🔒 Privacy Policy

👋 Hi there! We believe in being fully transparent about your data. This policy explains exactly what we collect, how we use it, and your rights — in plain language. No legalese, just the facts.

1. Introduction

Welcome to DerivativeCalculus.com ("we," "our," or "us"). We respect your privacy and are committed to protecting any personal information you share with us. This Privacy Policy explains how we collect, use, disclose, and safeguard your information when you visit our website.

We process your data in accordance with applicable privacy laws, including the California Consumer Privacy Act (CCPA) and the EU General Data Protection Regulation (GDPR). By using DerivativeCalculus.com, you agree to the collection and use of information in accordance with this policy.

2. Content Accuracy

We strive to ensure that all mathematical content, calculators, and explanations on DerivativeCalculus.com are accurate and reliable. Our editorial process includes multi-step verification, peer review, and regular updates. However, mathematics can be complex and errors may occasionally occur.

We recommend verifying critical results using primary sources or additional tools, especially for academic or professional use. DerivativeCalculus.com is an educational resource and should not be the sole basis for important decisions. For a full account of our accuracy standards, see our Trust & Methodology page.

3. Information We Collect

3.1 Information You Provide to Us

We collect information that you voluntarily provide when you:

• Contact us: Name, email address, and message content through our contact form
• Subscribe to our newsletter: Email address (if we offer this feature)
• Report bugs: Technical information about the issue you're experiencing

3.2 Information Automatically Collected

When you visit our website, we automatically collect certain information about your device and usage, including:

• Device Information: IP address, browser type, operating system, device type
• Usage Data: Pages viewed, time on page, links clicked, referring website
• Cookies and Tracking: We use cookies and similar technologies (see Section 6)

4. How We Use Your Information

4.1 To Provide Our Services

• Operate and maintain our derivative calculators and educational tools
• Process your calculations and display results (client-side only)
• Provide step-by-step solutions and educational content
• Respond to your inquiries and support requests

4.2 To Improve Our Website

• Analyse usage patterns to improve functionality and content
• Identify and fix technical issues
• Develop new features and calculators
• Optimise performance and user experience

4.3 To Communicate With You

• Respond to your questions and support requests
• Send important updates about our service
• Notify you of new features or calculators (only if you opted in)

4.4 For Analytics

• Understand how users interact with our site to improve our content
• Measure the effectiveness of educational materials
• We do not currently display third-party advertisements

5. How We Share Your Information

We do not sell, trade, or rent your personal information to third parties. We may share information only in the following limited circumstances:

5.1 Service Providers

We may share information with trusted third-party service providers who help us operate our website, including:

• Hosting Providers: To store and serve our website (e.g., Hostinger)
• Analytics Services: To understand usage patterns (e.g., Google Analytics)
• Email Services: To respond to your inquiries
• We do not currently use advertising networks

These providers are contractually obligated to protect your information and use it only for the services they provide to us.

5.2 Legal Requirements

We may disclose your information if required by law or in response to valid legal requests, such as court orders, legal proceedings, government investigations, or to protect our rights, property, or safety.

5.3 Business Transfers

If we are involved in a merger, acquisition, or sale of assets, your information may be transferred as part of that transaction. We will notify you of any such change in advance.

6. Cookies and Tracking Technologies

6.1 What Are Cookies?

Cookies are small text files stored on your device when you visit a website. They help us provide a better user experience and understand how you use our site.

6.2 Types of Cookies We Use

• Essential Cookies: Necessary for the website to function properly (e.g., remembering your calculator preferences)
• Analytics Cookies: Help us understand how visitors use our site (e.g., Google Analytics)
• Preference Cookies: Remember your settings like display mode or variable preferences

6.3 Your Cookie Choices

You can control cookies through your browser settings. Most browsers allow you to refuse or delete cookies. Note that blocking essential cookies may affect website functionality.

7. Advertising

We do not currently display third-party advertisements on DerivativeCalculus.com. If this changes in the future, we will update this policy and provide appropriate controls.

7.1 Third-Party Links

Our website may contain links to third-party websites such as textbook retailers or educational platforms. We are not responsible for the privacy practices of these external sites. Please review their privacy policies before providing any personal information.

7.2 Analytics Services

We use Google Analytics to understand how visitors use our website — what pages they view, how long they stay, and how they arrived. You can opt out by installing the Google Analytics Opt-out Browser Add-on.

8. Data Security

We implement appropriate technical and organisational measures to protect your information, including:

• Encryption: HTTPS encryption for all data transmission
• Secure Hosting: Reputable hosting providers with their own security measures
• Access Controls: Limited internal access to any personal information
• Regular Updates: Keeping our systems patched and up to date

No method of transmission over the Internet is 100% secure. While we strive to protect your information using industry-standard measures, we cannot guarantee absolute security.

9. Data Retention

We retain your information only as long as necessary for the purposes outlined in this policy:

• Contact Form Data: Retained for 2 years or until your inquiry is resolved
• Analytics Data: Retained according to our analytics provider's policies (typically 26 months for Google Analytics)
• Calculation Data: Never stored on our servers — processed client-side only and discarded immediately

10. Your Privacy Rights

Depending on your location, you may have rights regarding your personal information:

10.1 General Rights

• Access: Request a copy of the information we hold about you
• Correction: Request correction of inaccurate information
• Deletion: Request deletion of your personal information
• Objection: Object to our processing of your information
• Portability: Request transfer of your data to another service

10.2 For EU/EEA Users (GDPR)

If you are in the European Union or European Economic Area, you have additional rights under the General Data Protection Regulation (GDPR), including the right to withdraw consent at any time, lodge a complaint with a supervisory authority, and restrict processing.

10.3 For California Users (CCPA)

If you are a California resident, you have rights under the California Consumer Privacy Act (CCPA), including the right to know what personal information is collected, the right to know if your information is sold or disclosed, the right to opt-out of the sale of personal information, and the right to non-discrimination for exercising your rights.

Opt-out statement: We do not sell your personal information. If we ever change this practice, we will update this policy and provide a clear opt-out mechanism.

10.4 How to Exercise Your Rights

To exercise any of these rights, please contact us at privacy@derivativecalculus.com or use our contact form. We will respond within 30 days.

11. Children's Privacy

Our website is designed for students of all ages, including minors. However, we do not knowingly collect personal information from children under 13 without verifiable parental consent. If you are a parent or guardian and believe your child has provided us with personal information, please contact us and we will delete it promptly.

12. International Data Transfers

Your information may be transferred to and processed in countries other than your own. These countries may have data protection laws that differ from your jurisdiction. By using our website, you consent to the transfer of your information to these countries. We take steps to ensure that any such transfers comply with applicable law.

13. Changes to This Privacy Policy

We may update this Privacy Policy from time to time to reflect changes in our practices or legal requirements. We will notify you of any material changes by:

• Posting the updated policy on this page with a new "Last Updated" date
• Sending an email notification (if you provided your email address)

We encourage you to review this policy periodically. Your continued use of our website after changes indicates your acceptance of the updated policy.

14. Contact Us

If you have any questions, concerns, or requests regarding this Privacy Policy or our data practices, please reach out:

15. Summary of Key Points

Here's everything that matters, at a glance:

This Privacy Policy is effective as of February 18, 2026. Last reviewed and updated: February 28, 2026.