Privacy

The short version: epher collects nothing. There are no accounts, no analytics, no telemetry, no cookies, and no advertising. Your calculations never leave your device; there is no server to send them to.

This website

These pages are static files served by GitHub Pages. Loading them makes ordinary requests to that host, which keeps routine request logs; GitHub's own privacy statement describes what it does with them. The pages themselves store two preferences on your device; your chosen theme and language, in your browser's localStorage. They are never sent anywhere. There are no cookies and no tracking.

The web app

The web app runs entirely in your browser: every expression is evaluated on your device. So that reopening the app shows where you left off, it keeps your recent history, the current answer, and your interface preferences in your browser's storage on your device, never anywhere else. Saved functions, constants, and scripts last for the session in the browser; the installed desktop app is where they are kept permanently. The app's only network traffic is fetching its own files and the guide pages you open, from this same website. Clearing this site's data in your browser removes everything it has stored.

Desktop, command line, and terminal

The installed apps keep everything in a single folder: .epher in your home folder (%USERPROFILE%\.epher on Windows; set EPHER_STORE_DIR to place it elsewhere). Saved functions, constants, and scripts, your history, session values, and preferences all live there. These programs make no network connections of any kind. Delete the folder and every trace is gone.

Questions

If anything here is unclear or wrong, please open an issue on GitHub and it will be fixed.