Privacy Policy

ToneCoach (the "App")

Last updated: 2026-09-23

This Privacy Policy explains what information we collect, how we use it, and the choices you have. By using the App, you agree to this policy.

1. Information we collect

• Account information — if you create an account: your email address.
• Voice recordings — audio you record while practicing is processed and stored on your device; only the short voice sample you provide to create your personal AI voice is sent to our server for processing.
• Practice data — words you practice, scores, tone curves, practice history and statistics.
• Favorites — words you save.
• Basic device data — such as device type and browser, used only to keep the service running.

2. How we use your information

• To provide the core feature: analyze your pronunciation, show tone feedback, and generate a "correct pronunciation" in your own voice.
• To save your progress and sync it to your account.
• To improve the App and fix problems.

3. Voice data and AI processing

When you use the "Hear it in my voice" feature, only the short voice sample you record for cloning is sent to a third-party AI speech service (SiliconFlow) to create your voice profile and generate feedback audio. Your regular practice recordings are processed on your device and are not uploaded.

Your voice data is used only to generate feedback for you, and is not used to train public models.

4. Third-party services

• Supabase — account, progress storage and sync.
• SiliconFlow — AI voice cloning and speech synthesis.

These providers only process data as needed to deliver the App's features.

5. Data retention and deletion

We keep your data for as long as your account is active, so your progress is preserved. You may request deletion of your account and data at any time by contacting us.

6. Children

The App is intended for language learners. If you are under the age of consent in your region, please use the App with a parent or guardian.

7. Contact

For any privacy questions or requests, contact us at: walterboy2005209@163.com