Privacy note

Short version: these tools run in your browser. I don't get your numbers, your CSV or an email address.

No upload. Calculator inputs and CSV files are processed by JavaScript on your device. Closing the tab clears them.
No network requests carrying your data. Each tool page sets a Content-Security-Policy of connect-src 'none', which blocks fetch, XHR and similar from that page. Sample CSVs for the previewer are built into the page, so even those don't need a download.
No accounts, no email gate, no paywall. Both tools are free to use fully.
No third-party analytics on these pages. If that ever changes, it will be named here first.
Outbound links. Links to Contra, Etsy or other sites (when present) leave this host. Their privacy policies apply there. Product links may include UTM tags so I can see which free tool a sale came from; those tags don't contain your data.
Hosting. The static files are served by Cloudflare Pages. Cloudflare's network may see the usual connection metadata for any website (IP address, user agent, pages requested). I don't run a separate tracker on top of that.

Questions: contact Chris Elder via his Contra profile.