ابزار تاریخ شمسی is a free Android app developed by Majid Zare that provides a simple and efficient way to convert Iranian (also known as Persian or Solar) dates to Gregorian (also known as Christian or Western) dates and vice versa. This app is very lightweight and has a user-friendly interface with four main features that include the ability to convert dates, calculate the difference between two Iranian dates, and two widgets for date conversion and date difference.

One of the most useful features of this app is its ability to accurately calculate leap years and the varying number of days in each month of the Iranian calendar. This app is a great tool for anyone who needs to work with Iranian dates and wants a reliable and easy-to-use app to do so.