BestFit traditionally is used for fitting distributions to data in Windows. In addition, BestFit is also used in conjunction with @RISK for fitting distributions to data in spreadsheet risk analysis models. For many users this is the preferred modeling environment. However, some users have models built in a standard programming language that they wish to add distribution fitting capabilities to. The BDK can also be used with a custom Windows application that has its own user interface, variables and model calculations. The BDK allows a custom application to fit distributions to data and generate statistics on fit results.
Fitting done in applications written with the BDK will usually run faster when compared with fitting done in BestFit or in spreadsheet versions of @RISK. This is because BDK applications are compiled and do not contain the additional processing that occurs when the BestFit or @RISK interface is used