Privacy Policy

Last Updated: February 13, 2026

Version: 1.0.0

San Kim (Individual Developer) (“Company”, “we”, “us”, or “our”) operates the Lingcall mobile application (the “Service”). This Privacy Policy explains how we collect, use, disclose, and safeguard your information when you use our Service.

Please read this Privacy Policy carefully. By using the Service, you agree to the collection and use of information in accordance with this policy.

1. Information We Collect

1.1 Account Information (Firebase Authentication)

What we collect:

Email address and display name (when you sign in with Google or Apple)
Anonymous user ID (for guest users)

How we collect it: Automatically collected when you sign in with Google, Apple, or use the app as a guest

Why we collect it: User authentication, service delivery, cloud data synchronization

1.2 Voice and Audio Data (Microphone Permission)

What we collect:

Your voice recordings during language practice calls

How we process it:

iOS: On-device speech-to-text conversion using Apple Speech Recognition
Android: On-device speech-to-text conversion using Google Speech Recognition
Voice audio is processed in real-time and converted to text
Audio files are NOT stored on our servers
Only the transcribed text is saved as conversation messages

Why we collect it: Speech recognition for language learning and AI conversation generation

1.3 Conversation Data (Firebase Firestore)

What we collect:

Conversation sessions: messages, timestamps, call duration, AI-generated summaries
For logged-in users: synced to Firebase Firestore
For guest users: stored locally only (no cloud sync)