Fear Greed Index is a free Android app developed by Boost Robotics that analyzes emotions and sentiments from different sources to provide a simple number that shows the sentiment for Bitcoin and other large cryptocurrencies. The app falls under the category of Business & Productivity and subcategory of Finance.

The app offers a home screen widget that is available in a paid subscription with a 3-day free trial period. The widget is set to refresh automatically every 30 minutes. However, the app may face issues with widget refreshing on some devices due to the system preventing it. In such a case, the user can check the battery savings options and turn it off for this application.