Privacy Policy

The Service is a Chrome browser extension that tracks and visualizes price change history of products on Coupang (coupang.com). The Service does not collect personal information. We only process product-related data necessary for service operation and do not process any information that can personally identify users.

1. Information Transmitted to Server (piryo.mupersei.com)

To provide price history tracking functionality, the Service transmits only the following product-related information to external servers. This information is publicly available product information on the Coupang website and does not constitute personal information.

API endpoints that transmit data to server:

2. Information Stored Only on User Device (Local Storage)

The following information is stored only in Chrome browser's local storage (chrome.storage.local) and is not transmitted to external servers.

3. Information Not Collected

The Service does not collect any of the following information:

• Personal identification information such as name, email, phone number, address
• Account information (username, password)
• Cookies and session information
• IP addresses
• Device unique identifiers or browser fingerprints
• User browsing history or search records
• Coupang account information or payment/order information
• Location information

1. Server-side (Product Data)

Product-related data transmitted to the server (product ID, product name, price, etc.) is retained during the service operation period for the purpose of providing price history services. This data is publicly available product information and does not constitute personal information.

2. Local-side (Browser Storage)

Cooldown timestamps and ad status cache stored on user devices are immediately deleted when users uninstall the extension or clear browser data.

The Service does not provide collected product information to third parties. However, exceptions are made in the following cases:

1. When requested by relevant authorities for investigation purposes as required by law
2. When users have given prior consent

Regarding Affiliate Links: The Service participates in the Coupang Partners affiliate program. When users navigate to product pages through the extension, links or deeplinks containing Coupang Partners affiliate tags (lptag) may be used. This is in accordance with Coupang's affiliate program policies, and users' personal information is not provided to the Service operator in this process. Information received by the operator through Coupang Partners is limited to statistical information such as purchase counts and commission amounts, and does not include users' personal information (name, order details, etc.).

The Service entrusts information processing as follows for smooth service provision:

When entering entrustment contracts, we specify in the contract the prohibition of processing information beyond the purpose of performing entrusted tasks and security measures in accordance with the Personal Information Protection Act.

The Service takes the following measures to ensure information security:

1. Transmission Encryption: All communications with the server are encrypted through HTTPS (TLS) protocol.
2. Principle of Least Privilege: The extension requests only the minimum browser permissions necessary for service provision.
   • activeTab: Access to current active tab
   • scripting: Content script execution
   • storage: Local data storage
3. Host Permission Restrictions: The extension operates only on coupang.com and piryo.mupersei.com domains, and does not collect or process any data on other websites.
4. Local Data Isolation: Data stored locally is managed within the Chrome browser's extension sandbox.

1. Local Data

When users uninstall the extension or reset extension data in Chrome browser settings, all locally stored data (cooldown timestamps, ad status cache) is immediately deleted.

2. Server Data

Product price history data stored on the server is publicly available product information and is retained during the service operation period. When the service terminates, related data will be destroyed without delay.

3. Destruction Methods

• Electronic files: Permanently deleted using methods that prevent recovery
• Records and printed materials: Shredded or incinerated

1. Since the Service does not collect personal information, there is no personal information subject to requests for access, correction, deletion, or suspension of processing.
2. Users can remove all locally stored data at any time by uninstalling the extension.
3. For inquiries regarding product data stored on the server, please contact us using the information provided in Article 9.

We have designated a Privacy Officer as follows to oversee matters related to information processing and handle related complaints and remedies:

Users may contact the following organizations for damage relief and consultation regarding information infringement:

This Privacy Policy is effective from the effective date. If there are additions, deletions, or modifications to the content due to changes in laws, policies, or services, we will notify users through the Chrome Web Store or official channels at least 7 days before the changes take effect.

Current Privacy Policy Effective Date: February 22, 2026

[User Browser — Coupang Website]
        │
        │  Extract product ID, product name, price from product page
        │  (Publicly available information on Coupang website)
        ▼
[Piryo Extension (Content Script)]
        │
        ├──→ [Chrome Local Storage]
        │     · Cooldown timestamp (not sent to server)
        │     · Ad status cache (not sent to server)
        ▼
[Piryo Server (piryo.mupersei.com)] ← HTTPS encrypted communication
        · Product ID, Vendor Item ID, Item ID
        · Product name, Price
        ※ No personal information transmitted