Over 10M users downloaded and set up LocalCast for Chromecast/Roku/Apple TV/Fire TV and its latest release was on Jun 12, 2019. Pay attention to the important detail: ads are a part of the tool and it offers in-app purchases. Samsung and LG users like this application.
Get the .apk file of LocalCast for Chromecast/Roku/Apple TV/Fire TV 188.8.131.52-RC1 free of charge and have a look at users' reviews on Droid Informer. You will need 10 MB to set up the app which is built for Android 5.0 and above.
From the users' point of view, the app features the following pluses: a good UI, simple functionality, superior performance, quite a few bugs, constant updates and excellent support. The way users see it, there are some drawbacks, they are full-screen ads, buggy freezes and a battery drain.