Sejarah Kelas 11 Semester 2 Ku is an Android application created by rappsody that contains the curriculum 2013 textbook for the Indonesian History subject, specifically for grade 11 students in the second semester. The app is designed to help students learn history anytime and anywhere. The BSE curriculum 2013 is a free school book published by the Ministry of Education and Culture (Kemdikbud) and can be distributed to the general public for free.

This application has several outstanding features such as automatic page play, zoom in and zoom out, responsive display, bookmarking or marking specific pages, page search, table of contents, and thumbnail pages. The application covers the material according to the Indonesian History subject matter for grade 11 students in the K13 curriculum. The material covered includes Chapter 5: "The Rising Sun Curtain," Chapter 6: "Indonesia's Independence," and Chapter 7: "Rev. Upholding the Banner of NKRI."