Summary
- Blood types you enter into our calculators are used only in your browser to produce results, and are not sent to us or saved. Shared and copied links point to the plain tool page and do not contain your selections.
- We do not require accounts. The contact form asks for your email address, category, message, and optionally your name.
- Contact form information is transmitted through Resend so the site operator can respond, handle corrections, or address legal and privacy requests.
- We use privacy-friendly Vercel Web Analytics for aggregate usage, Google AdSense for advertising, and Google Analytics only if it is explicitly configured.
- You can manage cookie and ad personalisation choices at any time.
How the calculators handle what you enter
Our calculators run entirely in your browser. The blood types you select and the results shown are not transmitted to or stored on our servers, and we do not put them in the page URL, cookies, local storage, or analytics events. When you move a selection from one tool to another, it is passed in temporary in-browser memory that is cleared when you reload or close the tab. “Copy tool link” copies the plain page address, not your selections, and printing produces a local document only.
Contact form information
If you use the contact form, we collect the information you voluntarily submit: your email address, selected category, message, and your name if you choose to provide it. This information is transmitted to the site operator through Resend and is used only to respond to your inquiry, handle a suggested correction, or address a legal or privacy request. The website does not publish your submission.
The application itself does not save contact submissions in a database. Resend and the email providers that transmit and receive the message may retain data under their own policies and operational requirements. See the Resend privacy policy. Do not submit blood-test results, medical records, or other sensitive health information.
Information collected automatically
Like most websites, our hosting provider (Vercel) records standard request logs, such as IP address, browser type, pages requested and timestamps, for security and reliability. We use Vercel Web Analytics, which collects aggregate usage metrics (for example page views and general location and device information) without using cookies and without building advertising profiles. If Google Analytics is explicitly enabled for the site, it is configured with IP anonymization and without advertising signals; note that Google Analytics is not automatically anonymous by default, so we rely on that configuration. We use these metrics only to understand which content is useful and to improve the site.
Advertising and your privacy choices
We display advertising through Google AdSense. Google and its partners may use cookies or similar technologies to serve ads based on your prior visits to this and other websites, and to measure ad performance. Where required by law, a consent message from Google's certified consent management platform is shown before personalised advertising or analytics cookies are set.
To review or change the choices you made in that message, use the button below. If the message is still loading, is not applicable in your region, or is blocked by your browser, the options beneath it let you manage advertising directly.
You can also opt out of personalised advertising in Google Ads Settings or via the aboutads.info opt-out tool. If you are in a U.S. state with opt-out rights, you can use the “Do not sell or share my personal information” choice in the consent message together with these ad-settings controls. Google's use of data is described in How Google uses information from sites that use its services.
Questions about your privacy choices? Visit our contact page.
Your rights
Depending on where you live (for example under GDPR in the EEA/UK or CCPA/CPRA in California), you may have rights to access, delete or restrict processing of personal data, and to opt out of the “sale” or “sharing” of personal information for targeted advertising. Advertising choices are handled through the consent controls above. For requests about contact-form information or anything else, use the contact form.
Children
This site is intended for a general audience and is not directed to children under 13. Children should not submit the contact form without permission from a parent or guardian.
Changes
We may update this policy from time to time. The date at the top of the page shows the most recent revision. Questions can be sent from the contact page.