Privacy policy

The short version

StowMath does not sell your data, has no account system and carries no advertising at the time of writing. Every calculator runs entirely on your own device, and nothing you type into one is ever sent anywhere. The one thing the site does measure is traffic - which pages get visited, from roughly where - using Google Analytics, described in full below.

Your calculator inputs

When you type dimensions, weights, costs or duty rates into a calculator on this site, those numbers are processed by JavaScript running in your own browser. They are never transmitted to a server. StowMath is a static site with no backend, no API and no database, so there is nothing here to receive them.

The one third party this site contacts is Google Analytics, and it does not receive them either. A share link carries the whole calculation in the page address, so the address handed to Analytics has the calculation stripped out of it before it is sent - both for the page you are on and for the page you arrived from. What reaches Google is the path and nothing else. There is more on what it does collect under "Cookies and local storage" below.

This is a deliberate design decision, not an oversight. Shipment details are commercially sensitive: carton counts, container volumes and landed costs describe an order that may not be public yet. The safest way to handle that data is to never receive it.

Share links

Each calculator writes your inputs into the page address as you type, so that you can copy the link and send a result to a colleague or forwarder. That happens locally in your browser's address bar. The link is only shared if you choose to share it - but be aware that once you send it, the numbers in it are visible to whoever receives it, and to any system that link passes through.

Cookies and local storage

StowMath sets two cookies, both belonging to Google Analytics and both used only to count visits.

• _ga - a randomly generated identifier that lets Analytics recognise a returning browser rather than counting it as a new visitor each time. It expires after two years.
• _ga_LVEZ47Y1W8 - holds the state of the current visit for this specific site. It also expires after two years.

Neither contains anything you typed, and neither is used for advertising or sold to anybody. Blocking cookies for this domain, or using any content blocker that stops Google Analytics, costs you nothing - every calculator keeps working exactly as it does now.

It uses two localStorage entries. stowmath-themerecords whether you chose the light or dark theme, so the site does not flash the wrong one on your next visit; it contains the word light or dark and nothing else, and clearing it returns the site to its light default. stowmath-consent records your answer to the cookie banner and contains the word grantedor denied. Neither ever leaves your device and neither is an identifier.

Your cookie choice

A banner asks before Analytics cookies are set, and nothing is decided for you: Accept and Reject are the same size, neither is pre-selected, and closing the page without answering is treated as no answer rather than as agreement. Your choice is remembered on your device, and you can change it at any time with the Cookie choices link at the foot of every page.

The mechanism is Google Consent Mode. In the EEA, the United Kingdom and Switzerland, analytics storage starts denied and stays that way until you accept. Elsewhere it starts on and the banner is your opt-out. That split is deliberate rather than lazy - the consent duty is regional, so applying it worldwide would collect less than the law asks in one direction and more than it asks in the other.

One thing worth stating plainly, because most cookie notices leave it out. Consent Mode is not the same as blocking the script. While analytics storage is denied, no cookie is written and no identifier is stored, but the Analytics tag is still loaded and still sends a cookieless ping that cannot be tied to you or to a returning visit. If you would rather nothing was sent at all, any content blocker that stops Google Analytics achieves that, and every calculator on this site keeps working exactly as it does now.

Third parties

One. Loading a page causes your browser to contact Google, which supplies the Analytics script. Fonts are served from this domain rather than a font CDN, and there is no embedded video, no social widget and no advertising code, so Google is the only other company involved.

Google Analytics

Analytics tells us how many people reach each calculator and roughly where from, which is what decides which tool gets built next. It records the page you viewed, an approximate location derived from your IP address, and basic device and browser information. It does not receive your calculator inputs - those never leave your browser, including the numbers in a share link.

The data is processed by Google under Google's privacy policy. You can opt out across every site that uses Analytics with Google's official opt-out add-on, or simply block the domain googletagmanager.com.

Server logs

The site is hosted on Cloudflare Pages. Like any web host, Cloudflare processes the technical request data needed to serve a page - IP address, user agent, requested URL, timestamp. StowMath does not have access to per-visitor logs and does not use this data for profiling. It is governed by Cloudflare's own privacy terms.

Advertising

There is no advertising on this site today. The intention is to apply for Google AdSense once the site is established, and advertising is the planned business model - there is no paid tier and no plan to sell data.

If and when advertising is introduced, it will set cookies and this page will be updated before any ad code goes live, with the specifics of what is set and how to control it. Until you see that update, the statements above hold.

Children

This site is a professional tool for people working in freight and trade. It is not directed at children and collects no data from anyone, including children.

Changes to this policy

Any material change will be reflected in the last-updated date at the top of this page. The rule this site holds itself to is that the page is updated in the same change that alters what is collected, never after it - Analytics was added that way, and advertising will be too.

Contact

Questions about privacy, or anything else, go to hello@stowmath.com.