Privacy
Last updated: October 14, 2026.
Calculator & saved vials
Calculations run entirely in your browser. Saved vials are stored in your browser's localStorage on your device and are never sent to us. Clear them with the Delete button or by clearing site data.
Newsletter
If you subscribe, we store your email address, the signup time, the page you signed up from, and your approximate country (from Cloudflare) in a Cloudflare D1 database. We use it only to send occasional updates about this site. Ask us to delete it anytime at hello@unitstodraw.com or via the contact form.
Contact form
Messages you send (name if given, email if given, message, time, approximate country) are stored in the same Cloudflare D1 database so we can reply.
Spam protection
Forms use Cloudflare Turnstile, which processes limited technical signals to tell humans from bots. See Cloudflare's privacy policy.
Analytics & hosting
The site is hosted on Vercel and uses Vercel Web Analytics, which is cookieless and reports aggregate page views. Our hosts keep standard server logs.
Messages sent to hello@unitstodraw.com are forwarded by Cloudflare Email Routing to our inbox.
What we don't do
We don't sell or rent personal data, don't run ad trackers, and don't share your email with sponsors.