The "فارسی زبان کا آسان قاعدہ" app, developed by Riajul Islam, is a free educational reference tool available on Android. This app has a user-friendly interface and aims to help users learn Persian grammar with ease.

One of the standout features of this app is the ability to zoom in on text. Users can easily zoom in by double-tapping the screen or using two fingers. Additionally, users can view the entire screen by clicking on the "+" button.

Another great feature of this app is that it automatically saves the last page you read, so you can easily continue from where you left off. This app is perfect for anyone looking to learn Persian grammar in a convenient and accessible way.