Tazkeer - Hadith Collection - 19 Books is an Android education and reference app developed by UsmanPervez. It is a free app that offers a vast collection of Hadith books with Arabic, Urdu, and English translations. The app has a user-friendly Material Design UI with multiple color themes, five Arabic fonts, and four Urdu fonts. It also allows users to customize the font size and color of the Arabic and Urdu text.

One of the most useful features of the app is its advanced search functionality in Urdu and English translations, which makes it easier to find specific Hadiths. The app also allows users to save unlimited bookmarks and continue reading from where they left off. Additionally, users can copy and share Hadiths with multiple options, jump to Hadiths quickly, and switch between dark and night themes for better readability at night.

Overall, Tazkeer - Hadith Collection - 19 Books is a valuable resource for anyone interested in Islamic literature and Hadiths. It is a well-designed app with a vast collection of books and useful features that are easy to use. It is highly recommended for anyone who wants to learn and understand Hadiths more deeply.