Nothing at all. Everything stays offline, and no Internet connection is ever used or needed.
The following elements are stored locally on the current device:
- Last used algorithm.
- Last used options for generation: password length, iterations, character sets, and counter.
- Whether the password should be shown in clear text or hidden.
Other informations that you input, such as master passwords, websites and usernames are not stored, and only exist in memory until the application is closed.