Last Updated: November 2025
Cookies are small text files that are placed on your device when you visit a website. They are widely used to make websites work more efficiently and provide information to website owners. Cookies help us understand how you use our service and improve your experience.
System Design Sandbox uses cookies and similar tracking technologies to provide, improve, protect, and promote our Service. Below is a detailed breakdown of the types of cookies we use and their purposes.
These cookies are strictly necessary for the Service to function. Without these cookies, certain features would not work.
Authentication Cookies (Clerk)
Purpose: Manage user sessions and keep you logged in
Duration: Session or persistent (based on "Remember me")
Provider: Clerk.com
These cookies help us understand how visitors interact with our Service by collecting and reporting information anonymously.
PostHog Analytics
Purpose: Track user behavior, feature usage, and performance metrics
Duration: 1 year
Provider: PostHog Inc.
Data Collected: Page views, clicks, session recordings, user properties
Vercel Analytics
Purpose: Performance monitoring and web vitals
Duration: Session
Provider: Vercel Inc.
Data Collected: Performance metrics, page load times
These cookies enable enhanced functionality and personalization.
Theme Preferences
Purpose: Remember your dark/light mode preference
Duration: 1 year
Provider: First-party (System Design Sandbox)
In addition to cookies, we use browser local storage to enhance your experience:
Some cookies are placed by third-party services that appear on our pages. We do not control these cookies. The third parties include:
We use PostHog to record user sessions (screen recordings of how you interact with our Service). These recordings help us identify usability issues and improve the user experience. Session recordings never capture sensitive form inputs like passwords or payment information. You can opt out of session recording by enabling "Do Not Track" in your browser settings.
Most web browsers allow you to manage cookie preferences through browser settings. You can:
Please note that blocking or deleting cookies may impact the functionality of our Service.
We respect "Do Not Track" browser settings. When enabled, we will not track your session or record your interactions with PostHog.
Cookie data is retained for the following periods:
If you are located in the European Economic Area (EEA), you have certain rights regarding your personal data collected through cookies. Please see our Privacy Policy for more information about your rights and how to exercise them.
We may update this Cookie Policy from time to time to reflect changes in our practices or for other operational, legal, or regulatory reasons. We will notify you of any material changes by posting the updated policy on this page with a new "Last Updated" date.
If you have questions about our use of cookies, please contact us at: privacy@systemdesignsandbox.com