It won't replace a proper flashlight, but brings some Halloween fun in a phone-sized package.
Apple has its own flashlight component for iOS devices running iOS 7 or later: just swipe up from the bottom of the screen to launch Control Center to find it.
Unfortunately, this addition rendered the myriad number of third-party flashlight apps obsolete, but some still offer more oomph than Apple's stock offering.
Consider Flashlight Strobe (free). It offers several different types of light patterns, such as a fluttering disco light, a flashing strobe, or a video player mode that sets the light to music.
You also can just use it like a regular flashlight, lighting up your path with torch mode. The app is free, with a $1 option to remove ads.
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