Google Software Engineers have made improvements to the operating system over time to the point I believe the necessity and usefulness of these utilities is questionable especially if you are on Android 7 or later. Many people post their experiences with these apps without acknowledging their operating system version which could be significantly different than many other users. This article on Adroid Pit (you can Google it) recommends you get rid of these types of apps. https://www.androidpit.com/android-apps-you-should-remove-immediately But there are lots of other articles, forum posts, article comments (mostly older) that swear by these apps. Maybe out of the dozens of functions in these apps there's one or two useful ones on Android 7 (although my LG G6 already comes with a Smart Cleaner app) Has anyone done any serious testing to see if each function makes a difference and can rule out other causes for seeing an improvement in phone performance? Or are most people's experience based on a "guftfeel?" Are the majority of Android 7 users using these apps basically blindly using them because they feel good to use and aren't actually getting the significant benefit they think they are getting? Could many of them, especially the ones that may "try to do too much" actually be hampering your Android 7+ phone more than helping it?