If you are looking for a free app that provides you with authentic Hadiths, then سنن الترمذي is the one for you. Developed by Al-Reda Apps, the app contains all the Hadiths from the "Jami' at-Tirmidhi" book, also known as Sunan at-Tirmidhi. The app is only available in Arabic language.

One of the best features of the app is its search function, which allows you to look for specific Hadiths with ease. Additionally, you can add your favorite chapters and Hadiths to your favorites list and add notes to them. The app is user-friendly, and the Hadith text is color-coded, making it more accessible to read. Moreover, the app does not require any special permissions to run, and you can change the font size and type according to your preference. Overall, the app is an excellent resource for those interested in Hadiths, with a simple and elegant Material Design.