App Lock - Lock & Unlock Apps

How to lock (and prevent access to) individual apps on Android

Samsung's 'Good Lock' app debuts on Google Play Store

App Lock - Lock Apps Password

App Lock - Photos, Video, File & App Vault

4 Quick Ways to Lock or Hide an App on an iPhone or iPad

App lock - Fingerprint password

How to Lock Any App on Your iPhone

10 Free App Locks for Android - Privacy Protection for individual Apps