叫叫 is an iPhone application developed by Shusheng Chengdu Technology Co. Ltd. It is a free educational and reference program designed for children. The app aims to enrich reading content and stimulate children's interest in reading.

The program focuses on reading and thinking, helping families foster children's core qualities such as good character, behavior, and scientific thinking, as well as key abilities including reading, thinking, expression, and behavior. It aims to enhance children's overall quality.

叫叫 is built on the principles of respecting rules, emphasizing interests, centering around reading, and valuing encouragement. It provides children with scientific reading plans based on their growth and development patterns. The app also aims to ignite children's interest in reading and help them develop good reading habits.

With 叫叫, children can gain new knowledge through reading, ensuring that they not only read but also gain valuable insights. The program also emphasizes the importance of children's reading experience, sense of achievement, and feedback, which help improve their proactive reading skills.