Privacy Policy

Account information: When you create an account, we collect your email address and authentication-related information necessary to provide sign-up, login, and account management.

Usage data: We may collect information about how you interact with the Service, such as pages viewed, actions taken (for example, marking problems as solved/revising/not solved), approximate location derived from IP address, device/browser details, and timestamps. This may be collected via server logs, analytics, or similar technologies.

We use information we collect to:

• Provide and operate the Service (authentication, dashboards, progress tracking).
• Maintain, monitor, and improve performance, reliability, and user experience.
• Prevent fraud, abuse, and unauthorized access; enforce our terms and policies.
• Communicate with you about your account and Service-related updates.

We may use cookies and similar technologies to keep you signed in, remember preferences, and understand how the Service is used.

We may display ads via Google AdSense. Google and its partners may use cookies or similar identifiers to serve ads based on your visits to this and other websites. You can learn more about how Google uses information for advertising and how to control ad personalization through Google’s ad settings and privacy controls.

The Service relies on third-party providers to function. These providers may process information on our behalf, subject to their own terms and privacy practices.

• Supabase: used for authentication and data storage for features like progress tracking.
• Google: may be used for advertising (AdSense) and may be used to power AI-based hints and related functionality.
• LeetCode: problem links on OneStopDSA take you to LeetCode. We are not responsible for LeetCode’s content or privacy practices. Your use of LeetCode is governed by LeetCode’s policies.

We implement reasonable administrative, technical, and organizational safeguards designed to protect information. However, no method of transmission over the internet or method of electronic storage is completely secure, and we cannot guarantee absolute security.

If you have questions about this Privacy Policy, you can contact us at privacy@onestopdsa.com.

We may update this Privacy Policy from time to time. When we do, we will update the "Last updated" date at the top of this page. Your continued use of the Service after changes become effective means you accept the updated policy.