The latest update of the tool was released on Sep 16, 2019 and BLK was downloaded by over 0,5M users. In-app purchase items and ads can be found in this application. Download the .apk installation package of BLK 1.7.0 that is absolutely free and have a look at users' reviews on Droid Informer. This application setup package requires 36 MB to be successfully installed. The app is compatible with Android 5.0 and above.
According to the users’ feedback, there are some drawbacks, they are spelling errors and intrusive ads.