Calculator Lock is a secure vault app designed for iPhone users. With this app, you can hide photos and videos under a secret vault protected by a calculator lock. It functions as a photo lock and video lock, allowing you to lock and hide your files like a gallery vault.

One of the key features of Calculator Lock is the ability to store photos in a photo vault that can only be accessed through the app. These hidden photos will not be shown in any other vault app, photo album, gallery vault, or file manager. The app also includes an inbuilt image viewer for easy management, deletion, unhiding, and movement of pictures in the gallery vault.

In addition to photo and video lock capabilities, Calculator Lock provides other useful functions such as a vault app and the ability to create and hide contacts. It also includes a password manager feature that allows you to store all your passwords in encrypted formats.

Calculator Lock offers a disguise mode feature, which allows you to change the app's icon or logo to something less conspicuous, providing an extra layer of privacy and security. The app also includes a snap intruder feature that captures selfie photos of anyone attempting to break into your secret vault with the wrong password.

To open the app, simply enter your password on the calculator and press the '=' button. In case you forget your password, there is a master reset option available by entering "=" and verifying your security question.

It is important to note that Calculator Lock does not copy or store your photos, videos, audio, contacts, notes, passwords, etc. However, it is recommended not to uninstall the app, clear app data, or delete files and folders generated by Calculator Lock to avoid permanent loss of your files.