Android app to show what apps/processes are currently using data

Question

What Android app shows, in real-time, what apps and processes are currently transmitting and receiving data?

I am interested in quantity of data being transmitted (not speed).

Recommendations for paid apps are fine, but gratis is preferred.

Apps requiring root are acceptable, but please specify if it requires root privileges in your answer.

Note that Android's integrated data manager sort of does this, but it is really only effective for cumulative data over multiple days. It doesn't work well for real-time information.

Answer 1

Since there was no answer posted yet, I decided to include it anyway.

Currently the best option of achieving that is using Network Connections as Izzy rightly suggested (and I happen to use the same application as well).

This app is user friendly can be installed on non-rooted devices as well.

After you launch the app, the first thing you will see is the Current Connection tab. This tab tells you the connections that are currently active on your mobile and the apps that are connected to the internet. It also shows the amount of data packets being transferred in real time.

Key Features:

• Monitors all internet connections from and to your Android device
• Displays notification when hidden apps are connecting to remote servers
• Displays detailed IP information for each connection - IP address, reverse resolving (PTR), AS number, Abuse RBL data, administrative information, etc.
• Gets detailed info about each app that connects to remote servers and network connections used by it - permissions granted to each captured package and all IP addresses used by it.
• Real-time sort by most active, latest connections or by package name.
• Log and export the captured data.

Answer 2

You can also use Bytes Insight by Oasis Feng.

Bytes Insight is a very lightweight application about 127kB and uses very little memory in background.

Bytes Insight calculates in real-time, what apps and processes are currently transmitting and receiving data. In other words shows exactly how many kilobytes are uploaded/downloaded by given processes.

Additionally you can use the Traffic Sensitivity option to fine tune the accuracy at which it measures the data being transmitted. The default setting counts per 10KB:

^{Credits: Track data usage live with Byte Insights (and images)}