GhostBoard — Privacy Policy

Last updated: October 5, 2026

1. Introduction

GhostBoard ("the Extension", "we", "our") is a free browser extension that provides a practice analysis board overlay on Chess.com. This privacy policy explains what data the Extension accesses and stores, and how that data is handled.

In short: nothing leaves your browser. GhostBoard makes no network requests, runs no analytics, does not track browsing behavior, and does not sell or share any data with anyone.

2. Data We Access But Do Not Collect or Transmit

a) Chess.com Page Content

The Extension reads the chess board position and move list from the Chess.com page DOM (Document Object Model) to synchronize pieces on the GhostBoard overlay. This data is processed entirely within your browser. It is never transmitted to any server, stored persistently, or shared with any third party.

b) Page URL

The Extension checks the current Chess.com page URL to determine whether GhostBoard should activate (e.g., /play/computer, /analysis, /puzzles). This check happens locally in your browser. URLs are never transmitted, logged, or stored.

3. Data We Store Locally

The Extension uses Chrome's built-in storage APIs (chrome.storage.sync and chrome.storage.local) to save only the following:

a) Theme Preferences

Your selected board color scheme and piece style, stored in chrome.storage.sync so your preferences persist across sessions and, if Chrome Sync is on, across your signed-in Chrome browsers.

b) Overlay Window Position and Size

If you move or resize the GhostBoard overlay, its last position and width are saved in chrome.storage.local so the overlay reopens in the same place on your next visit.

None of this data contains personally identifiable information, and none of it ever leaves your browser.

c) Data From Earlier Versions

Versions up to 1.0.8 offered a paid Pro license and a free trial, and stored a license key, Pro status, and an installation timestamp. Starting with version 1.1.0, every feature is free, the Pro license and trial have been removed, and the Extension automatically deletes that old license and trial data from your browser when it updates.

4. Data We Transmit

None. GhostBoard does not make any external network requests. It does not communicate with our servers (we have none), with Chess.com's servers, or with any third-party service.

5. Data We Do Not Collect

To be explicit, GhostBoard does NOT collect, store, or transmit:

• Your name, email address, or any account information
• Your Chess.com username or account details
• Your browsing history or activity on any website
• Your chess games, ratings, or performance data
• Cookies or tracking identifiers
• Device fingerprints or hardware information
• Location data
• Payment information
• Any data from websites other than Chess.com

6. Chrome Permissions Explained

a) storage

Used to save your theme preferences and the overlay's position and size. No data leaves your browser through this permission.

b) activeTab

Used to communicate between the popup interface and the Chess.com tab when you click the GhostBoard icon. This provides temporary access only to the tab you are actively viewing.

c) Host permission: *://*.chess.com/*

Required so the Extension's content script can run on Chess.com pages to read the board position and render the GhostBoard overlay.

7. Third-Party Services

GhostBoard does not use any third-party services. The Extension includes the following open-source libraries, which run entirely within your browser and make no external connections:

• jQuery (MIT License)
• chess.js (BSD License)
• chessboard.js (MIT License)

8. Data Retention and Deletion

All Extension data is stored in your Chrome browser's local and synced storage. You can delete all stored data at any time by:

• Uninstalling the Extension (Chrome removes all extension storage; synced data may take a short time to clear across all signed-in devices)
• Using Chrome's "Clear browsing data" feature for extension data
• Manually clearing extension storage via Chrome Developer Tools

We do not maintain any server-side database of user data. No data is ever sent to us, so nothing about you remains on our end.

9. Data Security

All data stored by the Extension resides within Chrome's built-in storage system, which is sandboxed and inaccessible to other extensions and websites. Because the Extension transmits no data, nothing is exposed in transit.

10. Children's Privacy

GhostBoard does not knowingly collect any personal information from children under the age of 13 (or the applicable age in your jurisdiction). The Extension does not collect personal information from any user.

11. Changes to This Policy

We may update this privacy policy to reflect changes in the Extension's functionality or to comply with legal requirements. When we make material changes, we will update the "Last updated" date at the top of this policy. Continued use of the Extension after changes constitutes acceptance of the updated policy.

12. Your Rights

Depending on your jurisdiction, you may have the right to:

• Access the data stored by the Extension (visible in Chrome's extension storage via Developer Tools)
• Delete all stored data (by uninstalling the Extension)
• Clear locally-saved overlay position by uninstalling the Extension or using Chrome's extension storage tools

Since we do not operate any servers that store your data, data access and deletion are fully within your control through your browser.

13. Contact

If you have questions about this privacy policy or the Extension's data practices, please contact:

• Email: ghostboard.support@gmail.com