Calculator Vault is a privacy protection app that allows users to hide photos, videos, audios, and files. It ensures the safety of users' data by not collecting or sending any private information. Even when the network is disconnected, the app can still be used normally. In the case of online synchronization, data is directly synchronized to the user's Google cloud disk and hidden, eliminating any data security concerns.

One of the key features of Calculator Vault is its disguise function. The entire application is designed to look like a regular calculator, making it difficult for others to discover the hidden space beneath the calculator interface. This clever disguise ensures that users can keep their private files and data hidden from prying eyes.

In the event that a user forgets their password and security questions, Calculator Vault provides options for recovery. If the disguise function is disabled, after multiple incorrect password attempts, a change password icon will appear on the verification page. Clicking on this icon will lead the user to the help page for further assistance. If the disguise function is enabled, a long press on the "=" button will allow the user to enter the password modification page. From there, they can click on the help icon to access the help page for guidance on password recovery.