Kamus Kosa Kata Durushul Lugho is an Android application created by rdstudio to assist students or learners of Arabic language using the Durushul Lughoh book. It is an educational and reference app that offers three main menus: Kitab, Kamus, and Latihan.

The Kitab menu displays the contents of the Durusul Lughoh book, while the Kamus menu contains new vocabulary words that have not been understood in each chapter. The Latihan menu is used to review the vocabulary words learned in each chapter.

In addition, the app has a Bantu Kami menu that allows users to directly communicate with the developer for feedback or information regarding future updates of the app.

The app was created as part of the developer's dakwah efforts, and users are encouraged to participate in spreading the knowledge of the Arabic language. As Syaikhul Islam Ibnu Taimiyyah said, "Knowing the Arabic language is obligatory to understand Al-Kitab and As-Sunnah." The app hopes to be a means of spreading good deeds and knowledge.

Overall, Kamus Kosa Kata Durushul Lugho is a useful app for anyone who wants to learn Arabic and understand the Durushul Lughoh book better.