Privacy

This site sells one book. It has no accounts, no mailing list, and no login. What follows is the complete list of what it does and does not collect.

Last updated 2026-07-30

What this site does not do

There is no sign-up form, no newsletter, and no account system anywhere on this site. It does not ask for your email address, and there is nowhere to submit one. Nothing you type into the two calculators is transmitted — both run entirely in your browser, and the numbers you enter are never sent to a server or stored.

No personal information is sold, rented, or shared with anyone for their own purposes.

Analytics

This site uses Google Analytics 4 (property G-P2PLETWKQ1) to understand which pages people read and which links they click. It sets cookies in your browser and records:

Pages viewed, and the order you viewed them in
Approximate location, derived from your IP address at country or city level — the full IP address is not retained by this site
Device type, browser, and screen size
The site or search that referred you here
Clicks on the buy links, recorded as an event naming which edition was clicked

This is aggregate traffic measurement. It is not tied to a name, an email address, or any identifier this site could use to contact you.

Advertising

This site runs Google Ads campaigns. The Google Ads tag sets cookies used to:

Attribute a purchase click back to the ad that brought you here, so campaign spend can be measured
Build remarketing audiences, which may cause you to see ads for this book on other sites in Google's network

Buying the book

The buy links send you to Amazon. Every part of the purchase — payment, address, delivery, and your order history — happens on Amazon under Amazon's own privacy policy, not this one. This site never sees your payment details, your address, or your name. It only records that a buy link was clicked.

How to opt out

Install Google's Analytics opt-out browser add-on to stop Google Analytics on every site, including this one.
Turn off personalised advertising in your Google Ad Settings.
Block or delete cookies in your browser settings. Nothing on this site requires them — every page, both calculators, and the sample chapter work with cookies fully disabled.
Enable your browser's tracking protection, or use an ad blocker. Neither is worked around here.

Your rights. Because this site holds no personal data about you, there is nothing here to access, correct, export, or delete. Requests about the analytics and advertising data Google holds go to Google, whose privacy policy governs it. If you are unsure, write to the address below and it will be explained.

Changes

If this site ever starts collecting something it does not collect today, this page will be updated and the date above will change before that collection begins.

Contact

Questions about this policy: hello@production-llm.com.