HEXelon MAX is a powerful scientific calculator designed to help us perform all sorts of mathematical calculations. This tool supports not only basic arithmetic operations but also advanced functions such as trigonometric, hyperbolic, logarithmic, and logical functions, with the possibility to add our own functions. Furthermore, this calculator can also be used to convert among thirty-five currencies. The exchange rates update automatically from the European Central Bank (or the National Bank of Poland) on a daily basis. This utility also supports the conversion of power/area/speed/quantity/length/pressure/mass/volume/energy/angle units, etc. We can set the numeral system, and the measure of angles, and perform three operations at a time. The layout of the calculator's virtual keyboard can be changed to our preferences. This application also enables us to post our operation on the Internet, and to receive feedback. The user interface has a rather professional appearance and it resembles that of a handheld calculator. This program also lets us switch the language of the user interface from English into Polish or Czech. It is also possible to download and add any (or all) of these language extensions: French, Russian, and Slovak. This calculator is one of the best (if not the best) free scientific calculator that I have ever encountered.