ImageDiet+
Last updated: July 19, 2025
Note: This English version is provided for reference only. The legally binding privacy policy is the Japanese version. If you have any questions, please refer to the Japanese version or contact us.
Developer Information
This application "ImageDiet+" is developed and provided by indie developer Tetsuro Nagamatsu.
Information We Collect
ImageDiet+ prioritizes user privacy above all else. We have designed our app based on the following principles:
Information We Do NOT Collect
ImageDiet+ does not collect the following personal information at all:
- Personal Identification Information: Names, email addresses, phone numbers, etc.
- Location Information: GPS coordinates or geographic location data
- Contact Information: Address book or contact data
- Photo Library Access: Camera roll or photo library
- Network Communication: Internet connection or data transmission
- External Usage Tracking: Sending app usage patterns or statistics to external servers
- Crash Reports: External transmission of error information
- Analytics Data: Data transmission to third-party analytics services
Information Stored Locally
To provide app functionality, the following information is stored only on your device:
-
App Settings Data:
- Image conversion quality settings
- Output folder settings
- Post-file processing behavior settings
- Parallel processing count settings
-
Usage Limit Management Data:
- Monthly processed file count (for free version limit management)
- App purchase status
- Hash values for data integrity verification
- Device-specific identifier (system UUID)
-
Temporary Data:
- Temporary folders during ZIP extraction
- Progress status during conversion processing
- Log messages (session only)
All of this information is stored only on your device and is never transmitted to external servers or third parties.
Purpose of Data Use
Locally stored data is used only for the following purposes:
- Providing App Functionality: Maintaining image conversion settings, displaying processing progress
- Usage Limit Management: Proper management of the free version's monthly 250-file limit
- Maintaining App Settings: Remembering user setting preferences
- Preventing Fraudulent Use: Detecting system time manipulation, etc.
Data Sharing
ImageDiet+ never shares collected data with third parties. Data is used only within your device and is never transmitted externally.
App Store Purchase Information
Information regarding in-app purchases (unlimited version purchase) is managed by Apple's system:
- Purchase information is processed on Apple's servers
- Our app only verifies purchase status
- Personal information related to purchases is not stored in our app
- Purchase data is processed according to Apple's Privacy Policy
Security
To protect data on your device, we implement the following measures:
- Data integrity verification (tampering detection)
- Appropriate data encryption (system standard)
- Minimal data storage
- Regular security reviews
App Sandbox Protection
ImageDiet+ uses Apple's App Sandbox technology, with the following restrictions applied:
- Access only to user-selected files and folders
- Network communication is disabled
- No access to system files
- No access to other apps' data
Data Deletion
When you uninstall the app, all stored local data is automatically deleted. If you want to manually delete data, you have the following options:
- Uninstall and reinstall the app
- Delete app data through macOS "Storage Management"
Children's Privacy
ImageDiet+ does not intentionally collect personal information from children under 13. In fact, our app does not collect personal information regardless of age.
Privacy Policy Changes
This privacy policy may be updated as necessary. If there are significant changes, we will notify you within the app or in the App Store description.
Contact
If you have questions or concerns about privacy, please contact us through the following method:
Developer: Tetsuro Nagamatsu
Contact Method: ditto.parasol_8s@icloud.com
Governing Law
This privacy policy is governed by and interpreted under Japanese law.
Summary: ImageDiet+ is a privacy-first app. We don't collect personal information, and all data is stored only on your device. We never communicate with external servers.