App APIs REPL is a Chrome packaged application designed for developers to experiment with Chrome App APIs. This tool provides a read-eval-print loop (REPL) environment that enables users to run API functions, listen for events, and execute custom JavaScript code. It serves as an interactive platform for testing and learning about the available API functionalities.

The application includes built-in functions to enhance the user experience while exploring the APIs. Users can access detailed documentation and limitations to better understand how to utilize the tool effectively. This free add-on is ideal for developers looking to deepen their knowledge of Chrome App APIs in a hands-on manner.