On Google Play, this application is rated 4.4 by its users. Take into account the important moment: advertisements are a part of the app and it offers in-app purchases. Use the opportunity to download the .apk installation package of Calc Box 3.0 free of charge and have a look at users' reviews on Droid Informer. The installation package occupies 3 MB on disk and it runs on Android devices 4.1 and above.
As users indicate, there are some benefits, they are a nice layout, good performance and many cool features. Users leave reviews pointing out that you can notice such drawbacks of the app as ads everywhere and false notifications.