Hi,
Kinetis SDK is software development kit, you need install separate Kinetis SDK package for KDS using it.
Processor expert is integrated to KDS. users needn't install external package for it.
Kinetis SDK is newer than processor expert. both of them provide method(for example, provide sets of driver routines or method) to help user develop their own SW easier.
for the users who never use those tools before, they need take some time to learn how to use them.
sure, user can also choose develop their project without using SDK or processor expert, thus please refer Alice's answer as above .
Have a great day,
Jennie Zhang
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