Welcome to Instant Command

Instant Command is a browser workspace for writing, running, and testing code. A project contains its files and a target: a supported Arduino/ESP-IDF board or Java 21. The Run action builds the current project and starts the available runtime for that target.

Arduino UNO R3, ESP32, ESP32-C3 and ESP32-S3 have browser execution paths with different capabilities. Arduino ESP32-family targets also support physical flashing. ESP-IDF ESP32/C3 have simulation adapters; ESP-IDF S3 build/runtime remains unavailable. See Supported boards. Java projects run as programs with a terminal for input and output.

Your account determines the surrounding workflow:

Workspace	Use it to
Solo	Create and organize personal projects.
Student	Join a class, work on assignments, run visible tests, and submit attempts.
Teacher	Create classes and assignment content, configure tests, and review submissions.

Start with creating an account, then create a project. If you are working from an assignment, follow the student path after joining your class.