Last updated · July 24, 2026
Cookie Policy
Which cookies we set, why we set them, and how to say no.
This Cookie Policy explains what cookies are, which ones Esoteric Numbers (https://www.esotericnumbers.com) uses, and how you can control them. We keep it simple: nothing non-essential runs until you say so, and you can change your mind at any time.
What Cookies Are
Small text files, plainly explained.
Cookies are small text files that a website stores on your device when you visit. They let the site remember things between pages and visits — your language, your preferences, or an anonymous identifier.
Similar technologies such as localStorage and pixels serve the same purpose; when this policy says cookies, it covers those too.
Cookies set by us are called first-party cookies. Cookies set by services we use, such as analytics or advertising providers, are called third-party cookies.
How We Use Cookies
Four purposes, nothing hidden.
We use cookies for four things: making the site work, remembering your preferences, understanding how the site is used, and funding the site through advertising.
The free calculators never involve cookies — names and birth dates you enter into them are processed entirely in your browser and are not stored or transmitted. Report orders and accounts are the exception and are covered in the Privacy Policy.
We do not use cookies to sell your personal data.
Strictly Necessary Cookies
The handful the site cannot work without.
These are required for the site to function and do not need your consent.
They include the cookie that records your cookie choices themselves, security tokens that protect forms against forgery, and session cookies if you sign in to an account.
Blocking these in your browser may break sign-in, checkout, and the consent banner.
Preference Cookies
So the site remembers how you like it.
These remember choices you make so the site feels the same on your next visit.
They include your language and region, your light or dark mode setting, and interface preferences such as dismissed banners.
Analytics and Performance
Understanding readers without identifying them.
With your consent, we use Google Analytics (GA4) to understand which pages are read and how visitors move through the site. IP addresses are anonymized.
We use New Relic and Sentry to monitor performance and errors, and Cloudflare for security and delivery. These process technical data such as browser type and load times.
Analytics cookies are only set after you accept them in the consent banner. Declining them does not change what you can do on the site.
Advertising Cookies
How ads keep the site free — on your terms.
We show ads through Google AdSense to keep the site free. Google may use cookies to measure ad performance and, with your consent, to personalize the ads you see.
Until you give consent, ad-related storage is denied by default (Google Consent Mode): any ads shown are non-personalized and use no advertising cookies.
Google's use of advertising cookies is described in Google's own privacy and ads policies, including how to opt out of personalized advertising across the web at adssettings.google.com.
Payments
Only at checkout, only through Stripe.
If you purchase a report, our payment processor Stripe sets cookies needed to process the transaction securely and to prevent fraud.
These cookies appear only on checkout pages and are governed by Stripe's privacy policy. We never see or store your card details.
Managing Your Consent
Your choices, changeable at any time.
On your first visit, our consent banner (powered by ConsentManager) asks which categories of cookies you allow. Nothing optional runs before you choose.
You can revisit and change your choices at any time — reopen the cookie settings from the banner icon that remains available on the site, withdraw consent, or switch individual categories on and off.
Withdrawing consent stops future cookies from being set; you can also clear existing ones in your browser at any time.
Browser Controls
Your browser has the final word.
Every modern browser lets you view, block, and delete cookies for any site — look for Cookies or Site Data in your browser's privacy settings.
You can also browse in private or incognito mode, where cookies are discarded when you close the window.
If you block all cookies, the site will still work, but preferences such as language and appearance will reset on every visit.
Updates and Contact
Where this policy goes from here.
We may update this policy as the site or regulations change; the date at the top always reflects the latest revision. Significant changes will be re-presented through the consent banner.
For details on how we handle personal data more broadly, see our Privacy Policy. Questions about cookies are always welcome via our contact page. Contact