Visidon AppLock is a free face recognition app for Android phone, which can be used to protect your phone from unauthorized access. You can protect any application such as SMS, Gallery, Email, Contacts, Facebook, etc using your face as a key.
If your phone has a front facing camera, you can use this app to protect your private apps with face recognition. It verify your face in real-time and very easy to use.
If your phone has no front facing camera, still you can use this app to protect you private apps with passwords. It will enable password verification, if your phone has no front facing camera.