Use the best calculator data vault to hide data and personal expenses, It’s a daily expense management data entry app. Calculator Data Vault is the Vault app that can secretly Hide data and personal expense without anyone knowing as data lock installed in your phone looks as just a beautiful calculator, and works very well. Your files will be secretly stored in vault and can only be viewed after a Numeric PIN is entered on calculator panel of this app. It disguises itself as a Calculator to make it impossible for prying eyes and hackers from discovering it. It is the most feature-rich app in the market in Security Category.