Privacy Policy
Last updated: November 30, 2025
TL;DR for engineers: We collect minimal data (just what's needed for authentication and your learning progress). We don't sell your data. Period. Anonymous usage stats help us improve the platform. Your payment info goes directly to our payment processor, we never see it.
What We Collect
Authentication Data
- Name
- Email address
- Profile picture
Learning Progress Data
- Cards you've studied
- Your confidence ratings
- Review schedules
- Daily usage metrics
Subscription Data
- Subscription type (6 Months/1 Year/Free)
- Subscription status and dates
- Payment transaction ID (no payment details)
Note: Payment processing is handled entirely by our payment processor. We never see or store your credit card information, billing address, or any payment details.
What We DON'T Do
- ❌ We don't sell your data to third parties
- ❌ We don't share your personal information with advertisers
- ❌ We don't track you across other websites
- ❌ We don't send promotional emails (unless you explicitly opt in)
How We Use Your Data
- To provide the service: Your learning progress is stored so you can pick up where you left off
- To manage your account: Authentication and subscription status
- To improve the platform: Anonymous, aggregated usage statistics help us understand which features are valuable and what needs improvement
- To comply with legal obligations: We may need to retain certain data for legal/financial record-keeping
Third-Party Services
Authentication Service
We use Google's authentication service for secure sign-in. Google's privacy policy applies to the authentication process. We only receive the basic profile information you approve.
Payment Processor
All payment processing is handled by a PCI-DSS compliant payment processor. They handle all payment data securely. We only receive confirmation of your subscription status, never your payment details.
Anonymous Analytics
We may share anonymous, aggregated usage data with analytics services to improve site performance and user experience. This data cannot be used to identify individual users.
Data Storage & Security
- Your data is stored in a secure database with authentication enabled
- We use industry-standard security practices to protect your information
- All connections use HTTPS encryption
- We retain your data as long as your account is active. You can request deletion at any time.
Your Rights
You have the right to:
- Access your personal data
- Request correction of inaccurate data
- Request deletion of your account and data
- Export your learning progress data
- Opt out of non-essential data collection
Cookies
We use essential cookies for:
- Session management (keeping you logged in)
- Authentication and security
We don't use tracking cookies or third-party advertising cookies.
Updates to This Policy
We may update this privacy policy from time to time. We'll notify you of significant changes by email or through a notice on the platform. Continued use of System Overflow after changes constitutes acceptance of the updated policy.
Contact Us
Questions about privacy? We're engineers too, we get it.
Email us at: [email protected]