One-Handed Mode by XDA-Developers is the first and only app that replicates the iOS Reachability feature without requiring root access or a custom ROM. One-Handed Mode lets you reach your status bar and action bar of any app without having to stretch your hand. It does this by moving the entire screen down to a smaller window.
XDA is the creator of this application which is listed among the Personalization category. The latest update of One-Handed Mode was launched on Nov 26, 2017 and the app was downloaded by over 100K users. Users rated this application 2.8 on Google Play.