What this site does and doesn't collect
No publication sign-in; separate browser-record handling and hosting-request limits.
The publication has no sign-in or broker connection. Its own browser scripts calculate and export user-entered records without transmitting those entries or saving them to browser storage. Hosting still receives page and asset requests. The publisher has not supplied an authoritative hosting-log, retention or third-party processing register; no blanket no-collection assurance is made.
External providers and regulators handle their own visits under their own policies. Search terms may enter the page URL and be visible to hosting infrastructure. An operational correction or security contact has not been confirmed here. Do not send private account records to a guessed address; exports should stay under the reader's control.
Browser records and downloadable files
The free arithmetic tools keep entered assumptions in the current page. The subscription workbench can import a file chosen by the reader and export that record; its script does not upload the file or persist the entries to browser storage. Reload or reset clears the page state, not a downloaded file. Keep exported account-related notes in a location controlled by the reader.
Search uses the publication's static index. A query can be added to the browser URL, so it is not a confidential storage channel and should not contain credentials or private account references. The page scripts do not connect a broker, subscribe to a room or submit a trade. Hosting requests are a separate processing boundary.
What has not been confirmed by the publisher
An authoritative retention schedule, accountable legal entity and full hosting/third-party processing register have not been supplied. This edition therefore does not promise no server logs, no cookies from every infrastructure component or a particular deletion period. A current operational contact also remains unconfirmed; an inferred editor address is not advertised.
External sites receive their own visits under their own policies. Exporting a worksheet does not certify the imported notes or make them private once shared. Avoid importing credentials or unnecessary personal information, and do not treat this static publication as an account-management or confidential evidence-submission service.