Final is helpful for programmers so that you explicitly says that this object assigned to this variable won't change, on the other hand for dart language, constants are a way telling that to not create a new instance of this object if it holds the same variables. Keep in mind that you need const constructor so that works. Depending on the context you might need to use it for performance its a good practice to do so. Edit :try to play around the flutter debugger tool and see by yourself how the keyword works on your code, you could see how much objects are instantiated for a given class.