET` | Required by Google Play Services for app integrity checks during install/update. The app itself does not make any network requests. |

| `RECEIVE_BOOT_COMPLETED` | Reschedule the optional daily challenge notification after device reboot. |

| `POST_NOTIFICATIONS` | Send the daily challenge reminder notification (Android 13+). You can disable this in Settings > Notifications or inside the app. |

| `VIBRATE` | Optional haptic feedback during gameplay. |

We do not request access to your camera, microphone, location, contacts, storage, or any other sensitive permission.

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## 5. Notifications

If you enable the "Daily Challenge Reminder" in Settings, BrainDuel will send a local notification at 9 AM each day. This notification is generated entirely on your device — no server is involved. You can disable it at any time in the app's Settings screen or in Android's system notification settings.

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## 6. Third-Party SDKs

BrainDuel version 1.0 does not include any third-party analytics, advertising, or data collection SDKs. It does not integrate with:

- Google Analytics / Firebase Analytics

- Facebook SDK

- AdMob or any ad network

- Crashlytics or any crash reporting service

- Any social login provider

If advertising or analytics are added in a future version, this policy will be updated before release.

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## 7. Children's Privacy

BrainDuel does not collect any personal information from any user, including children under 13. The app contains no chat, no user-generated content sharing, no social features, and no account creation. It is safe for all ages.

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## 8. Data Security

Because no personal data is transmitted to any server, there is no server-side data to secure. All locally stored data (DataStore and Room) is stored in Android's private app storage, which is sandboxed from other apps by the Android operating system.

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## 9. Data Retention and Deletion

All locally stored data is retained until you uninstall the app, at which point Android deletes it automatically. You can also reset your progress at any time by clearing the app's data in Android Settings > Apps > BrainDuel > Storage > Clear Data.

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## 10. Changes to This Policy

If we make material changes to this privacy policy, we will update the "Last updated" date at the top of this page and note the change in the app's Play Store release notes. Continued use of the app after a policy update constitutes acceptance of the revised policy.

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## 11. Contact

If you have any questions about this privacy policy, contact us at:

**Techno Coders**

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*This policy applies to BrainDuel version 1.0 and later, published on Google Play by Techno Coders.*