KillApps Overview
KillApps lets you close apps running in background automatically by a simple touch. You can choose to close all apps at once, or you can select specific apps to close.

Features of KillApps
Close running apps
Close background tasks and services
Supports user apps and system apps.
Widget
This app does not collect any data.
This app uses the accessibility service.
This app requires the accessibility service permission in order to be able to close other apps.
This app will be able to retrieve the active window content in order to find the button which forces closing an app in the system settings, then emulate a click action.
This app will be able to observe the actions related to the interface in order to guide the process of automating the task of closing apps , by monitoring the transition between windows during the emulation of interaction with the interface.

VirusTotal Results:
APK:
https://www.virustotal.com/gui/file/21952967390c05b1ea94ca867a01a4a77ea82c8ba6bd4e52fddb8e0fbac37347/detection