Cookie declaration
This page lists every cookie and similar technology that mathepotamia.com uses, sorted by category, with its purpose and, where its provider states it, how long it is kept. Necessary cookies are always on. Statistics and marketing load only if you allow them.
Checkout takes place in our shop on Shopify. There, Shopify shows its own cookie banner and sets its own cookies. Shopify's cookie policy applies to these cookies, and they are not listed on this page.
- Version of this cookie declaration
- 2026-10-18
Changing or withdrawing your choice
You can change or withdraw your choice at any time. Select “Cookie settings” at the bottom of the page, and the cookie banner opens again. To withdraw your consent, select “Configure”, switch off Statistics and Marketing, and select “Save selection”. Your new choice applies from then on. When this declaration changes, we ask you again.
Necessary
These cookies make the website work. They are always on and cannot be switched off, because the website cannot work properly without them.
| Name | Provider | Purpose | Expiry | Type |
|---|---|---|---|---|
| NEXT_ | mathepotamia.com | Remembers the language version you chose, so the website keeps showing that language. | Session | HTTP cookie |
| SHOPIFY_ | mathepotamia.com | Stores the country picked in the country and currency selector, so products are shown with the prices and availability for that country. | Session | HTTP cookie |
| __ | mathepotamia.com | On product pages, records that the page was reloaded once after coming back with the browser's back button, for example from checkout, so the page stays usable and is not reloaded twice. | Session | HTML Session Storage |
| mp_ | mathepotamia.com | Stores your cookie choice, so you are not asked again on every page. | 12 months, or until the version of this declaration changes | HTTP cookie |
| cf_ | Cloudflare | Cloudflare Turnstile is the security check that protects our sign-up and contact forms against automated spam. Cloudflare may set these cookies during the check and describes them as strictly necessary. | Not stated by Cloudflare | HTTP cookie |
Statistics
We use Umami to understand how visitors use this website. Umami runs on our own server, and the data stays with us. It loads only if you allow statistics. Umami reads your screen size and browser language, and sends them with the address of the page you are on and the page you came from. The page address is recorded in full, except for the personal access codes in our confirmation emails, which are removed.
| Name | Provider | Purpose | Expiry | Type |
|---|---|---|---|---|
| umami.disabled | mathepotamia.com | Stores a flag that excludes this browser from our self-hosted Umami statistics. It is only set on request and contains no personal data. | Persistent | HTML Local Storage |
Marketing
Marketing tools, for example those from social networks, measure how our ads perform and show relevant ads on other platforms. Such tools load only if you allow marketing. Our website then loads Google Tag Manager from Google Ireland Ltd., the service through which we load marketing tools. No marketing tool is active at present, so for now Google Tag Manager loads none. Google Tag Manager sets no cookie of its own, but Google receives your browser's request for it, including your IP address. Before we add a marketing tool, we update this list and the version of this declaration, and we ask you again.
| Name | Provider | Purpose | Expiry | Type |
|---|---|---|---|---|
| Google Tag Manager | Loads the marketing tools listed in this category. The script is loaded from googletagmanager.com, and only once marketing has been allowed. | None, sets no cookie | Script |