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Privacy Policy for LexiCard

Privacy Policy

1. Introduction

LexiCard (the "App") provides language learning support services.
This Policy sets forth how user information is handled.

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2. Information collected

2.1 Account information
- user identifier (UID) provided by Firebase Authentication
- email address (if used)
- display name (if used)

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2.2 Learning data
- vocabulary
- English sentences
- flashcards
- learning history
- notes
- settings information

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2.3 Usage information
- crash logs
- error information
- device information such as OS version

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2.4 Purchase information

To confirm subscription purchase status, the App may obtain the following information:
- purchase information from the Apple App Store
- subscription status (active / expired, etc.)

The App does not collect or store payment information such as users' credit card details.

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3. Purposes of use

Collected information is used for the following purposes:
- providing App features
- storing and syncing learning data
- providing subscription features
- fixing issues
- improving the service
- preventing misuse

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4. External services

The App may use the following external services:

Firebase (Google)

Purpose: authentication / data storage / infrastructure operations
Information sent: UID, learning data, etc.

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Cloudflare

Purpose: API processing / security / communication optimization

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OpenAI

Purpose: AI learning support features
Information sent: text entered by the user

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RevenueCat

Purpose: subscription management
Information sent: purchase status, app user ID

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5. Data retention period

User data is retained as follows:
- learning data: until deleted by the user
- log information: for the period necessary to operate the service

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6. User deletion of data

Users can delete data in the following ways:
- using in-app deletion features
- using the account deletion feature
- requesting deletion by contacting us

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7. Security

The operator takes reasonable security measures to prevent information leaks.

However, due to the nature of internet communications, absolute security cannot be guaranteed.

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8. Minors

Minors should use the App with the consent of a parent or guardian.

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9. Policy changes

This Policy may be revised as necessary.

If there are significant changes, notice will be provided in the App or by a comparable method.

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10. Contact

Operator: Tatsuro Fujie
Contact: contact.lexicard@gmail.com

Last updated: 3/14/2026