You Do Need power plug adapter while traveling from Cape Verde to Cayman Islands.

Here is Why You Need An Adapter

The outlet and plug type used in Cayman Islands are A and B and in Cape Verde are C and F. This is how they look like.

Cape Verde

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

Type C

Type F

Cayman Islands

In Cayman Islands, outlets of type A and B are in use.

Type A

Type B