Mockups are representations of designs or concepts, created to give an idea of how the final product will look. Antonyms for mockups could be reality, actuality, or truth. If you are looking for a term that is more design-specific, then antonyms could be completed, finished, or finalized. These words suggest that the design is no longer in the development stage and ready to be released to the public or used in a final product. Other antonyms for mockups could include genuine, authentic, or legitimate, implying a sense of legitimacy or truthfulness. Ultimately, the antonyms for mockups focus on the finished, polished, and truthful aspects of designs or products that are ready to be launched.