Cats can indeed have apples, as long as you remove the apple seeds.
Apples can actually be a healthy snack for your cat. Most cats will love the taste of apples, but don’t be shocked if your cat doesn’t want to eat them, because some cats just wont like the taste.
If you are giving your cat apple, you should also peel it, or wash it very well. Although the pesticides used on apples are not harmful to humans, since cats are much smaller, they can potentially be harmful.
Some cats can also have an allergy to apples. If it is the first time you are giving your cat some apples as cat food, you should watch them carefully. Start by giving a vary small slice of the apple. If thy like it, watch them for a couple minutes, and make sure they do not start acting strangely. If they are ok, feel free to give them some more.
Like all other foods, apples should be given to cats in moderation. Too much apple can cause an upset stomach.