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• Only minor changes, if any, are required to use CplxCalPro scripts with PDAcalc classic
• Only minor changes, if any, are required to use MtrxCal scripts with PDAcalc matrix
• Scripts written for MtrxCal or PDAcalc matrix are not compatible with CplxCalPro or PDAcalc classic

• If you only want to use a calculator for some basic calculations on your palm device CplxCal might be the right choice for you. However keep in mind that CplxCal is just a basic calculator that supports complex number and small user programs but is limited.

• If you like to graph functions, write advanced user program on you palm and don't use a windows platform or a PocketPC CplxCalPro might be the right choice for you. CplxCalPro was designed for a palm device only.

• If you like to use units in your calculations PDAcalc units is the right choice for you. This calculator is far more powerful than the conversion programs you might be thinking of. PDAcalc units will automatically convert the units for you. For example 110V * 16A will automatically be converted to 1760W. Multiplying 45in * 2m will automatically be converted to an area unit.

• If you like to use matrices or like to learn how to use them and don't use a windows platform MtrxCal might be the right choice for you. . MtrxCal was designed for a palm device only. When you learn how to use matrices you will notice how easy it is to perform far more complicated calculations with only a fraction of the commands needed with a none matrix calculator. 

• If you like to use the same calculator, and same user programs, on your palm and windows platform or a PocketPC and windows platform one or more PDAcalc modules is the right choice for you. Using PDAcalc you can write and test your script/user programs on a windows platform using a 'normal' keyboard and synchronize your scripts with your palm device or PocketPC.

• If you are familiar with the high end mathematical programs like SciLab, Octave, Matlab etc. PDAcalc matrix is the right choice for you. PDAcalc matrix allows you to perform advanced matrix calculations including eigenvalues, decompisitions - Singular Value - QR - LU,  Cholesky factorization etc. PDAcalc matrix takes calculations on a PDA far beyond what you thought possible.