Privacy Policy

Last updated: 7 June 2026

BuildMetricLab is operated by Brightscale Labs Limited

(registered in England & Wales). We take your privacy seriously and

process personal data in accordance with the UK General Data

Protection Regulation (UK GDPR) and the Data Protection Act 2018.

What we collect

• Calculator inputs: the numbers you type into calculators are

processed locally in your browser. They are not transmitted to

our servers or stored on our end.

• Anonymous usage analytics (no cookies): when a calculator is used

we record an anonymous event containing the tool, the inputs and

result, approximate country/region and device type (from network

headers). It contains no cookies, no IP addresses, and no information

that can identify you personally.

• Optional analytics — Microsoft Clarity: if you accept analytics in

the cookie banner, we load Microsoft Clarity, which records aggregated

heatmaps and anonymised session replays to help us improve the tools.

Input fields are masked, so the values you type are not captured.

Clarity runs only with your consent and you can withdraw it by

clearing site data. See our Cookie Policy for the cookies it sets.

• Voluntary feedback: if you submit feedback through the site, we

store the message plus any contact email you choose to provide, to

reply to you. You can request deletion at any time.

What we do not do

• We do not set advertising cookies; we set analytics cookies only

if you accept them.

• We do not sell personal data to third parties.
• We do not share your calculator inputs with anyone.
• We do not use your data to train AI models.

Who processes your data

• Microsoft (Clarity) — heatmaps and session replay, only after you

consent. See Microsoft's Privacy Statement.

• Cloudflare — hosting, content delivery, and the worker that records

the anonymous, cookieless usage events described above.

Legal basis

The anonymous, cookieless usage analytics rely on our **legitimate

interest** in understanding site usage to improve the tools. Microsoft

Clarity relies on your consent (pressing Accept in the cookie banner).

Feedback correspondence relies on your consent (pressing Send).

Your rights

Under UK GDPR you may request access to, correction of, or deletion

of any personal data we hold about you, and object to processing.

Contact: [email protected].

If you are unhappy with how we handle your data you may complain to

the Information Commissioner's Office (ico.org.uk).