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BirthdayLab

Privacy policy

This page describes how BirthdayLab handles your information. It is written in present tense for what we do today — which now includes Google Analytics 4 — and clearly marked future tense for services we still plan to add (advertising and an EU/EEA consent banner). When those services are wired up, this page is updated in the same deploy.

Who we are

BirthdayLab is operated by Moving Data Systems, d.o.o., a company registered in Slovenia, EU. For the purposes of EU data-protection law, Moving Data Systems, d.o.o. is the data controller for this site. Contact for any privacy question or request is hello@birthdaylab.net or via the contact page.

What we collect today

Tool inputs are processed in your browser. Every calculator on this site — the Birthday Rarity Calculator, Age Calculator, Day of the Week Born, Leap Year, Generation Calculator, Birthday Countdown, Birthday Twins, and the Birthday Paradox simulator — runs as client-side JavaScript. The date or year you enter is computed in your browser and is never sent to or stored by our application.

When you press Calculate (or load a shared deep-link like ?d=08-15), the URL in your address bar updates so the result is shareable and reproducible. We don't capture that input on our application servers — there are no application servers that receive it.

Standard hosting logs. The site is served from Vercel. As with any web service, the hosting provider's standard HTTP request logs may record requested URLs (which can include the query parameters of a shared deep-link), along with timestamp, IP address, and user agent. These logs exist for operational and security purposes only — they are not joined to identity, not used for analytics, and not used for advertising.

No accounts, no logins, no submitted PII. We do not run user accounts, comment systems, or forms that store personal information. The only personal information that reaches us is what you choose to put in the body of an email when you write to the contact address above.

Cookies and similar technologies

BirthdayLab sets no first-party cookies of its own. It does embed one third-party analytics script — Google Analytics 4 — which sets analytics cookies under the conditions described below. No advertising scripts are loaded yet.

  • Essential. None. We do not use any cookies that would qualify as strictly necessary for the site to function.
  • Analytics (active). Google Analytics 4 sets cookies to measure aggregate usage. See "Analytics" below for the consent rules that govern when they are set.
  • Advertising (planned). See "Advertising" below. No advertising cookies are set today.

For visitors in the EU/EEA and the UK, analytics cookies are denied by default and are not set until consent is granted (see "Consent management"). Advertising cookies are denied for everyone until ads launch.

Analytics

BirthdayLab uses Google Analytics 4 (property G-7FTR2VPKHH) to understand site usage in aggregate. Where it is allowed to run, GA4 sets cookies and collects device and browser information, pages viewed, and an approximate location derived from your IP address. Google processes this data on our behalf; we do not use it to identify you.

We use Google Consent Mode v2 to control when GA4 may use cookies. For visitors in the EU/EEA and the UK, analytics storage is denied by default — no analytics cookie is set, and GA4 runs only in a cookieless, consent-pending mode until consent is granted. For visitors elsewhere, analytics storage is granted and GA4 sets its cookies. Advertising consent signals are denied for everyone until advertising launches.

Google retains GA4 event data for the period configured in the property; Google's available retention settings are 2 or 14 months. You can read how Google uses information from sites that use its services at policies.google.com/technologies/partner-sites. You can also install the Google Analytics opt-out browser add-on to stop your data being used by GA4 on any site.

Advertising (planned)

BirthdayLab will display ads through Google AdSense. When advertising is enabled, third-party vendors, including Google, will use cookies to serve ads based on a user's prior visits to this and other websites. Google's use of advertising cookies will enable it and its partners to serve ads to users based on their visit to this site and/or other sites on the internet.

You can opt out of personalised advertising by visiting Google Ads Settings. Information about how Google uses data from sites and apps that use its services is published at policies.google.com/technologies/partner-sites. You can also opt out of many third-party vendors' cookies at aboutads.info.

Additional advertising partners (placeholder)

When Raptive becomes an additional advertising partner for BirthdayLab, this section will name Raptive and its advertising partners and link to Raptive's published privacy and consent resources. Until then, the disclosures in the "Advertising" section above cover all planned advertising activity.

BirthdayLab uses Google Consent Mode v2. Today, EU/EEA and UK visitors have analytics and advertising storage denied by default, so no non-essential cookie is set for them — GA4 runs only in its cookieless, consent-pending mode in those regions.

A Google-certified Consent Management Platform (CMP) banner is still planned. It will let EU/EEA and UK visitors actively grant or refuse analytics cookies and change that choice at any time. Until it ships, the safe default above applies and no analytics cookie is set in those regions; advertising consent stays denied for all visitors until ads launch.

Your rights under the GDPR

Because Moving Data Systems, d.o.o. is established in the EU, the EU General Data Protection Regulation (GDPR) applies. You have the right to access information we hold about you, to request rectification or erasure, to object to processing, and to withdraw any consent you previously gave. You may exercise any of these rights by writing to hello@birthdaylab.net.

You also have the right to lodge a complaint with a supervisory authority. The relevant authority for Moving Data Systems, d.o.o. is the Slovenian Information Commissioner (Informacijski pooblaščenec).

Data retention and sharing

We do not sell personal data. The data collected by Google Analytics is handled under Google's own policies for the retention period configured in the property (see "Analytics"). When advertising goes live, the data those services collect will likewise be handled under Google's (and, where applicable, Raptive's) own policies, which we will link here at that point.

Children

BirthdayLab is a general-audience reference site and is not directed to children under 13 (or under 16 in jurisdictions that apply that age). We do not knowingly collect personal information from children.

International data transfers

Hosting (Vercel), the analytics service (Google Analytics), and the planned advertising services (Google) are provided by U.S.-based companies. Any processing of personal data they perform on our behalf is subject to their own published safeguards, including applicable Standard Contractual Clauses and adequacy mechanisms.

Changes to this policy

Analytics is now live, and the sections above describe it in present tense. The next material change to this page will be when advertising and the consent banner go live: those "planned" sections will be rewritten in present tense and the "last reviewed" date below bumped in the same deploy. We may also make smaller revisions for clarity at any time.

Last reviewed .