This application has been checked for viruses and it has been found totally secure. The app was originally developed by familion.ru and it is listed among the Educational category. 1А has been rated 3.9 on Google Play.
The tool has been downloaded and installed by over 100K users and the latest update was released on Dec 19, 2014. There are in-app purchases and adverts in this application. The app is very popular among Lenovo and HTC users.
It's free to download the .apk file of 1А and you can have a look at users' reviews on Droid Informer. This application installer requires 24 MB of free space to work fine on Android 2.3 and above.