PRIVACY POLICY
@CalcMaster - Privacy Policy
Last Updated: January 19, 2026
Effective Date: January 19, 2026
1. INTRODUCTION
David Kelen ("we," "us," "our," or "Developer") is committed to protecting your privacy and ensuring the security of your personal information. This Privacy Policy explains how we collect, use, disclose, and safeguard your information when you use the @CalcMaster mobile application ("App") available on the Apple App Store.
This Privacy Policy applies to all users of @CalcMaster worldwide and complies with applicable data protection laws, including the European Union's General Data Protection Regulation (GDPR), the California Consumer Privacy Act (CCPA), and other relevant privacy legislation.
By using @CalcMaster, you consent to the data practices described in this Privacy Policy. If you do not agree with this Privacy Policy, please do not use the App.
2. DEVELOPER INFORMATION
App Name: @CalcMaster
Developer: David Kelen
Location: France
Contact Email:
support@davidkelen.com
For any questions or concerns regarding this Privacy Policy or our data practices, please contact us at the email address above.
3. INFORMATION WE COLLECT
We collect information that you provide directly to us and information automatically generated through your use of the App.
3.1 Personal Information You Provide
When you create an account and use @CalcMaster, we collect the following personal information:
Email Address: Required for account creation, authentication, and communication purposes
Name: Used for identification and display on leaderboards
Password: Stored in encrypted form for account security through Firebase Authentication
Account Creation Date: Timestamp of when your account was created
3.2 Automatically Collected Information
When you use the App, we automatically collect:
Game Performance Data: Your scores, points, challenge completion times, accuracy rates, and performance statistics
Usage Data: Features accessed, session duration, and interaction patterns within the App
Device Information: Device model, operating system version, unique device identifiers, and mobile network information (collected through Firebase)
Technical Data: App version, crash reports, and diagnostic information for troubleshooting purposes
3.3 Information We Do NOT Collect
We want to be transparent about what we do not collect:
We do not collect precise geolocation data
We do not access your camera, microphone, photos, or contacts
We do not collect payment information (the App is completely free)
We do not track your activity across other apps or websites
We do not use third-party advertising networks or analytics services beyond Firebase
4. HOW WE USE YOUR INFORMATION
We use the information we collect for the following purposes:
4.1 Account Management
Create and manage your user account
Authenticate your identity when you log in
Provide customer support and respond to your inquiries
4.2 App Functionality
Enable you to participate in mathematical challenges
Calculate and display your scores and points
Generate and maintain leaderboard rankings
Track your progress and performance over time
4.3 App Improvement
Analyze usage patterns to improve App functionality
Identify and fix technical issues, bugs, and crashes
Develop new features and enhancements
Optimize user experience and performance
4.4 Communication
Send in-app notifications about changes to our Terms of Service or Privacy Policy
Respond to your support requests and feedback
Communicate important information about the App
4.5 Legal Compliance
Comply with applicable laws and regulations
Enforce our Terms and Conditions
Protect our rights and property
Prevent fraud and abuse
5. LEGAL BASIS FOR PROCESSING (GDPR)
If you are located in the European Economic Area (EEA), United Kingdom, or Switzerland, we process your personal data based on the following legal grounds:
Contractual Necessity: Processing is necessary to provide the App services you requested when you created an account
Legitimate Interests: We have legitimate interests in improving our App, ensuring security, and preventing fraud
Consent: Where required by law, we obtain your explicit consent for specific processing activities
Legal Obligations: We may process your data to comply with legal requirements
6. DATA STORAGE AND SECURITY
6.1 Data Storage Location
Your personal information is stored using Firebase, a cloud-based platform provided by Google LLC. Firebase servers may be located in various countries, including but not limited to the United States and European Union member states.
Data is stored in secure, encrypted databases with industry-standard security measures.
6.2 Security Measures
We implement appropriate technical and organizational security measures to protect your personal information, including:
Encryption: Passwords are encrypted using industry-standard hashing algorithms
Secure Transmission: Data is transmitted using SSL/TLS encryption
Access Controls: Limited access to personal data on a need-to-know basis
Firebase Security: We utilize Firebase Security Rules to restrict unauthorized access
Regular Monitoring: We monitor for suspicious activity and potential security breaches
6.3 Data Retention
We retain your personal information for as long as your account remains active or as necessary to provide you with App services. Specifically:
Active Accounts: Data is retained indefinitely until you request deletion or your account is terminated
Inactive Accounts: We do not automatically delete inactive accounts
Deleted Accounts: Upon deletion request, your data is permanently removed from our active databases within 30 days
Backup Systems: Data in backup systems is deleted during the next backup cycle, typically within 90 days
7. HOW WE SHARE YOUR INFORMATION
We do not sell, rent, or trade your personal information to third parties. We share your information only in the following limited circumstances:
7.1 Public Display
Leaderboards: Your name and scores are publicly displayed on global leaderboards visible to all App users. By creating an account and participating in @CalcMaster, you consent to this public display.
7.2 Service Providers
Firebase/Google: We use Firebase for backend services, including authentication and database storage. Firebase's processing of your data is governed by Google's Privacy Policy and Firebase's data processing terms.
7.3 Legal Requirements
We may disclose your information if required to do so by law or in response to:
Valid legal requests from government authorities
Court orders, subpoenas, or other legal processes
Protection of our legal rights and property
Investigation of fraud, security issues, or violations of our Terms
Protection of the safety of our users or the public
7.4 Business Transfers
In the event of a merger, acquisition, reorganization, bankruptcy, or sale of assets, your information may be transferred to the acquiring entity. We will notify you via in-app notification of any such change in ownership or control of your personal information.
8. YOUR PRIVACY RIGHTS
You have certain rights regarding your personal information, which vary depending on your location.
8.1 Rights for All Users
Access: You may request access to the personal information we hold about you
Correction: You may request correction of inaccurate or incomplete personal information
Deletion: You may request deletion of your account and personal information
8.2 Additional Rights for EEA/UK Users (GDPR)
If you are located in the EEA, UK, or Switzerland, you have additional rights under GDPR:
Right to Restriction: Request restriction of processing of your personal data
Right to Object: Object to processing of your personal data based on legitimate interests
Right to Data Portability: Receive your personal data in a structured, machine-readable format
Right to Withdraw Consent: Withdraw consent at any time where processing is based on consent
Right to Lodge a Complaint: File a complaint with your local data protection authority
8.3 Additional Rights for California Users (CCPA)
If you are a California resident, you have additional rights:
Right to Know: Request disclosure of categories and specific pieces of personal information collected
Right to Delete: Request deletion of personal information
Right to Opt-Out: Opt-out of the sale of personal information (Note: We do not sell personal information)
Non-Discrimination: You will not receive discriminatory treatment for exercising your privacy rights
9. HOW TO EXERCISE YOUR RIGHTS
9.1 Account Deletion and Data Removal
To delete your account and all associated personal data:
Send an email to
support@davidkelen.com
Include "Account Deletion Request" in the subject line
Provide your registered email address and name
We will process your request within 30 days
Important: Account deletion is permanent and irreversible. All your data, including scores and leaderboard entries, will be permanently deleted.
9.2 Access and Correction Requests
To access or correct your personal information:
Send an email to
support@davidkelen.com
with your request
We will respond within 30 days (or as required by applicable law)
We may require verification of your identity before processing requests
9.3 Other Privacy Requests
For any other privacy-related requests or concerns, contact us at
support@davidkelen.com
. We will respond to all requests in accordance with applicable data protection laws.
10. CHILDREN'S PRIVACY
@CalcMaster is recommended for users aged 13 and above due to the complexity of mathematical challenges. However, we do not have a strict minimum age requirement.
10.1 Users Under 13
We do not knowingly collect personal information from children under 13 without parental consent. If you are a parent or guardian and believe your child under 13 has provided us with personal information without your consent, please contact us at
support@davidkelen.com
, and we will delete such information.
10.2 Parental Responsibility
Parents and guardians who allow minors to use @CalcMaster are responsible for monitoring their use and accept this Privacy Policy on the minor's behalf. We encourage parents to be involved in their children's online activities.
11. INTERNATIONAL DATA TRANSFERS
Your personal information may be transferred to and processed in countries other than your country of residence, including the United States, where Firebase servers may be located.
11.1 EEA/UK Users
For users in the EEA, UK, or Switzerland, we ensure that appropriate safeguards are in place for international data transfers, including:
Standard Contractual Clauses: Firebase/Google utilizes EU-approved Standard Contractual Clauses for data transfers
Adequacy Decisions: Where applicable, we rely on adequacy decisions by the European Commission
Additional Safeguards: We implement supplementary measures to ensure data protection
By using @CalcMaster, you consent to the transfer of your information to countries outside your country of residence that may have different data protection standards.
12. COOKIES AND TRACKING TECHNOLOGIES
12.1 Firebase Analytics
@CalcMaster uses Firebase, which may employ cookies and similar tracking technologies to:
Maintain your login session
Store user preferences
Collect analytics data about App usage
Monitor App performance and crashes
12.2 Your Choices
You cannot opt out of essential cookies required for App functionality (such as authentication). However, you can:
Clear your app data through your device settings (which will log you out)
Delete the App to stop all data collection
We do not use cookies or tracking technologies for advertising purposes.
13. THIRD-PARTY SERVICES
13.1 Firebase
@CalcMaster uses Firebase services provided by Google LLC for:
User authentication (Firebase Authentication)
Database storage (Firebase Firestore or Realtime Database)
App performance monitoring
Crash reporting
Your use of Firebase services is subject to Google's Privacy Policy and Firebase's specific data processing terms. We encourage you to review:
Google Privacy Policy:
Firebase Privacy Information:
13.2 No Other Third Parties
We do not integrate with any other third-party services, advertising networks, or analytics platforms beyond Firebase.
14. DATA BREACH NOTIFICATION
In the event of a data breach that compromises your personal information, we will:
Notify affected users via email within 72 hours of discovering the breach (as required by GDPR)
Provide information about the nature of the breach and affected data
Describe steps we are taking to address the breach
Provide recommendations for protecting your information
Notify relevant data protection authorities as required by law
15. AUTOMATED DECISION-MAKING
@CalcMaster does not use automated decision-making or profiling that produces legal effects or similarly significantly affects you.
Our scoring algorithms automatically calculate points based on your performance, but these decisions are limited to game functionality and do not affect your legal rights or status.
16. DO NOT TRACK SIGNALS
@CalcMaster does not respond to "Do Not Track" signals or similar mechanisms because we do not track users across third-party websites or apps. Our data collection is limited to your use of @CalcMaster itself.
17. CHANGES TO THIS PRIVACY POLICY
We may update this Privacy Policy from time to time to reflect changes in our practices, technology, legal requirements, or other factors.
17.1 Notification of Changes
We will notify you of material changes to this Privacy Policy through:
In-app notifications
Email notification to your registered email address (for significant changes)
17.2 Effective Date
The "Last Updated" date at the top of this Privacy Policy indicates when it was last revised. Changes become effective immediately upon notification.
17.3 Your Acceptance
Your continued use of @CalcMaster after notification of changes constitutes your acceptance of the updated Privacy Policy. If you do not agree to the changes, you should stop using the App and request deletion of your account.
18. YOUR CALIFORNIA PRIVACY RIGHTS
California residents have specific rights under the California Consumer Privacy Act (CCPA) and the California "Shine the Light" law.
18.1 Information Sharing for Direct Marketing
We do not share personal information with third parties for their direct marketing purposes.
18.2 CCPA Rights
California residents can exercise the rights described in Section 8.3 of this Privacy Policy by contacting us at
support@davidkelen.com.
19. NEVADA RESIDENTS
Nevada residents have the right to opt out of the sale of their personal information. We do not sell personal information as defined by Nevada law. If you have questions, contact us at
support@davidkelen.com
.
20. CONTACT INFORMATION AND COMPLAINTS
20.1 Contact Us
For questions, concerns, or requests regarding this Privacy Policy or our data practices:
David Kelen
Email:
support@davidkelen.com
We aim to respond to all inquiries within 30 days.
20.2 Data Protection Authority
If you are located in the EEA, UK, or Switzerland and are unsatisfied with our response to your privacy concerns, you have the right to lodge a complaint with your local data protection authority.
For France (where the Developer is located), the supervisory authority is:
Commission Nationale de l'Informatique et des Libertés (CNIL)
Website:
If you do not agree with this Privacy Policy, you must not use the App.
For transparency and CCPA compliance, we collect the following categories of personal information:
Usage Information: Game scores, performance metrics, interaction data
Device Information: Device model, OS version, unique identifiers
We collect this information for: