Privacy Policy

Introduction

Math Mastery ("we," "our," or "us") is committed to protecting your privacy. This Privacy Policy explains how we collect, use, and safeguard your information when you use our website and educational application.

Information We Collect

Free Version (No Account Required)

The free version of Math Mastery stores all data locally on your device using browser localStorage. This means:

• We do NOT collect any personal information
• We do NOT store data on our servers
• Student names and progress stay on your device only
• No email, phone number, or account required

Premium Version (When Available)

When you subscribe to our premium service, we will collect:

• Email address (for account login and communication)
• Payment information (processed securely by Stripe)
• Student progress data (stored securely for cloud sync)

Third-Party Services

Google AdSense

The free version of Math Mastery displays advertisements served by Google AdSense. Google AdSense uses cookies and web beacons to serve ads based on your prior visits to our website or other websites on the internet.

Google's use of advertising cookies enables it and its partners to serve ads based on your visit to our site and/or other sites on the Internet. You may opt out of personalized advertising by visiting Google Ads Settings.

Payment Processing (Premium)

Payment processing for premium subscriptions is handled by Stripe. We do not store your credit card information. Please review Stripe's privacy policy at stripe.com/privacy.

How We Use Your Information

We use the information we collect to:

• Provide and maintain our educational service
• Display relevant advertisements (free version only)
• Process payments (premium version)
• Sync data across devices (premium version)
• Send important service updates
• Respond to support requests

Children's Privacy

Math Mastery is designed for students in grades K-5, which includes children under 13. We take children's privacy seriously and comply with the Children's Online Privacy Protection Act (COPPA):

• We do NOT knowingly collect personal information from children under 13
• The free version requires no personal information at all
• Premium accounts must be created by a parent or guardian (18+)
• We do NOT display targeted ads to children
• All ads are family-safe and screened by Google AdSense

Data Storage and Security

Free Version: All data is stored locally in your browser. We do not have access to this data. You can clear it at any time by clearing your browser data.

Premium Version: Data is encrypted in transit and at rest. We use industry-standard security measures to protect your information. However, no method of transmission over the Internet is 100% secure.

Cookies and Tracking

We use cookies for:

• Essential cookies: Required for the site to function (saved settings, login status)
• Analytics cookies: To understand how visitors use our site (optional)
• Advertising cookies: Google AdSense cookies for displaying ads (free version only)

You can control cookies through your browser settings. Note that disabling cookies may limit some functionality.

Your Rights

You have the right to:

• Access your personal data
• Correct inaccurate data
• Delete your data (premium accounts)
• Export your data (premium accounts)
• Opt out of marketing communications
• Opt out of personalized advertising

Data Retention

Free Version: Data stays on your device until you clear your browser data.

Premium Version: We retain your data while your account is active. After account deletion, data is removed within 30 days.

Changes to This Policy

We may update this Privacy Policy from time to time. We will notify you of any changes by posting the new Privacy Policy on this page and updating the "Last updated" date.

Contact Us

If you have questions about this Privacy Policy, please contact us at:

Email: privacy@mathmastery.com
Website: Math Mastery Homepage

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Additional Information for California Residents (CCPA)

If you are a California resident, you have additional rights under the California Consumer Privacy Act (CCPA):

• Right to know what personal information is collected
• Right to know if personal information is sold or disclosed
• Right to opt-out of the sale of personal information
• Right to deletion of personal information
• Right to non-discrimination for exercising CCPA rights

Note: We do not sell personal information to third parties.

Additional Information for EU Residents (GDPR)

If you are in the European Economic Area (EEA), you have rights under the General Data Protection Regulation (GDPR):

• Right of access to your personal data
• Right to rectification of inaccurate data
• Right to erasure ("right to be forgotten")
• Right to restriction of processing
• Right to data portability
• Right to object to processing