Mongolian Dictionary is an Android-based application developed by DLine LLC. It is a dictionary designed for those who are interested in learning the Mongolian language, specifically the old vertical script. This application is free and falls under the Education & Reference category.

The dictionary contains a vast collection of words written in both the modern Mongolian alphabetic writing and the old script. Users can search for words in the modern script and find out how it is written in the old script, and vice versa. This feature makes it an excellent tool for those who are trying to learn the old vertical script. Mongolian Dictionary is user-friendly and easy to navigate, making it accessible to all levels of learners.