Privacy policy

Last updated November 3, 2026.

Calculators and saved tanks

All calculations run in your browser. Saved tanks and product plans are stored in your browser's local storage on your device. We never receive them. Clearing your site data deletes them; use the export button on My tanks to keep a backup.

Plus waitlist

If you join the waitlist we store your email address, the optional plan choice, the page you joined from, the time, your approximate country (from Cloudflare) and your browser's user-agent. We keep a salted hash of your IP address for up to 24 hours to stop abuse. We use your email only to tell you when Plus launches. Ask us to delete it at any time and we will.

Analytics

We use Cloudflare Web Analytics, which is cookie-free and does not track you across sites. It counts page views and performance.

Hosting

The site is hosted on Cloudflare Pages; the waitlist is stored in Cloudflare D1. Cloudflare processes request data to deliver and protect the site.

Cookies

We set no cookies.

Affiliate links

Some "where to buy" links may become affiliate links in the future. If they do, they will be labeled, and the retailer may use its own cookies after you click.

Children

The site is not directed at children under 13.

Changes

We will update this page when anything changes.