Privacy Policy: Zero-Tracking Architecture
Your drink inputs, weight, sex, and calculated BAC levels never leave your local browser.
Our Absolute Privacy Commitments
- ✓ No Server-Side Processing: Calculations are pure mathematical functions executed in client JavaScript.
- ✓ No Drink Logs: We do not log, store, or transmit what you drink, when you drank it, or what your calculated BAC was.
- ✓ No Accounts or Sign-Ups: We never require an email address, phone number, or login credentials.
- ✓ No Rehab Advertising Pixels: We do not deploy lead-generation tracking tags that profile users based on BAC calculation behavior.
What Local Storage We Use
We use your browser's local storage solely to store your display and interface preferences:
bac_calc_theme: Remembers whether you selected light or dark mode.bac_calc_region: Remembers whether you prefer US or UK units.bac_calc_cmp_acknowledged: Remembers that you reviewed our privacy notice.
All access to localStorage is wrapped in error-handling blocks to support private browsing modes without exceptions.
Shareable Links ("Copy Link")
If you use the optional "Copy link" feature, your entered drink list and settings are encoded strictly into the URL hash (#state=...). Because URL hash fragments are handled exclusively by your local browser and are never transmitted to web servers in HTTP requests, your scenario details remain completely private.
Third-Party Hosting & Content Delivery
BAC-CALC.COM is hosted on secure, distributed static infrastructure (Cloudflare Pages). When you request pages, standard web server access logs (IP address, user agent, requested file URL) may be logged transiently for security, DDoS mitigation, and reliability monitoring.