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My laptop used up 1.4 GB from my mobile data in 30 minutes, which is quite unusual. When I opened the Network tab in Activity Monitor, the per app tracking just started, but the total Data received was at 6 GB. Is there a record of the data usage per app?

Activity Monitor Screenshot:

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I have a suspicion that this is from Chrome. If it is, is there a record of per tab/domain data transfer in Chrome?

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  • Did you ever find an answer to this? I just had 1.3gb of tethering burned and my Activity Monitor shows the usage like yours, but none of my apps show anything close to the 1.3gb used (have had the Activity Monitor open for hours now). The most is pgAdmin 155mb in, and node 24mb out, and most of the pgAdmin is local traffic only! Quite concerning. @o@
    – Guy Park
    Aug 22, 2019 at 6:05

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If you like it easy and with a Graphical User Interface and Money isn't a Point, i would recommend you to take a look at LittleSnitch https://www.obdev.at/products/littlesnitch/ mainly it is a better Firewall for OS X but you can also use it to Monitor which Application is using how much of your Traffic.

Or if Money is a Point and you can life with a Command Line Interface Application, then take a look at nettop https://www.cnet.com/news/use-nettop-command-to-check-per-application-network-activity-in-os-x/

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  • Thanks. Would you know if history of per app traffic stored somewhere in the Mac? I've already installed Little Snitch for ongoing monitoring, but I'm hoping to understand what happened in those 30 minutes with 1.4GB.
    – Kahlil Corazo
    Apr 11, 2017 at 9:11
  • i don't know any Programm witch can do this backwards - there are some tools that can go backwards but only til the time they got installed and are configured to go back to this point - you could try to have a look at the Console App maybe the Logfiles go back till the Time/Date it happend
    – konqui
    Apr 11, 2017 at 9:19
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Yes, this information would be on the line of the process you are trying to monitor. For example you are looking for the data usage of Chrome so look for Chrome on the left, and under the "Rcvd Bytes" header is the amount of data used by the application since Activity Monitor was opened.

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  • Thanks. Any way to look at history? The number only shows the number after I opened the Network tab.
    – Kahlil Corazo
    Apr 11, 2017 at 9:08
  • Unfortunately this can't be done without a Chrome extension. You could download one like DataSaver, but it would only show the usage since the extension was installed.
    – Isaac Wasserman
    Apr 11, 2017 at 10:46
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  • The (paying) app TripMode does what you want: monitor and throttle app-specific internet usage. It also allows to block specific apps from accessing the internet, in order to keep mobile data usage within limits: Tripmode screenshot

  • For global monitoring and throttling only, Bandwith+ is a free tool to monitor and throttle global aggregate internet usage: Bandwith+ screenshot

  • For blocking app-specific internet usage, the free tool Lulu can help you with that: Lulu screenshot

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