PreK Journal: 3 - 4 years. Kindergarten Journal: 5 - 8 years. These journals will help early learners master the 26 letters of the English alphabet. The FREE mobile app helps these journals come alive in 3D (augmented reality) for an engaging and interactive experience in the classroom or at home! Early learners now have a fun way to demonstrate their growing understanding of upper and lowercase letters and letter sounds. Includes 1 PreK Journal and 1 Kindergarten Journal.