Privacy Policy

 Effective date: 1 September 2026

Last updated: 1 September 2026

  

  This Privacy Policy explains how the "Winter Arc Challenge" mobile application

  ("the App", "we", "us") collects, uses, and shares information when you use it.            

  By using the App you agree to this policy.

  # 1. Who we are

  Winter Arc Challenge is an independent, personal project.

  Contact: **sr92249@gmail.com**

  # 2. Information we collect

  ## a. Information you provide

  - **Google account details** when you sign in with Google: your name, email

    address, profile photo, and Google account identifier.

  - **Profile information** you enter: display name, username, and optional bio.

  - **Habit and activity data** you create in the App: your habits, daily

    check-ins / completions, streaks, challenges you create or join, and friend

    connections (friend requests, accepted friends).

  ### b. Information collected automatically

  - **Device and usage data** via Google Analytics for Firebase: app opens,

    screens viewed, in-app events (e.g. sign-in, habit completed, challenge

    created), app version, device model, operating system version, language,

    and general region.

  - **Push notification token** (Firebase Cloud Messaging) so we can send you

    reminders and friend-request notifications.

  - **Advertising identifier** and related data used by Google AdMob to serve

    and measure ads (see Section 5).

  - **Approximate diagnostics / crash data** to keep the App stable.

  We do **not** collect precise location, contacts, photos, or payment

  information. The App contains no real-money features.

  ## 3. How we use information

  - Create and secure your account and authenticate you.

  - Provide core features: habit tracking, streaks, challenges, and the friends

    feature (showing your progress to friends you have added, and theirs to you).

  - Send push notifications you have enabled.

  - Understand how the App is used and improve it (analytics).

  - Display advertising to support the App (see Section 5).

  - Detect, prevent, and address abuse, fraud, or technical problems.

  ## 4. How information is shared

  We use the following third-party services, which process data on our behalf or

  as independent controllers under their own privacy policies:

  | Provider | Purpose | Policy |

  |---|---|---|

  | Google Firebase (Authentication, Cloud Firestore, Cloud Messaging, Cloud Functions, Analytics)

  | Account, data storage, notifications, analytics | https://firebase.google.com/support/privacy

  |

  | Google AdMob | Advertising | https://policies.google.com/technologies/ads |

  | Google Sign-In | Authentication | https://policies.google.com/privacy |

  Your habit progress, streaks, and profile (name, username, photo) are visible

  to users you have accepted as friends within the App. We do not sell your

  personal information. We may disclose information if required by law or to

  protect our rights and users' safety.

  ## 5. Advertising

  The App shows banner and interstitial ads through Google AdMob. AdMob and its

  partners may use an advertising identifier and limited data to serve

  personalised or non-personalised ads and to measure their performance.

  If you are in the European Economic Area, the United Kingdom, or Switzerland,

  we present a Google-certified consent request (Google User Messaging Platform)

  on first launch, and your choice is respected. You can change your choice later

  from the App or your device settings.

  You can reset or limit ad tracking via your device: **Android** → Settings →

  Google → Ads.

  ## 6. Data retention

  We keep your account data for as long as your account exists. Analytics data is

  retained according to Google's default retention settings. You can request

  deletion of your account and associated data at any time (see Section 7).

  ## 7. Your choices and rights

  - **Access / correction:** you can view and edit your profile and habit data in

    the App.

  - **Account and data deletion:** email **sr92249@gmail.com** from your

    registered address with the subject "Delete my account". We will delete your

    profile, habit data, challenges, and friend connections within 30 days,

    except where retention is required by law.

  - **Notifications:** disable them in your device settings at any time.

  - **Analytics:** you may opt out of Google Analytics for Firebase collection

    through the App where available, or by uninstalling the App.

  Depending on where you live (e.g. EEA/UK under GDPR, California under CCPA/CPRA),

  you may have additional rights including data portability and the right to

  object to or restrict processing. Contact us to exercise these rights.

  ## 8. Children

  The App is not directed to children under 13 (or the minimum age of digital

  consent in your country). We do not knowingly collect personal information from

  children. If you believe a child has provided us data, contact us and we will

  delete it.

  ## 9. Data security and location

  Data is stored on Google Cloud / Firebase servers and may be processed in the

  United States and other countries where Google operates. We rely on Google's

  security measures and use industry-standard safeguards, but no method of

  transmission or storage is completely secure.

  ## 10. Changes to this policy

  We may update this policy from time to time. Material changes will be reflected

  by a new "Last updated" date, and where appropriate, notified in the App.

  ## 11. Contact

  Questions or requests: **sr92249@gmail.com**