Privacy Policy

Last Updated: April 3, 2026

Effective Date: April 3, 2026

Revision: 1.0

Revision History

1. Introduction

This Privacy Policy describes how Sia Makerlab ("we," "us," or "our") collects, uses, and shares information in connection with your use of the Unit Converter mobile application (the "App").

By downloading, installing, or using the App, you agree to the collection and use of information in accordance with this Privacy Policy. If you do not agree with this Privacy Policy, please do not use the App.

2. Information We Collect

2.1 Information You Provide

The App is designed to function without requiring you to create an account or provide personal information. We do not collect:

• Names or email addresses
• Phone numbers
• Physical addresses
• Payment information (processed entirely by Google Play)

2.2 Information Collected Automatically

2.2.1 Local Device Storage

The App stores the following data locally on your device only:

• App Settings: Theme preferences (System/Light/Dark), decimal precision, thousand separators, scientific notation preferences, and default category stored via DataStore Preferences
• Favorites: Your favorited conversion categories and units stored via DataStore Preferences
• Conversion History: Recent conversions (up to 50 entries) stored via DataStore Preferences

This data is stored exclusively on your device using Android DataStore. We do not have access to this data, and it is never transmitted to our servers.

2.2.2 Advertising Data (Third-Party)

The App displays advertisements through Google AdMob. Our advertising partner may collect:

• Advertising ID (Android Advertising ID)
• Device information (device type, operating system version)
• IP address
• General location data (country/region level)
• Ad interaction data

The App displays the following types of ads:

• Banner Ads: Adaptive banner displayed at the bottom of the screen
• Interstitial Ads: Full-screen ads displayed at intervals (minimum 15 minutes between displays)

This data collection is governed by Google's Privacy Policy: https://policies.google.com/privacy

2.2.3 In-App Purchase Data (Third-Party)

If you make an in-app purchase to remove advertisements, the transaction is processed entirely by Google Play. We receive only:

• Confirmation of purchase status
• Transaction ID for verification purposes

We do not receive or store any payment card information, billing addresses, or other financial data. All payment processing is handled by Google Play and is subject to Google's Privacy Policy.

2.3 Information We Do NOT Collect

We explicitly do not collect:

• Precise location data (GPS coordinates)
• Contacts, photos, or other personal files
• Microphone or camera data
• Biometric data
• Health or fitness data
• Browsing history
• Communication contents
• Conversion history or unit data (stored locally only)

3. How We Use Information

3.1 Local Data Usage

All locally stored data is used solely to:

• Remember your app preferences and settings
• Maintain favorite categories and units for quick access
• Store recent conversion history for your convenience
• Provide a personalized user experience

3.2 Third-Party Data Usage

Data collected by third-party services (Google AdMob, Google Play) is used to:

• Display personalized or non-personalized advertisements (based on your consent)
• Process in-app purchases
• Prevent fraud and abuse

4. Data Sharing and Disclosure

4.1 We Do Not Sell Your Data

We do not sell, trade, or rent your personal information to third parties.

4.2 Third-Party Service Providers

The App integrates the following third-party services that may collect data according to their own privacy policies:

4.3 Legal Requirements

We may disclose information if required to do so by law or in response to valid requests by public authorities (e.g., a court or government agency).

5. Data Retention

5.1 Local Data

Data stored locally on your device remains until you:

• Clear the App's data through device settings
• Uninstall the App

5.2 Third-Party Data

Data collected by third-party services is retained according to their respective privacy policies. We have no control over the retention periods of third-party services.

6. Your Rights and Choices

6.1 For All Users

You have the right to:

• Access: View your locally stored settings, favorites, and conversion history within the App
• Delete: Remove all local data by clearing app data or uninstalling the App
• Opt-out of Personalized Ads: Manage ad personalization through the App's privacy settings or your device's advertising settings
• Purchase Ad-Free Version: Remove all advertising by purchasing the "Remove Ads" option

6.2 For Users in the European Economic Area (EEA), United Kingdom, and Switzerland

Under the General Data Protection Regulation (GDPR) and applicable laws, you have additional rights:

• Right to Access: Request information about data processing
• Right to Rectification: Request correction of inaccurate data
• Right to Erasure: Request deletion of your data
• Right to Restrict Processing: Request limitation of data processing
• Right to Data Portability: Request transfer of your data
• Right to Object: Object to data processing
• Right to Withdraw Consent: Withdraw previously given consent at any time

To exercise these rights regarding data held by third-party services, please contact those services directly.

6.3 For Users in California (CCPA/CPRA)

California residents have the right to:

• Know what personal information is collected
• Know whether personal information is sold or disclosed
• Opt-out of the sale of personal information
• Access their personal information
• Request deletion of personal information
• Non-discrimination for exercising these rights

We do not sell personal information as defined by the CCPA/CPRA.

6.4 Managing Consent

You can manage your advertising consent preferences at any time through:

• In-App: Settings > Privacy & Data > Manage Privacy Settings
• Device Settings: Android Settings > Google > Ads

7. Data Security

We implement appropriate technical and organizational measures to protect locally stored data, including:

• Data is stored only on your device
• No data transmission to external servers (except through third-party SDKs)
• No cloud synchronization
• No user accounts or authentication data stored

However, no method of electronic storage is 100% secure. We cannot guarantee absolute security of data processed by third-party services.

8. Children's Privacy

The App is not directed to children under the age of 13 (or 16 in the EEA). We do not knowingly collect personal information from children.

If you are a parent or guardian and believe your child has provided personal information through third-party services integrated in the App, please contact the respective third-party service providers.

9. International Data Transfers

If you use the App outside of your country of residence, please be aware that data collected by third-party services may be transferred to and processed in countries with different data protection laws than your own.

For users in the EEA, UK, or Switzerland, Google has implemented appropriate safeguards for international data transfers. Please refer to Google's Privacy Policy for more information.

10. Third-Party Links and Services

The App may contain links to third-party websites or services. We are not responsible for the privacy practices of these third parties. We encourage you to review the privacy policies of any third-party services you access.

11. Changes to This Privacy Policy

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

• Updating the "Last Updated" date at the top of this Privacy Policy
• Displaying a notice within the App for material changes

Your continued use of the App after any changes constitutes acceptance of the updated Privacy Policy.

12. Disclaimer of Liability

12.1 Third-Party Services

We are not responsible for the data collection, use, or security practices of third-party services integrated into the App, including but not limited to Google AdMob, Google Play Billing, and Google UMP. Your use of these services is subject to their respective terms and privacy policies.

12.2 Conversion Accuracy

The App provides unit conversions based on standard conversion factors. We do not collect or store any conversion data on our servers. You are solely responsible for verifying the accuracy of conversions and for any decisions made based on the App's results.

12.3 Data Loss

We are not responsible for any loss of data stored locally on your device, including but not limited to data loss caused by:

• Device malfunction or damage
• App uninstallation
• Operating system updates
• User error

12.4 Limitation of Liability

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, WE SHALL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES, OR ANY LOSS OF PROFITS OR REVENUES, WHETHER INCURRED DIRECTLY OR INDIRECTLY, OR ANY LOSS OF DATA, USE, GOODWILL, OR OTHER INTANGIBLE LOSSES RESULTING FROM YOUR USE OF THE APP.

13. Governing Law

This Privacy Policy shall be governed by and construed in accordance with the laws of the Republic of Korea, without regard to its conflict of law provisions.

For users in the European Union, this Privacy Policy shall be interpreted in accordance with applicable EU law, including the GDPR.

14. Contact Us

If you have any questions, concerns, or requests regarding this Privacy Policy or our data practices, please contact us at:

Sia Makerlab

• Email: sia@siamakerlab.com
• Company Website: https://siamakerlab.com

For GDPR-related inquiries from EEA residents, please include "GDPR Request" in the subject line.

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Summary of Data Practices

*Collected by third-party services (Google), not by us directly.

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This Privacy Policy is available in English. If translated versions are provided, the English version shall prevail in case of any discrepancy.