Privacy Policy

Chart Master (this site) operates according to the following policy regarding the handling of user personal information.

Personal Information Collection

We do not provide a contact form. When you contact us via X (formerly Twitter), we handle only the information necessary to exchange messages.

Cookies & Local Storage

We save user learning progress, settings, and achievements in browser local storage. This information is not transmitted to servers and is retained only on the user's device.

Access Analytics

We use Vercel Analytics and Speed Insights to collect access information for service improvement. These do not contain personally identifiable information.

Advertising

We may use third-party advertising services (Google AdSense) in the future. Google AdSense may use cookies to serve interest-based ads. For details on disabling cookies and Google AdSense policies, see Google's policies and terms.

Third-Party Services

We use yfinance (Yahoo Finance) for price data and Google Gemini API for image generation. No personally identifiable information is transmitted in these uses.

Policy Changes

This policy may change without notice. Changes take effect from the time of posting on this page.