Any realtime network traffic monitor app?

Is there any traffic monitoring apk in realtime? I found my mobile was frequently downloading or uploading something even when I didn't open any app. So I want to know which apps are downloading and/or uploading at that time. Can anyone suggest me an app or widget (more preferable) which can monitor realtime traffic?

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Module/app to redirect specific app traffic

Hi,

I am all new with Xposed and modules so I may have missed the appropriate module for my issue.

I would like to redirect all internet traffic from a specific app to another domain/IP. :confused:

To explain it more clearly, I want to redirect the Fitbit app traffic to my personal raspberry pi and build my own dashboard instead of sending data to Fitbit servers. ;)
Otherwise, is there any cool module or app to track all requests from a specific app so I can redirect these by using hosts file.

For now I have simply removed the network permission to the Fitbit app by using the Xprivacy module which is working perfectly.

Thanks for your feedback.