Every "add our widget to your site" instruction has quietly become the same thing: paste this <script> , load 180 KB of framework, and let us run code in your page. For a calculator that takes four numbers and does multiplication, that is a bad trade. Here is the version we ship instead, and why each decision went the way it did. One iframe, no script <iframe src= "https://optimetricshub.com/embed/churn" title= "Churn Rate Calculator" width= "100...