This app works only with Smart Launcher. This app uses the Device Administrator permission, in order to use a restricted API that allows to turn off your device screen. This plugin will enable Smart Launcher to use some extra features. Actually you need this plugin to turn off the screen with a double tap using Smart Launcher.
You can download the .apk setup package of SL Screen Off plugin 3.0 for free and take a look at users' reviews on Droid Informer. This file size doesn't exceed 14 KB and the app can be launched flawlessly on Android 2.3 and higher. The antivirus report indicates that this application is completely safe. Smart Launcher Team is the developer of the tool which refers to the Libraries & Demo category.
The latest release was on Aug 20, 2017 and SL Screen Off plugin was downloaded and set up by over 1M users. The average score for the app is 4 on Google Play. Samsung and LG users highly appreciate this application.
Users write reviews pointing out that the major plus of the tool is many cool features.