Cookie Policy
Last updated: 26 June 2026
BuildMetricLab keeps cookies to an absolute minimum. We set no advertising cookies and no cross-site tracking cookies. The only cookies on this site come from one optional analytics tool that loads only if you choose to accept it.
Optional analytics — Microsoft Clarity
If you accept analytics in the cookie banner, we load Microsoft Clarity to understand how the calculators are used, through aggregated heatmaps and anonymised session replays. This helps us find confusing layouts and steps that don't work well. Clarity sets two cookies:
_clck— identifies a returning visitor so page views group into one session. Expires after about a year._clsk— links page views within a single session. Expires at the end of the session.
Text you type into calculator fields is masked in your browser before anything is sent, so the values you enter are not captured. Clarity does not load — and these cookies are not set — unless you press Accept. You can withdraw consent by clearing site data, after which the banner reappears. For more, see Microsoft's Privacy Statement.
Strictly necessary local storage
The Site uses browser localStorage (not cookies) for two small preferences:
bml-theme— your chosen theme (lightordark). If the key is absent, your operating-system preference is used.cookie-consent— records your accept/reject choice so the banner does not reappear on every visit.
Both stay on your device and are never sent to us. Calculator inputs are not stored — refreshing the page resets them.
Anonymous usage logging (no cookies)
Separately, we record an anonymous, cookieless event when a calculator is used: the tool, the inputs and result, your approximate province/region and device type (from network request headers). It sets no cookie, stores nothing on your device, and contains no information that identifies you. Because it does not store or access information on your device, it does not require consent.
No other tracking
There are no Google Analytics, Facebook Pixel, or advertising tags on this site. If we add anything further that stores information on your device, we will update this page and request consent first.
Clearing data
You can clear the bml-theme and cookie-consent localStorage entries, and any Microsoft Clarity cookies, at any time via your browser's site-data settings.