ATSim is an interactive, aviation-related air traffic control (ATC) radio simulator. It is developed to enable air traffic controllers to learn and master the radio communication and phraseology on their own time. This is accomplished through a combination of interactive AI-based pilots and the immediate feedback of ATSim.

In order to interact with the pilots, the air traffic controllers can simply speak to the app and receive immediate feedback on their communication and pronunciation. The app provides a self-guided means to practice and master the radio through repetition and immediate feedback.

The goal of ATSim is to provide the necessary training to the air traffic controllers so that they can become proficient in aviation phraseology and communication.