مستقيم is a comprehensive and user-friendly Islamic application that includes features such as reading and listening to the Quran, 10 interpretations, accurate prayer times and azan, authentic Hadiths, morning and evening supplications, smart tasbeeh, various dhikr and prayers, ruqyah shar'iyyah, religious questions, stories of the prophets, excerpts from the Quran and Sunnah, and sayings of the righteous. The app also contains an Islamic encyclopedia with thousands of books and audio clips, daily wirds, achievements, dhikr notifications, audible prayers on the Prophet, Qibla direction, updated video content, Hijri timing, dark mode with 4 colors, and font size enlargement for the visually impaired.

The app features the Quran with functions like listening while reading specific verses, detailed verse information, bookmarking, chapter indexing, advanced word search, color customization, and a mode resembling the physical Quran. It also offers audio Quran with over 200 reciters, 8 recitations, favorites, search, filtering, and offline playback capabilities.