No tracking.
These tools run entirely in your browser.
No observers
There is no Google Tag Manager (GTM), analytics, tracking, advertising, account system, or backend collecting your calculator data.
Local means local
Your inputs and calculations stay in browser memory. When a tool saves a preference or you enable autosave, it uses your browser’s localStorage. Exports leave the browser only when you choose what to do with the downloaded file.
Shared URLs
When a tool supports a shareable URL, it should put the encoded data after # rather than ? whenever possible. A URL fragment is not sent to the server in an HTTP request; your browser reads it locally.
A URL can still be shared
Anyone you give a shared URL to can read the information encoded in it. Treat a shared URL as data, and share it only with people you intend to receive it.