What is the best free private web browser for the iPhone 4S?

I need an app that is a web browser, like safari or chrome but is hidden away as another app like a calculator that's free. Do you know any apps like that? Apps that look like a calculator or any other thing when on the home screen but when you access it it still looks likes regular app until you put a secret password. And it has to be free.

I found one that's paid: it's called Bcalculator. I need one that does exactly what that app does but it has to be free.

You should search in the app store for ways to protect your privacy or hide your browsing. You can then find great apps to hide what you are doing.