Kütüb-i Sitte is an Android app that contains the Hadiths. It allows you to add and share your favorite Hadiths. The app has different backgrounds, two fonts, and dozens of text colors to choose from. There are 7300 Hadiths available in the app. Additionally, you can access any Hadith by clicking on the Hadith number on the main page and entering the Hadith number in the small window that appears.

However, there is a potential issue with the app. If you experience phone or tablet lockups when clicking on your favorites, it may be due to the app's text files being deleted or corrupted. To fix this, remove the app from your phone and delete the "kutubisitte" folder on your memory card if it exists. Then, reinstall the app from the market, and it should work flawlessly.