Cookie Notice
Last updated: January 2026
What Are Cookies?
Cookies are small text files stored on your device when you visit a website. They help websites function properly and provide a better user experience. This notice explains how Purely Computer Science ("Purely CS") uses cookies and similar technologies.
Cookies We Use
Essential Cookies
These cookies are necessary for the website to function properly. They enable core functionality such as security, theme preferences (light/dark mode), and session management. You cannot opt out of these cookies as they are essential for the site to work.
Theme Preference
We store your theme preference (light or dark mode) locally on your device to remember your display settings when you return to the site.
Payment Processing (Stripe)
When processing donations, Stripe may set cookies to enable secure payment processing and fraud prevention. These cookies are governed by Stripe's privacy policy.
What We Don't Do
- We do not use advertising or marketing cookies
- We do not track you across other websites
- We do not sell cookie data to third parties
- We do not use cookies for behavioural profiling
Local Storage
In addition to cookies, we may use browser local storage to save your preferences such as:
- Theme preference (light/dark mode)
- Last visited topics for easier navigation
- Study progress (if applicable)
This data is stored only on your device and is never transmitted to our servers.
Managing Cookies
You can control and manage cookies through your browser settings. Most browsers allow you to:
- View what cookies are stored on your device
- Delete individual or all cookies
- Block cookies from specific or all websites
- Set preferences for first-party vs third-party cookies
Note that blocking essential cookies may affect the functionality of our website.
Updates to This Notice
We may update this Cookie Notice from time to time to reflect changes in our practices or for legal, operational, or regulatory reasons. The "Last updated" date at the top of this page indicates when the notice was last revised.
Contact Us
If you have any questions about our use of cookies, please contact us at: