The app is completely safe for downloading. Educational Publishing House, Limited is the official developer of 算柱 which can be found in the Educational category. According to the latest info, the tool is rated 4.2 on Google Play.
This application has been downloaded and installed by over 1K users and its latest update was released on Apr 14, 2014. Download the setup package of 算柱 1.0 that is absolutely free and take a look at users' reviews on Droid Informer. The app can be launched flawlessly on Android 2.2 and higher.