"Riyadh as-Salihin" is a free Android app developed by Chems Innovation Studio Inc. that contains all the hadiths from the book of the same name. The app is completely ad-free and doesn't require any special permissions to run. It also offers a search function and the ability to add chapters/hadiths to favorites, as well as add notes to chapters. The material design of the app is user-friendly, and the hadith text is color-coded. The app also allows users to change the font size and type.

The "Riyadh as-Salihin" book is a compilation of verses from the Qur'an and hadith by Al-Nawawi. It consists of about 1905 hadith divided across 372 chapters, many of which are introduced by verses of the Quran. Please note that this app is only available in Arabic language.