C4th Home School for Teacher is an Android app developed by 株式会社EDUCOM for teachers to communicate and share information with parents. The app can only be used in areas or schools that have implemented the C4th Home & School system. Parents need to install the C4th Home & School app to access the information shared by the school. The app offers various features that enable the school to share information about school events, classes, and extracurricular activities using text, photos, PDF files, and calendars. The target audience can be chosen from the school, grade, class, or individual level. The app also features an approval request function, approval function, read status check function, and safety confirmation function. However, the features available may differ depending on the region or school.