Lingo Diary Privacy Policy

Last Updated: January 1, 2026

Welcome to Lingo Diary (the "Service" or the "App"). This Service is provided by SPARKLECT CO., LTD. ("we", "us", or "our"). We take your privacy seriously. This Privacy Policy explains how we collect, use, disclose, and protect your information.

The App is designed to help users learn languages through AI-guided conversations and diary writing in their target language. By downloading or using the App, you agree to the practices described in this Privacy Policy.

1. Information We Collect

To provide AI conversation guidance, diary generation, and personalized language learning services, we may collect the following categories of information:

1.1 Information you provide

  • Account information: When you register, we may collect your email address or third-party login credentials (such as Google or Apple ID) to create your account and sync data.
  • User content: Your conversation messages with the AI, target language selection, native language settings, and language proficiency level.
  • Usage records: Your in-app activity records (such as diary generation history, conversation records) and subscription status.

1.2 Information collected automatically

  • Device information: Including device model, operating system version, unique device identifier, IP address, and language settings.
  • Usage data and analytics events: Through tools such as Firebase Analytics, we record how you interact with the App.

2. How We Use Your Information

We use collected information for the following purposes:

  • Core service delivery: Sending your conversation messages to backend AI models to generate personalized language learning feedback and diary content.
  • Account management and sync: Using Firebase services to store your conversation records, diaries, and settings in the cloud.
  • Analytics and product optimization: Using Firebase Analytics to analyze anonymized usage behavior to improve service quality.
  • Fair Use Policy enforcement: Monitoring daily message counts to implement anti-abuse controls.

3. Information Sharing and Third-Party Services

We do not sell your personal information to third parties. However, to operate the App, we share specific data with the following service providers:

3.1 AI technology providers

  • Recipients: Relevant data may be sent to xAI Grok.
  • Data sent: Limited to your conversation messages and language learning settings.
  • Privacy commitment: We do not send your name, email, phone number, or any personally identifying information to AI providers.

3.2 Cloud storage and infrastructure

  • Google Firebase: We use Firebase for authentication, database storage, and data synchronization.

3.3 Analytics services

  • Google Analytics for Firebase: We use this tool to collect anonymized usage behavior data.

4. Subscriptions and Payments

The App offers subscription services. All transactions are processed through the App Store or Google Play payment systems. We do not collect or store your credit card or bank account information.

5. Data Security and Retention

  • Security: We use industry-standard encryption technologies (such as SSL/TLS) to protect your data.
  • Data retention: We retain your data while your account remains active. If you choose to delete your account, we will permanently delete your personal information from our servers within a reasonable period.

6. Your Rights

  • Access and correction: You may view and edit your data at any time in the settings page.
  • Account deletion: You can find the "Delete Account" option in the account management page of the App.

7. Children's Privacy

The App is not designed for children under 13 years of age. We do not knowingly collect personal information from children.

8. Changes to This Privacy Policy

We may update this Privacy Policy from time to time. Any changes will be posted on this page.

9. Contact Us

  • Company name: SPARKLECT CO., LTD.
  • Email: service@sparklect.com