Rumusin Privacy Policy

Last updated: June 2, 2026

This Privacy Policy explains how the Rumusin app ("Rumusin", the "app", "we") manages information when users use the app. Rumusin was developed by Naufal Prakoso to help Indonesian students study materials, use calculators, and practice quizzes.

By using Rumusin, users agree to the practices described in this Privacy Policy.

Information We Manage

1. Learning profile information

During onboarding, users may enter information such as:

• Name
• Age
• School
• Class
• Education level
• Selected subjects

This information is used to personalize the learning experience inside the app.

2. Learning progress data

Rumusin may store progress data such as:

• History of opened materials
• Favorite materials
• Last page read
• Daily learning target
• Daily study duration
• Best quiz score
• Number of quiz attempts
• Topics that need more practice

This data is used to show recommendations, history, and a more personalized learning experience.

3. App usage data

Rumusin uses Firebase Analytics to understand general app usage, for example:

• App opened
• Selected tabs or pages
• Opened materials
• Calculators used
• Quizzes started or completed
• Selected education level and subject filters

Analytics data is used to improve features, content, and user experience.

4. Crash and performance data

Rumusin uses Firebase Crashlytics to help detect and fix app errors. Information that may be processed includes:

• Crash information
• Device type
• Operating system version
• App version
• Technical logs related to errors

This data is used to maintain app stability.

5. Advertising data

Rumusin uses Google AdMob to display ads. AdMob may process information such as:

• Device identifiers or advertising identifiers
• Ad interaction information
• Technical device information
• Approximate location based on network or IP address

Advertising data is processed by Google according to Google's ad policies and settings.

Data Storage on Device

Some profile and learning progress data is stored locally on the user's device. On Android, app preference data is stored using local app storage and some app state is encrypted using Android security features when available.

Uninstalling the app may remove locally stored data from the device.

Use of Firebase and Third-Party Services

Rumusin uses the following third-party services:

• Firebase Core
• Cloud Firestore
• Firebase Analytics
• Firebase Crashlytics
• Google AdMob

These third-party services may collect or process data according to each provider's privacy policy.

References:

• Google Privacy Policy
• Google Advertising
• Firebase Privacy and Security

How We Use Information

Information managed by Rumusin is used to:

• Run the app's core features
• Store learning progress and preferences
• Show learning recommendations
• Measure feature usage in aggregate
• Fix bugs and crashes
• Show ads
• Improve content quality and app experience

We do not sell users' personal data.

Sharing Information

We may share or process information through service providers that help operate the app, such as Google Firebase and Google AdMob.

We may also disclose information when required by law, regulation, legal process, or a request from an authorized authority.

Children and Students

Rumusin is intended to help students in Indonesia, including middle and high school students. If users are minors, app usage should be done with the knowledge of a parent or guardian.

Rumusin is not intended to collect excessive data from children. The requested learning profile information is only used to personalize the learning experience in the app.

Data Security

We make reasonable efforts to protect data, including the use of local app storage and encryption for some state data on Android devices when available. However, no data storage or transmission method is completely secure.

User Choices

Users can:

• Change learning preferences in the app when the feature is available
• Delete local data by uninstalling the app from the device
• Manage ad preferences through Google or device settings
• Contact us with privacy-related questions

Data Retention

Local data is stored while the app is installed on the device or until the user deletes app data. Data processed by third-party services follows each service provider's retention period and policies.

Changes to This Privacy Policy

This Privacy Policy may be updated from time to time. Changes will be displayed on this page with the latest update date.

Contact

If you have questions about this Privacy Policy, contact:

Naufal Prakoso
Email: privacy@naufalprakoso.com
Website: https://naufalprakoso.com