Over 100K users downloaded and installed the tool and its most recent update was on Dec 8, 2016. There are advertisements in this application. You can download the .apk installation package of focus n filter 1.4 free of charge and take a look at users' reviews on Droid Informer. This file size doesn't exceed 9 MB and the app can be launched flawlessly on Android 3.0 and higher.
From the users' point of view, the plus of the app is a good design, however, some people suggest that the weak side of this application is too many ads.