Our Review:

Convert comes with a user-friendly and intuitive interface. It offers pre-defined 21 categories of units and one custom unit which can be defined by users.

The 21 categories include the most popular units of distance, area, volume, volume-dry, mass, density, temperature, time, speed, power, pressure, energy and many others.

To convert a unit into another, just click on a category tab you need, select the input unit and output unit, Convert will show you the conversion result in the output box as you type.

The category tab is customizable. For some conversions that you use the most, you can set them to the front of the tab order, and for some conversions that you may never use, you can hide them to simplify the unit listings. A restart of Convert will bring you to the last conversion you entered.