One of the basic and simple flashlights that you could ever find in the Google Play Store is the Original flashlight app!

This lets you use the tool with a single click so it is very much practical whenever there are emergencies. There is no need to open the app itself before using it because you can immediately light it through its widget.

There are no other actions needed to use this tool so just access it whenever you want to. May it be during a brownout or walking at night but the lights are not enough for you to see the street.