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Online Java compiler, visual debugger, and AI tutor
The only tool that lets you visually debug your Java code step-by-step.
Please wait ... your code is running (up to 10 seconds)
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Java
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Python 3.11
C (C17 + GNU extensions)
C++ (C++20 + GNU extensions)
JavaScript (ES6)
Visualize Execution
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hide exited frames [default]
show all frames (Python)
inline primitives and try to nest objects
inline primitives, don't nest objects [default]
render all objects on the heap (Python/Java)
draw pointers as arrows [default]
use text labels for pointers
