Invisible Protector Pro 2.3.0
the author of this app says:
What's the best app protector? Strong password? Of course NOT. The best proector would let prier not be aware of any protection and it also can hide itself as far as possible. Invisible Protector is one such protector to protect your private apps.
When launching a protected app, it will throw a fake crash error which may mislead guest user into thinking that your app has a glitch or something. So it can stop guest from using your protected app in a natural manner.
But owner can clear it through several secret ways. It also provide a password protector with a secret input method.
*** NOTE ***
This is a widget version of App Locker II, it will not show any app icon in the app launcher board, so it will be hard to found by guest user.
For owner, please long press the empty area of Home screen, and select the 'Z_AL II' widget from the 'Widget' menu. Then you can click the widget icon to open the App Locker and manage your portected apps. You would better remove the icon from Home screen after you finish the management.
* If you prefer the normal visible version, please try my another app 'App Locker II'.
* HK$19.30 = US$2.5