Privacy Policy
Last updated: December 2024
Your privacy is important to us. This policy explains how Zen Kana collects, uses, and protects your information.
1. Information We Collect
Learning Data
- • Practice session results and progress tracking
- • Selected characters, word groups, and difficulty presets
- • Response times, accuracy rates, and performance statistics
- • Spaced repetition algorithm data (ease factors, review intervals)
- • Custom preset configurations and accessibility settings
Account Information
- • Email address (when using Google/Apple Sign-In)
- • Display name and profile picture (from authentication provider)
- • Account preferences and consent settings
- • Cross-device synchronization timestamps
Technical Data (Optional)
Only collected with your explicit consent:
- • App usage analytics and feature interaction data
- • Crash reports and error logs for stability improvements
- • Device type, operating system, and app version
- • Session duration and frequency of use
2. How We Use Your Information
Core Learning Functions
- • Implementing spaced repetition algorithm for optimal learning
- • Synchronizing progress and preferences across your devices
- • Providing personalized statistics and learning insights
- • Maintaining session persistence and recovery functionality
App Improvement (With Consent)
- • Understanding feature usage to guide development priorities
- • Identifying and fixing technical issues and crashes
- • Analyzing learning patterns to improve algorithm effectiveness
- • Optimizing app performance and user experience
3. GDPR Compliance & Your Rights
Granular Consent Control
Zen Kana implements comprehensive consent management that allows you to independently control different types of data collection:
- • Essential Functions: Always enabled (learning progress, sync)
- • Analytics: Optional feature usage tracking
- • Crash Reporting: Optional error and stability data
You can modify these consent settings at any time through the app’s Privacy Settings.
Your Rights Include:
- • Access your personal data
- • Rectify inaccurate information
- • Request data deletion
- • Data portability
- • Withdraw consent anytime
Data Minimization:
- • Collect only necessary data
- • Transparent consent process
- • Regular data cleanup
- • Privacy-first defaults
- • Local-first architecture
4. Data Storage & Security
Secure Infrastructure
- • Data encrypted in transit and at rest using industry-standard protocols
- • Firebase infrastructure with Google Cloud Platform security standards
- • Regular security audits and compliance monitoring
- • Automatic backup systems with redundancy protection
Local Storage:
Core app functionality works entirely offline:
- • Progress data cached locally
- • No internet required for practice
- • SharedPreferences + WebDataManager
- • Session persistence across app restarts
Cloud Sync (Optional):
Enhanced features for signed-in users:
- • Firebase Firestore database
- • Cross-device synchronization
- • Intelligent conflict resolution
- • Timestamp-based data merging
5. Third-Party Services
Authentication Providers
- • Google Sign-In: Email, profile name, and picture
- • Apple Sign-In: Email verification and privacy relay
- • Data shared only for account creation and authentication
- • No additional data sharing with these providers
Analytics (Consent-Based)
- • Firebase Analytics: App usage patterns (with consent)
- • Firebase Crashlytics: Error reporting (with consent)
- • All services can be individually disabled in Privacy Settings
6. Children’s Privacy
Zen Kana is suitable for learners of all ages, including children. We take additional precautions for users under 16:
- • No behavioral advertising or tracking
- • Minimal data collection focused on educational functionality
- • Parental consent mechanisms where required by law
- • Enhanced privacy protections and simplified consent flows
- • Regular review of age-appropriate data practices
7. Data Retention & Deletion
Automatic Cleanup
- • Expired practice sessions automatically removed after 24 hours
- • Temporary data (voice recordings) processed locally and immediately discarded
- • Cache cleanup during app updates and maintenance
Account Deletion
- • Complete account and data deletion available in Privacy Settings
- • All cloud data permanently removed within 30 days of request
- • Local data can be cleared by uninstalling the app
- • Confirmation process to prevent accidental deletion
8. Changes to This Policy
We may update this Privacy Policy to reflect changes in our practices or applicable laws. When we make significant changes:
- • Users will be notified through in-app notifications
- • Updated policy will be posted on this website
- • Previous versions will be archived for reference
- • Continued use constitutes acceptance of updated terms
9. Contact Information
For privacy-related questions, data requests, or to exercise your rights under GDPR:
Email: jacob@suchorab.ski
Response Time: We respond to all privacy requests within 72 hours
Include your account email (if applicable) and specific details about your request for faster processing.