Privacy Policy

1.1 CalcBox is a privacy-focused mathematical calculation tool. Our design principle is to minimize data collection and maximize user privacy protection.

1.2 We do not actively collect your personal identification information, such as name, email, phone number, etc.

1.3 All mathematical calculation processes are completed locally in your browser, and calculation data is not uploaded to our servers.

2.1 To improve user experience, we store the following information in your browser:

• Theme preferences (dark/light mode)
• Language preferences (Chinese/English)
• Calculation history (saved only in your browser)
• User interface customization settings

2.2 This information is stored in your browser's LocalStorage and is not sent to our servers.

2.3 You can delete this locally stored information at any time by clearing your browser data.

3.1 We only use necessary functional cookies to ensure the website operates properly, including:

• Session state management
• User preference settings storage
• Website performance optimization

3.2 We do not use advertising cookies or third-party tracking cookies.

3.3 You can disable cookies in your browser settings, but this may affect some website functionality.

4.1 To improve user experience and website performance, we may use the following third-party services:

4.2 All third-party services follow strict data protection standards and do not access your calculation data.

5.1 Technical security measures:

• Use HTTPS encryption protocol to protect data transmission
• Adopt modern web security standards
• Regular security updates and vulnerability fixes
• Client-side encrypted calculations, servers cannot access calculation content

5.2 Access control: We strictly limit system access permissions, with only authorized personnel able to access necessary system resources.

5.3 Data minimization: We follow the principle of data minimization, collecting and processing only necessary information.

6.1 Right of access: You have the right to understand the information we collect and process about you.

6.2 Right of deletion: You can request deletion of personal information we store about you (if applicable).

6.3 Right of rectification: If you find that the information we store is inaccurate, you can request correction.

6.4 Data portability: You have the right to obtain your personal data in a structured, commonly used, and machine-readable format.

6.5 Since our service is designed to be privacy-friendly, most user data is stored in your local browser, giving you direct control over this data.

7.1 Our service is suitable for users of all ages, including children and adolescents.

7.2 We do not knowingly collect personal information from children under 13. If we discover we have collected such information, we will delete it immediately.

7.3 We encourage parents and guardians to supervise children's internet usage activities.

8.1 Due to our use of CDN and other global services, your technical information may be transmitted between different countries and regions.

8.2 All international data transfers employ appropriate protective measures to ensure data security.

8.3 Importantly, your actual calculation data never leaves your browser, so there are no international transfer concerns.

9.1 We may periodically update this privacy policy to reflect service changes or legal requirements.

9.2 Significant updates will be prominently posted on this page and the "Last Modified Date" will be updated.

9.3 We recommend regularly reviewing this policy to stay informed of the latest information.

9.4 Continued use of our service indicates acceptance of the updated privacy policy.