Privacy Policy

1. Information We Collect

We collect only the following information necessary to provide our services:

• Account Information: When you sign in with Google, we collect your email address and user ID to create and manage your account. This is required to use the transcription features.
• Device Identifier (Android ID): When you first launch the App and start the free trial, we collect your Android ID (a device-scoped random identifier provided by the Android system) together with the app name, and transmit and store them on our developer server. This is used solely for device registration, determining your 3-day free trial eligibility, and preventing abuse. It is not shared with any third party, and we do not collect your IMEI, phone number, or contact list.

We do NOT proactively collect the following data:

• Device model, OS version, or other hardware information (we only read Android API level at runtime for feature compatibility checks, without uploading);
• Crash reports and ANR (Application Not Responding) information: If you install this app via Google Play, the Android system and Google Play may automatically collect crash and ANR information to help developers improve app quality. This data is processed by Google in accordance with its Privacy Policy. The app itself does not actively collect or upload this data.
• Any information used for user profiling or behavioral analysis.

We do NOT collect the following:

• Audio Content: The audio/video files you transcribe and their transcription results are stored locally on your device in a local database. We do not collect, upload, or access this content.
• Business Data: This app does not involve any business documents, images, or other user data uploads or storage.

2. How We Use Your Information

We use the information we collect for the following purposes:

• To provide account authentication through Google Play Services.
• To register your device and determine your 3-day free trial eligibility (based on the Android ID).
• To comply with legal obligations and respond to lawful requests from authorities.

Special Notes:

• The core functionality of this app operates completely offline without transmitting any usage statistics. If you install via Google Play, the Android system automatically sends crash and ANR reports to Google Play Console to help improve app quality. This data is collected and processed by Google; the app itself does not collect crash reports.
• This app currently does not display advertisements and does not use the advertising ID. If this changes in the future, we will update this policy and, where required, obtain your consent before such change takes effect.

3. Information Sharing and Disclosure

We do not sell, rent, or share your personal information with third parties except in the following cases:

• Service Providers necessary for basic functionality:
  • Google Play Services: Used for account sign-in and authentication.
  These service providers follow their own privacy policies, and we only use the minimum necessary permissions.
• ASR Model Downloads: Certain advanced language recognition models need to be downloaded from a network CDN (only on first use). Once downloaded, model files are stored locally on your device. This process does not involve transmission of user data.
• Legal Requirements: To comply with laws, respond to government or judicial requests, or protect our rights, safety, or public interest.

4. Data Storage

Local Storage Location:

• Your transcription results (transcribed text, subtitle files) are stored in a local SQLite database on your device.
• ASR model files and related data files are downloaded and stored in the app's private directory.
• You can view, edit, export, or delete these records at any time from the "History" page.

Data Under Your Control:

• Right to Access: All transcription history and audio associations can be accessed from the "History" page.
• Right to Deletion: Deletion actions on the "History" page take effect immediately, permanently removing data from your device.
• Right to Export: Support for exporting to TXT or SRT files to your chosen device location.

Retention Period:

• Transcription records are stored persistently on your device until you actively delete them or uninstall the app.
• After uninstalling the app, all local data will be cleared by the system.

Security: Since core processing and storage are performed locally on your device, your audio content is never transmitted over the network, fundamentally eliminating the risk of interception during transmission. We recommend enabling device lock screen passwords to further protect your local data.

5. Cross-Border Transfer Statement

The core functionality of this app does not involve cross-border data transfer:

• Audio data and transcription results never leave your device.
• Account authentication is performed through Google Play Services, subject to their privacy policy.
• Device registration data (Android ID) is transmitted to and stored on our developer server, which may be located outside your country or region of residence.
• Some ASR model downloads come from a CDN (Content Delivery Network). The download process only retrieves model files and does not involve transmission of user personal data.

6. Children's Privacy

Our service is not directed to children under 13. If we learn that we have inadvertently collected information from a child under 13, we will delete it immediately. For users aged 13–16, certain rights may require parental consent.

7. Policy Updates

We may update this privacy policy from time to time. When we do:

• We will change the "Effective Date" and version number (e.g., v1, v2, etc.).
• For material changes (such as changes in data processing methods), we will display an in-app pop-up to guide you to review the updated policy.

8. Contact Us

If you have any questions about this privacy policy or wish to exercise your rights, please contact the developer:

• Developer: Shenzhen Dazhong Technology Co., Ltd.
• Email: private@zihiai.com