calc.pw is currently in the process of being completely reimplemented. The new version will be based on the Raspberry Pi Pico with its RP2040 microcontroller. The current state of the reimplementation is documented in the calcpw.docs Github project, including a description of the new encryption. Furthermore, the calcpw.php Github project provides a PHP-based reference implementation of the new encryption.
Until then the previous content of this website is still available here.
So stay tuned...
calc.pw does not process personal data and does not include tracking of any kind. All other data that you enter into calc.pw are only processed locally and are neither forwarded to the developer nor to other third parties. The entered data are only used to calculate your passwords.