Hindi Patra Lekhan is an Android application developed by Hindi Gatha that provides over 200 Hindi letters in various categories. The app is designed to help users write letters in Hindi with ease and convenience. The interface is simple and user-friendly, making it easy for users to navigate and find the letters they need. The app is regularly updated with new letters and features to ensure users have access to the latest information.

The main categories of Hindi letters available in the app are personal, request, business, and official. Each category contains a wide range of letters that users can choose from. The app is designed to help users write letters for different purposes, whether it's for personal or professional use.