Augmented Reality (AR) flashcards have emerged as an important educational resource for language learning. However, there is limited research on its application in early childhood education. This article aims to explore the technology’s value in early childhood education by comparing it with traditional paper flashcards. To that end, a study was conducted in which 98 children, aged between 5 and 6 years, and four teachers, all from a Macau kindergarten, took part. One group of children had animal-related vocabulary using AR flashcards, while another group used traditional flashcards. To measure the effectiveness of the two approaches, the children underwent pre- and posttests on their vocabulary and the teachers were interviewed. For the data analysis, paired-sample t tests and independent-sample t tests were utilized, and the level of effect was measured. The results showed that both AR and traditional flashcards could significantly improve children’s vocabulary learning and that there was no significant difference in effectiveness between the AR and traditional flashcard methods. The teachers indicated that the children enjoyed the AR learning activities, but that there were certain challenges associated with using AR flashcards in a kindergarten setting.