Local processing, by design
Files, pasted rows, quantities, prices, project names and results are processed in your browser. There is no upload endpoint for worksheets. Matching runs against a public item index locally. A Web Worker parses files and calculates results; it does not send your rows to a service.
The site still makes public data requests
The browser loads the site, local fonts and scripts, a public item index and selected public price-history files. Cloudflare delivers the site in front of the hosting server. The hosting provider and Cloudflare may receive your IP address and the public page or data URLs you request, including a selected state and public item ID. Those requests do not include your worksheet fields or filenames. The tool needs an initial connection to load the relevant public data. Offline availability is not guaranteed.
Saving is your choice
Save on this device writes a project to this browser’s IndexedDB only after you choose it. The local project list has a delete action. Clearing browser data can remove saved projects; another browser or device cannot see them. Export JSON for a portable copy, and keep that file where you normally protect project information.
No third-party tracking
This release has no third-party analytics, session replay, external fonts or remote error tracking. User fields are not written into URLs or fragments. The site does not need a login or collect an email address to use its tools.
Imports are treated as data
The tool does not execute spreadsheet macros, formulas or imported HTML. Cached formula values can be read with a warning; a formula without a cached value needs correction. Technical limits protect the browser: 20 MB compressed files, 50 MB unpacked spreadsheets, 10,000 rows, 100 columns and 300,000 cells. You can cancel processing and retry.
Exports and data issue reports
CSV output protects formula-like text before a spreadsheet opens it. JSON exports include your project, filters and dataset version. Printing uses your browser’s print dialog. Copy data issue details includes only the public record identity and version; it does not automatically include your worksheet. If you choose to email the site administration, your message is sent through your email provider to the published contact address. No worksheet is attached automatically.