In this paper, we present SAPHIR, a multilingual authoring tool producing a Progressive Web App, usable on computers, tablets, and smartphones, online or offline. We presented our design process, the architecture of the system, the model on which it is based, and its main parts: SAPHIR it-self is the main software proposing activities to children to learn and play; MINE is the authoring tool used by pedagogical designers and resources translators to create and translate resources without requiring any programming skills; TAILLE is dedicated to teachers to whom he provides educational explanations to use SAPHIR with their learners. The different parts were used with both pedagogical designers and students.