The extension sends the text of a page to Beeblio's servers to measure it, and only when you click the icon. That endpoint is stateless: it measures the text and returns the result. The text is not written to a database, not attached to an account (there is none), and not used for anything but the answer you asked for.

The extension does not run on pages you have not asked it to, has no access to your browsing history, requires no account, and sets no tracking cookies. The language you are learning and your vocabulary band are stored in your browser profile.

Full policy: https://beebl.io/privacy