Katha Upanishad is a free Android application developed by Spirit Apps that offers a comprehensive guide to understanding the concept of death. The app is categorized under Education & Reference and is specifically listed under Books. It is one of the mukhya or primary Upanishads commented upon by Shankara.

The Katha Upanishad consists of two chapters, each divided into three sections that contain between 15 and 29 verses apiece. The app offers an in-depth analysis of these verses and provides a detailed explanation of the philosophy behind them. It also contains passages that suggest contact with Buddhist ideas, which scholars believe were likely added after the fifth century BCE. The Katha Upanishad is considered a middle Upanishad and is number three in the Muktika canon of 108 Upanishads.