GoTutor is a free Chrome add-on designed for developers and learners of the Go programming language. This tool integrates seamlessly with Go by Example and Go Tour pages, providing users with an 'Open in GoTutor' button that simplifies the process of code visualization. With this feature, users can easily inspect their Go code execution, which is particularly beneficial for understanding complex concepts and debugging.

The main functionality of GoTutor revolves around visualizing the execution of Go code step-by-step. Users can explore goroutines, stack frames, and variables in real-time, making it an invaluable resource for both beginners and experienced programmers looking to deepen their understanding of Go. This add-on enhances the learning experience by allowing users to see how their code behaves in a structured manner.