Design thinking naturally fits in an approach to computing education that is based on constructionism. Constructionism posits that learning is enhanced when learners actively create artefacts using computing technology. This paper focuses on “smart things” like smart watches. It explored three main toolkits, used for designing smart things (e.g., smart watches) in computing education setting. This paper compares these toolkits based on how they support the different stages of design thinking. Through this analysis, the paper aims to draw valuable lessons for the future of smart-thing design education, preparing learners to become effective citizens in a technology-driven world and critically reflect on it.