TripMode

If you usually connect to the Internet via a mobile network or you have a limited quota, then there is a good chance that you received a high bill from your ISP at least once.
TripMode is a light application that enables you to monitor the traffic of all the programs, updates and processes on your computer, so you can block the ones that are eating up too much of your bandwidth.

Sleek, modern and user-friendly interface

The setup is fast, smooth and does not require any special attention or configuration on your part. The utility comes with a minimalistic UI that consists of a small window and that can be accessed from the System Tray.
Despite the size, let us not forget that the role of the tool is to identify all types of processes that are using your bandwidth. Considering that this process should be interfering with your usual activities, the interface is appropriate for a program in this category.
On a side note, the application could use more options that enable you to block access automatically to processes between at certain intervals. The aforementioned function could come in handy when you want to make a significant update to your operating system or other system utilities, for instance.

Enables you to control Internet traffic seamlessly

Upon launch, you can preview a list of the applications and processes that are connected via your network and that require Internet access. As you probably already hinted, the programs marked with blue are actively using the Internet, whereas the ones in gray are blocked.
It is necessary to mention that you can block access or activate any of them with a simple mouse click. This feature can surely come in handy when you are away from home and have limited access to the Internet or a reduced quota.

A simple, yet powerful utility to monitor and control your bandwidth usage

All in all, TripMode does an excellent job of monitoring the traffic on your computer and blocking access to updates that could make your Internet bill skyrocket.