Guinness says:

Guinness 0 boasts a beautifully smooth taste, perfectly balanced flavor, and unique dark color, similar to Guinness Draught, brewed to be non-alcoholic. The resulting product is a non-alcoholic stout that is unmistakably Guinness, inspired by the same dark, ruby red liquid and creamy head, hints of chocolate and coffee, smoothly balanced with bitter, sweet and roasted notes.