Unlock your phone and apps with your face and voice using AppLock Face/Voice Recognition.
AppLock Face/Voice Recognition is an interesting app that lets you use your face and voice to unlock your phone and access locked apps. You can decide which apps to lock and unlock using this method, and there's even a nifty "liveness" feature that requires you to move your face to protect against people tricking the system with photos.
Keep your Android phone virus-free with Avast Mobile Security and Antivirus.
Sometimes malicious apps make their way into the Google Play app store, and this comprehensive antivirus app will keep you protected. It scans for and removes viruses, includes anti-theft tracking, lets you lock specific apps with a PIN, and even lets you remotely snap a picture and record audio if anyone steals your phone.