The best free alternative to ApowerMirror is scrcpy, which is also Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to ApowerMirror and 12 is free so hopefully you can find a suitable replacement. Other interesting free alternatives to ApowerMirror are Samsung DeX, LetsView, MiracleCast and TeamViewer QuickSupport.
Samsung DeX ("Desktop eXperience") is an accessory sold first with Samsung Galaxy S8 and S8+ devices that extends the functionality to allow desktop-like functionality by connecting a keyboard, mouse, and monitor.
Samsung DeX vs ApowerMirror opinions
pros, cons and recent comments
ApowerMirror mirrors phone's screen, DeX turns the phone in a desktop computer
LetsView is a free screen mirroring app that allows users to mirror Android and iPhone to the computer conveniently. It supports a variety of mirroring protocols. You can also stream the phone screen with audio with one click.
The MiracleCast project provides software to connect external monitors to your system via Wi-Fi. It is compatible to the Wifi-Display specification also known as Miracast. MiracleCast implements the Display-Source as well as Display-Sink side.