Недуги сердца, which translates to "Heart Diseases" in English, is an Android app that presents a book about the diseases that can affect the heart. The book is written by the authoritative Muslim scholar Muhammad Salih Al-Munajjid. The app is free to download and falls under the Education & Reference category.

The book delves into the importance of the heart in Islamic teachings and provides a detailed description of the diseases that can affect it. The author uses Quranic verses, Hadiths of the Prophet, and quotes from well-known Muslim scholars such as Ibn al-Qayyim, Ibn al-Jawzi, and Ibn Rajab as the basis of this work. The book also offers practical methods to treat these diseases and provides advice on how to prevent them.

Overall, Недуги сердца is an informative app that will appeal to anyone interested in maintaining their moral and physical health, not just Muslims.