You Do Need power plug adapter while traveling from Saint Kitts and Nevis to Cape Verde.

Here is Why You Need An Adapter

The outlet and plug type used in Cape Verde are C and F and in Saint Kitts and Nevis are D and G. This is how they look like.

Saint Kitts and Nevis

In Saint Kitts and Nevis, outlets of type D and G are in use.

Type D

Type G

Cape Verde

In Cape Verde, outlets of type C and F are in use.

Type C

Type F