Application itself is excellent, almost exactly what every muslim needs.
But, few improvements would significantly increase it's usefullness.
First, landscape mode does not automatically zoom when you change the page, which is quite annoying. I would like to see it working like in Quran app by Kuwait Finance House, which I was using before.
Secondly, I would like to have more strong way of marking the page when I read "khatmah" (what I regularly do) from KuranıKerimDiyanet .
For example, the notes option is excellent, and I use it to mark some of the ayats that I would like to memorize, or which are from some reason interesting to me. But when I open this ayat marked in the note from the main menu, the text and the mark go to that place in Qur'an, and if I don't remember the page on which I was in khatmah, it is lost.
These teo improvements would rapidly improve KuranıKerimDiyanet .
Calligraphy is beautifull and very simple, as well as KuranıKerimDiyanet .
Please keep it simple in the future to keep it's usefullness.