This FREE app will let you be in control of your data usage to avoid the costly overage charges your provider may charge providing alerts when data usage reaches user thresholds.

Data Monitor manages data usage from the device itself and is not reliant on setting up or logging into your providers server or web site.

Features include: - Simple and clear user interface with custom progress bar that graphically shows your data usage and predicted usage.

Works with ANY cellular provider in any country including ATT, Verizon, Sprint, T-Mobile, Rodgers, Virgin Mobile, etc.

Advanced Features: - Custom counters can be setup allow you to monitor usage during a certain period to help identify data hogging apps.

Counters can be easily enabled or disabled and can even be configured to end at a predetermined time.

History graph shows previous data usage for each day.

Email your usage information at any time.

Data Monitor is a must have app for anybody on a restrictive data plan and is available for FREE Dont pay those expensive overage charges again.

This however, does reset each time you restart your computer.

For something more in depth check the MacApp Store and use the search term network monitor.

Not sure if there is any app that can actually controllimit internet use on a per app basis.

If yours isnt, change the security setting on the access point.

Make it a string of at least 8 random characters, including digits and upper- and lower-case letters.

Manage Internet Data Use Password Is Saved

The password is saved in the keychain and you dont have to be able remember it; in fact, you shouldnt be able to remember it.

You make these changes in AirPort Utility, if the access point is an Apple device, or in a web browser otherwise.

If the network or the password was insecure, and bandwidth use returns to normal after securing it, you can be pretty sure the problem was caused by intruders.

Most often BitTorrent, iCloud or some other cloud-data application is involved in cases of mysterious bandwidth use by a Mac.

If you use iCloud, uncheck at least Photo Stream and Documents Data in its preference pane and see whether theres any change.

If you use third-party network backup software, disable that.

Otherwise, theres no easy way to monitor network usage per process using built-in tools.

If youre an advanced user and you want to try, see the manual page for the nettop(1) shell command.

Manage Internet Data Use Install Either One

I suggest you uninstall either one when the question has been answered.

Whilst it doesnt break down usage by application, it can monitor your Internet router and other compatible devices (PCs, Macs, servers etc) and display their bandwidth use in real-time in your menu bar.

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How To Manage Internet Data Use For Mac