Compatibility summary
You will need a travel adapter in Cayman Islands; plug types used there differ from Sweden. Voltage differs by more than 20% — a voltage converter may be needed for some appliances.
Plug comparison
Sweden plug types: C F
Cayman Islands plug types: A B
There is no common plug type between Sweden (C F) and Cayman Islands (A B). You need a travel adapter.
Voltage comparison
Sweden: 230V, 50Hz
Cayman Islands: 120V, 60Hz
Voltage converter recommended (Sweden 230V vs Cayman Islands 120V).