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I use my Mountain Lion MacBook Air to connect to the internet using various methods. At home, I use my wired connection, which does not have a cap. Sometimes though, I connect via my iPad, which uses LTE, and does have a bandwidth cap. At other times, I connect through 3G on my iPhone, where the bandwidth cap is even lower.

Is there a utility which would run on my computer and automatically track and record the amount of data sent. I am interested in seeing the data by connection (which WiFi network I connect to) and be aggregatable by date (so I can see for today only, month-to-date, previous month, etc). For example, I would like to be able to see how many megabytes of bandwidth I have used in March 2013 while connected to a WiFi network called "Bob's LTE" or May 1st through May 8th 2013 while connected to "Bob's iPhone".

Does such a beastie exist?

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If you are looking for simple real time statistics, checkout iStat Pro. It is a widget that provides a lot more than just network information.

Surplus Meter or Net Monitor look like they would do exactly what you want:

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They show per interface on the Mac so son't show the iffernce between the OP using the IPhone or iPad – Mark May 8 '13 at 16:42

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