This app is using for converting amounts from Kilogram to Carat as well as converting amounts from Carat to Kilogram.

First of all, let us talk about kilogram type and Carat type:

Kilogram (kg):

The SI unit of mass, equivalent to the international standard kept at Sèvres near Paris (approximately 2.205 lb).
The kilogram or kilogramme is the base unit of mass in the International System of Units. Until 20 May 2019, it remains defined by a platinum alloy cylinder, the International Prototype Kilogram, manufactured in 1889, and carefully stored in Saint-Cloud, a suburb of Paris.


Carat (ct):

The carat (ct) is a unit of mass equal to 200 mg (0.2 g; 0.007055 oz) and is used for measuring gemstones and pearls.
The current definition, sometimes known as the metric carat, was adopted in 1907 at the Fourth General Conference on Weights and Measures, and soon afterwards in many countries around the world.[i]
The carat is divisible into one hundred points of two milligrams each.
Other subdivisions, and slightly different mass values, have been used in the past in different locations.
In terms of diamonds, a paragon is a flawless stone of at least 100 carats (20 g).


By the way, As far as I told, this application is useful for converting amounts from Carat to Kilogram or converting amounts from Kilogram to Carat type.
So let's start using that.