NetLive allows you to monitor your internet data transfer rate while displaying which app is currently using the most data. NetLive runs in the notification drawer or as a widget, giving you uninterrupted access to your transfer rate information.
NOTE: NetLive does not log app data usage or transfer rate speed beyond the defined poll rate (between 1 and 10 seconds). It is meant to show you "Live" information, not information about the past day or week. Many users are confused by this and I want to make this as clear as possible.
Features:
• Monitor your WiFi or carrier transfer rate speed
• Notification icon changes whether you are uploading and/or downloading data
• Always know which app is currently transferring data (it will surprise you what is running in the background)

• Use the size and color customizable widget to view transfer rate information on your home screen
• Open source
Known Issues:
NetLive seems to use significantly more battery on Android version 4.4.2 (KitKat) than on previous versions. I will not be updating NetLive in the forseeable future. If you feel you can make it better, I encourage you to fork it on github here: https://github.com/octohub/NetLive
If NetLive is consuming more battery than you desire:
• Disable the active app feature (this will significantly decrease battery usage)
• Increase the poll rate (this will help marginally)



• Hide the notification icon (this will help marginally)

المصدر
http://www.bintfuj.net/article/details-329.html