Are there any restrictions?

Apps should not include content that is offensive, insensitive, upsetting, intended to disgust, or in exceptionally poor taste.

As Apple puts it in their Review Guidelines: "Apps should not include content that is offensive, insensitive, upsetting, intended to disgust, or in exceptionally poor taste."

If we deem your app to have objectionable content or themes, we reserve the right to reject your app and refuse submission to the app stores.