It helps you calculating work hours in an efficient way. You must consider time you spend at the end of your working days to keep track of what you've done. So why don't try to track directly during your activities? Start an activity when you start working and the app will handle it for you.
The app is totally safe for downloading. Onesrv is the developer of Work log time keeper which can be found in the Productivity category. The tool has been downloaded and installed by over 1K users and the most recent update is dated Jan 8, 2019.
Users rated this application 4 on Google Play. It's free to download the installer of Work log time keeper, also, you can read users' reviews on Droid Informer. The app works fine on Android 4.1 and above.