Our own storage
Instead of cookies, the site uses local storage in your browser. Nothing in it is sent to a server.
| Key | Purpose | Kept until |
|---|---|---|
| ucl-prefs | Light or dark mode, degrees or radians, Letter or A4 | You clear it |
| ucl-practice | Practice progress, best scores and practice settings | You reset or clear it |
These items are needed for features you choose to use, and they are not used for tracking.
Google AdSense cookies
The site shows ads from Google AdSense. When ads are served, Google and its advertising partners may set and read cookies or use similar technologies on your device. They are used to show ads, limit repetition, measure performance, detect fraud and, only if you allow it, personalize ads based on your interests. Google describes these cookies at How Google uses cookies.
Your consent
Visitors in the European Economic Area, the United Kingdom and Switzerland see a consent message from Google’s certified consent management platform before any non-essential cookies are used. You can accept, reject or choose by purpose, and you can change your decision later with the privacy settings link or button that the message adds to the page. Visitors in US states with privacy laws can use the same message to opt out of the sale or sharing of their personal information.
Managing cookies in your browser
You can also block or delete cookies and site data in your browser settings. Blocking cookies does not stop the tools from working; blocking local storage only means your preferences and progress will not be remembered.
More information
See the Privacy Policy or write to info@unitcirclelab.com.
Last updated: October 23, 2026