# Privacy Policy
Visualization Training ("the app") respects your privacy. This policy explains how the app handles information.
Effective: July 7, 2026
## Information We Collect
This app does not collect personally identifiable information such as your name, email address, or location. It never asks you to enter such information, and no account is required. To improve the app, only anonymous usage data and crash reports are collected (see "Third-Party Services, Ads & Analytics" below).
## Data Stored on Your Device
Your training settings, session history, and self-ratings are stored only on your device. The contents of these records never leave your device. Deleting the app permanently removes all of them.
## Speech Synthesis
All text-to-speech processing happens entirely on your device. No audio or spoken content is transmitted anywhere.
## Additional Content Downloads
Data required for Japanese speech synthesis is downloaded from Apple's servers (On-Demand Resources) on first use. This transfer is handled by Apple and is subject to Apple's privacy policy. The app obtains no information about you through this download.
## Notifications
Reminder notifications are local notifications generated on your device, and only if you enable them. No external server is used for notifications.
## In-App Purchases
Payments for premium features (in-app purchases) are processed by Apple through the App Store. The app never receives your name, address, or payment details such as credit card numbers. Your purchase status (whether Premium is unlocked) is checked on your device to unlock features. To improve the app, events such as paywall views and completed purchases are sent as anonymous usage data (see "Third-Party Services, Ads & Analytics" below).
## Third-Party Services, Ads & Analytics
To improve the app, this app uses Firebase by Google (Google Analytics for Firebase and Firebase Crashlytics). These services collect app usage information (such as launches, screen views, training session activity, paywall views, and completed purchases), crash reports, your device model and OS version, and an anonymous per-app identifier, which are processed on Google's servers. The collected data contains no personally identifiable information and none of your training records. This app shows no ads, does not use the advertising identifier (IDFA), and performs no cross-app or cross-site tracking. For details, see Google's Privacy Policy (https://policies.google.com/privacy) and Firebase's privacy documentation (https://firebase.google.com/support/privacy).
## Changes to This Policy
This policy may be updated as the app evolves. Significant changes will be announced within the app.
## Contact
If you have any questions about this policy, please contact us via the following form:
https://docs.google.com/forms/d/e/1FAIpQLSfRg2Abq8DQVkwStN3EIdiNPO9RWNzu2MeS6btyWPMRTdY5Tg/viewform