PRIVACY
The arithmetic stays in this browser.
Binspan does not upload a waveform or send calculator inputs to a processing service.
Inputs and local results
No account or signal file is required. This release does not store an input history in cookies, local storage or session storage. Reloading opens the default example. Inputs have no form names and remain disabled until the calculator starts, so a no-JavaScript form submission cannot put them into a URL query.
Save text and Save JSON create a local file from the current valid result. These files include exact fractions and assumptions. They are not uploaded by the site.
Copy notes
The clipboard API is called only when you press Copy notes. Your browser can deny the action; a selectable text field then appears. A write already given to the browser cannot be cancelled by editing inputs. The app suppresses completion messages and fallback text from an older result.
Hosting and external services
The host may process ordinary web requests, IP addresses and technical information for delivery and protection. This calculator source contains no active advertising, analytics or consent-platform script. Publisher metadata and ads.txt prepare possible future advertising; they do not switch ads on. This notice must change if tracking is enabled.
Reference links go to external sites with their own practices. Contact email is handled by email and forwarding providers. Do not email passwords, private recordings or information unrelated to a correction.