Last updated: January 2026. This policy explains what data LeeChuanjing collects and how it is used.
Calculations stay on your device
All calculators run as JavaScript in your browser. The numbers you type are never sent to our servers. We do not maintain user accounts and we do not store your inputs.
Cookies and analytics
By default, LeeChuanjing sets no advertising or analytics cookies. We may later load privacy-friendly, aggregate analytics that do not identify you; if so, we will update this page and provide a consent control.
Advertising
If we enable Google AdSense or similar advertising, those providers may use cookies to serve relevant ads and to measure them. Ad and analytics cookies are separate from the calculators, and you can block them in your browser without losing any tool functionality. Ad providers' use of data is governed by their own policies.
Log data
Our hosting provider may record standard server logs (IP address, requested page, browser type) for security and uptime. These logs are not combined with your calculator inputs and are retained only as long as needed for operations.
Your choices
- Use all tools with cookies disabled - nothing breaks.
- Clear cookies anytime through your browser settings.
- Contact us at hello@leechuanjing.com with any privacy question.