Numbers Plain itself stores no calculator value, event identifier, or account cookie. Its current measurement is cookieless, while advertising storage remains inactive because the reserved ad units are empty.
Cookies this site sets
None of its own. The calculator keeps nothing between visits.
Analytics
The self-hosted Umami tracker records page views and the two property-free product events work_started and work_completed. It honours Do Not Track and receives no calculator input or result property.
Advertising and consent
The current build keeps every ad-unit identifier empty, so its lazy loader does not request the AdSense library and cannot set an advertising identifier.
Google's current publisher requirements explain the Google-certified consent platform required for personalised ads in the EEA, United Kingdom, and Switzerland. If ads are activated later, that choice surface must load before personalised advertising.
Declining personalised advertising must leave the calculator usable: the calculations run in this page and do not depend on advertising.