Privacy Policy for LinBulk

Last Updated: October 22, 2025

Effective Date: October 22, 2025

LinBulk ("we", "our", or "the app") is committed to protecting your privacy. This Privacy Policy explains how our accessibility-focused messaging assistant handles your information.

1. Information We Access

1.1 AccessibilityService Usage

LinBulk uses Android's AccessibilityService API to assist users with motor impairments or other disabilities in sending messages via Messaging App more easily. Through this service, the app accesses:

• UI Elements: Buttons, text fields, and interface elements within Messaging App
• Message Content: Only the messages that YOU explicitly provide within the app for sending
• Phone Numbers: Only the contact phone numbers that YOU provide or import

1.2 Local Storage

The following data is stored locally on your device using AsyncStorage:

• Contact lists (phone numbers you provide)
• Message templates (messages you create)
• App preferences and settings

2. How We Use AccessibilityService

2.1 Purpose

LinBulk is designed as an accessibility tool to help users who have:

• Motor impairments that make repetitive messaging difficult
• Conditions that benefit from scheduled message assistance
• Need for simplified messaging workflows

2.2 Functionality

The AccessibilityService performs the following actions on your behalf:

• Opens Messaging App chat conversations
• Locates message input fields
• Pastes your pre-written messages
• Clicks the send button
• Returns to the app after completion

3. Data Storage and Processing

3.1 Local Processing Only

LinBulk processes all data exclusively on your device:

• Messages: Temporarily held in device memory during sending, NOT stored permanently
• Contacts: Stored locally in AsyncStorage, NOT uploaded to any server
• Data: Accessed in real-time via AccessibilityService, NOT recorded or saved

3.2 No Server Communication

LinBulk does NOT:

• Send your messages to our servers
• Upload your contact lists anywhere
• Transmit Messaging App conversation data
• Collect analytics or usage statistics
• Track your activity
• Share data with third parties

4. Permissions Explained

4.1 AccessibilityService Permission

Why we need it: To interact with Messaging App's interface on your behalf, helping users with disabilities send messages more easily.

How we use it: Only to automate message sending within Messaging App as described in Section 2.2.

What we access: Messaging App's UI elements only when you choose to send messages.

4.2 Other Permissions

• INTERNET: Required by React Native framework (app does NOT make network requests for data collection)
• SYSTEM_ALERT_WINDOW: To display notifications and overlays
• READ/WRITE_EXTERNAL_STORAGE: To import contact lists from files (optional, controlled by you)
• POST_NOTIFICATIONS: To notify you of message sending status

5. Third-Party Services

5.1 Messaging Apps

LinBulk interacts with Messaging App apps installed on your device (Messaging App and Messaging App X). We do NOT:

• Share data with Messaging App
• Transmit your messages through our servers (messages are sent through Messaging App's normal infrastructure)

Note: Your messages are sent through Messaging App's normal infrastructure, subject to Messaging App's own privacy policy and terms of service.

5.2 No Analytics or Tracking

LinBulk does NOT use:

• Google Analytics
• Facebook SDK
• Advertising networks
• Crash reporting services
• Any third-party data collection tools

6. Data Security

Since all data remains on your device:

• Data security depends on your device's security (lock screen, encryption, etc.)
• We recommend using device encryption and secure lock methods
• No data transmission means no interception risk
• Uninstalling the app removes all local data

7. Children's Privacy

LinBulk is not directed to children under 13. We do not knowingly collect information from children. If you believe a child has used our app, please contact us to request data deletion (though no data is collected by our servers).

8. Your Rights and Controls

You have full control over your data:

• Access: All your data is on your device in the app
• Delete: Clear data in app settings or uninstall the app
• Disable: Turn off AccessibilityService in Android Settings → Accessibility
• Export: Contact data can be exported from the app

9. Changes to Privacy Policy

We may update this Privacy Policy from time to time. We will notify you of any changes by:

• Posting the new Privacy Policy on this page
• Updating the "Last Updated" date
• Providing in-app notification for material changes

You are advised to review this Privacy Policy periodically for any changes.

10. Compliance

10.1 Google Play Policies

LinBulk complies with Google Play's policies regarding:

• AccessibilityService usage for legitimate accessibility purposes
• Transparent data handling practices
• User privacy protection

10.2 GDPR Compliance (For EU Users)

Under GDPR, you have rights to:

• Right to Access: Access your data stored locally on your device
• Right to Erasure: Delete the app and all local data
• Right to Data Portability: Export your contacts from the app

Note: Since no data is collected on servers, there is no data controller processing your personal information externally.

11. Disclaimer

12. Contact Information

If you have questions or concerns about this Privacy Policy or our privacy practices, please contact us:

• Email: cs@krusleung.com
• GitHub: https://github.com/krusleung/LinBulk

13. Consent

By using LinBulk, you consent to this Privacy Policy and agree to its terms. If you do not agree with this policy, please do not use the app.