Privacy policy
This page explains what data RiverMath processes, why, and how you stay in control.
Site operator
RiverMath is operated by [operator — TODO]. Registration and contact details are displayed here when configured.
In-browser calculations
Every calculator formula runs locally in your browser after the page loads. Calculation parameters are reflected in the page URL to let you restore or share them — anyone receiving the link can read those inputs. No user account or personal profile is required.
Local history on your device
Recent results (up to 250 entries) can be saved in your browser’s localStorage so you can return to them later. Clicking “Clear local history” or removing an individual entry deletes those records strictly from your browser and does not remove any copies previously sent to the server.
Optional server copy
Server synchronization is off by default. When manually enabled, only new results from permitted calculators are sent to the server: calculator identifier, text result lines (which may contain calculation figures), fingerprint, browser identifier, and language. URL query parameters, custom names, and pins are not sent. Earlier local history is not uploaded. Read access is restricted solely to the site administrator via PIN. Turning sync off stops future uploads and does not delete previously synced copies. Clearing local history removes entries only from this browser. The public interface does not offer deletion of individual server records — an administrator can only clear the entire server log at once.
Calculators excluded from server sync
BMI, body fat, waist-to-hip ratio, FFMI, calories, ovulation, pregnancy, alcohol units and the breathalyzer never send results to the server, even when global sync is enabled.
Cookies and analytics
Necessary storage remembers your theme and privacy choices. Google Analytics 4 (G-SVM68TGM9C) loads only after explicit opt-in consent. See the Cookie policy for details.
Your GDPR rights
People in the EEA and UK have rights concerning personal data, including access, correction and deletion, and the right to complain to a supervisory authority. The operator must provide contact details and a process for requests concerning server copies.
Contact
[contact — TODO]