The ratio that works best for my recipes is for every teaspoon of paprika, I use one-fourth or one-third teaspoon of cayenne chili powder, depending on how spicy or hot I want the dish to be.
Apart from different varieties of peppers, such as black, white, and cayenne pepper, cajun spice contains other spices and herbs. They can include onion powder, garlic powder, salt, thyme, rosemary, and oregano.