AppTraffic Free is a straightforward Android application that allows users to monitor their data usage by application. The app provides detailed information on data received, transmitted, and total usage for each application. The data usage is shown since the device was last rebooted, and all values are reset to zero after a reboot.

The app has three tabs: User, System, and Stats. The User tab displays information on apps installed by the user or preinstalled apps that have been upgraded by the user. The System tab shows data usage for preinstalled system apps. The Stats tab provides a number of data usage statistics since the last reboot.

The app is free to use and is supported by ads. It is a great tool for users who want to keep track of their data usage on their Android device. If you have any suggestions, questions, or problems, please visit the project website to contact the developer.