Calculator Photo Vault is just a normal iPhone calculator, until you type in your password and press equals. After having put in your Touch-ID, a whole new world opens.
Photos: Store all of your photos that you dont want people to see in here.
Notes: Put private information that you dont want visible in Apples Notes here.
Browser: An in-app private browser, no history is kept for any period of time.
Your data is totally secure from your friends, family, and enemies. Your password and touch-ID are required every time you re-enter the app. None of your data is ever saved on any servers, it never leaves your phone.