Secret Vault Hide Photos is a standard calculator, which includes hidden file manager. Calculator becomes a secret vault and a file manager where you can store your private data. It is not visible from the other applications like gallery or file managers and only visible from this application.
Use the instructions and follow the secret steps to set your password the first time and then use the numbers on calculator to unlock the hidden folders.
If you forget or lose your password for some reason there is again no need to worry. You can set a backup email from the application and you will be mailed a newly generated password so you can unlock your hidden data.
Secret Calculator is very simple to use and very effective at hiding your secret data from undesired exposing.