This article presents the development and validation process of MoleculAR, a digital application that utilizes Augmented Reality (AR) to assist in the teaching of chemistry. The solution allows users to interact with representations of atoms and molecules in a virtual environment. The development process incorporated elements from Participatory Design and involved chemistry teachers during the design phase. The application was validated through two testing rounds with teachers and high school students, using different evaluation instruments for each target audience. The results showed that the application was well-received by the academic community, and that the use of AR, when properly employed, is a relevant technology for assisting in the teaching of chemistry. The application is currently being registered at the National Institute of Industrial Property (INPI) and is available for download on the Google Play Store. Future plans include additional testing with high school students and the development of a new feature called "Make Your Own," which will allow students to build molecules in the AR environment.This article presents the development and validation process of MoleculAR, a digital application that utilizes Augmented Reality (AR) to assist in the teaching of chemistry. The solution allows users to interact with representations of atoms and molecules in a virtual environment. The development process incorporated elements from Participatory Design and involved chemistry teachers during the design phase. The application was validated through two testing rounds with teachers and high school students, using different evaluation instruments for each target audience. The results showed that the application was well-received by the academic community, and that the use of AR, when properly employed, is a relevant technology for assisting in the teaching of chemistry. The application is currently being registered at the National Institute of Industrial Property (INPI) and is available for download on the Google Play Store. Future plans include additional testing with high school students and the development of a new feature called "Make Your Own," which will allow students to build molecules in the AR environment.