Runtime state plus reasoning
See the current state while AI explains why the step matters.
Stepwise
See code run, step by step.
Step through algorithms and code with live visualization, runtime state, and AI explanations for the line you're on.
Step through code →
Java is supported today. More languages are planned.
AI + visualization for code execution
Why step-by-step visualization works better
Step through code execution as it happens, with code visualization that makes algorithm execution, data structures, and runtime state easier to follow. AI explains the reasoning behind the current step.
Grounded in the step on screen
Each explanation follows the current line and runtime state, so the reasoning stays connected to what you see.
Use AI when it helps
Ask as you go or follow each step automatically, without changing how you run code.
Follow real data changes
Inspect arrays, trees, graphs, and objects without losing the execution context behind them.