Digital technologies and the instructional contexts in which they are embedded can increase students' access to meaningful learning opportunities. Although there is a tradition of designing and integrating digital tools in secondary-grades project-based science instruction to enhance learners' access to disciplinary learning, the elementary grades have received less attention. This has left classroom teachers with limited guidance for leveraging affordances of digital tools in project-based learning (PBL) with younger learners. In this article, we describe the design and integration of digital tools in Multiple Literacies in Project-based Learning, a recent elementary-grade project-based science curriculum that integrates literacy and mathematics. We use the principles of Universal Design for Learning to characterize the affordances of these digital tools, with attention to how the interplay of the tools and the PBL environment in which they were embedded enhanced access to learning opportunities for all students.