But what exactly is the Katmovie HD app? Is it safe? Is it legal? And most importantly, are there better, legitimate alternatives?

It is likely that within the next 2-3 years, accessing apps like Katmovie will become significantly harder as DNS blocking becomes universal.

from various third-party hosting sites. Since it is not hosted on the official Google Play Store due to copyright policies, you must enable "Install from Unknown Sources" in your device settings to complete the installation. For PC and Mac

Katmovie operates by distributing copyrighted content without a license. Depending on where you live (USA, UK, India, UAE), accessing or downloading from such platforms can lead to: