Vault

Vault is a privacy app developed by NetQin Mobile to protect data on Android phones. This app allows users to hide things on their cellphones away from prying eyes, such as photos, videos, text and Facebook messages, contacts, and call logs.

The app is easy to use, and it alerts the user, giving photo evidence of any break in attempts. The private files are stored in the vault and are password protected. The premium version offers a stealth mode and a fake vault. The Vault is a great app for anyone who happens to be living with a nosy person.