Why we built it
Most learning tools hand you a fixed set of problems and someone else's solution to copy. You read it, it makes sense, and then you sit down with a blank editor and freeze. Understanding someone else's code is not the same skill as understanding your own.
LearnBug flips that. You write — or paste — your code, bugs and all, and it becomes fully visible: variables update in front of you, the call stack grows and unwinds, loops iterate, and memory changes in real time. When something breaks, you see the exact line and the exact state that caused it.
What LearnBug does
- Step-by-step execution — run any Python code one line at a time, at your own pace.
- Memory & call-stack visualization — watch data structures build and recursion unwind.
- AI error explanations — cryptic errors translated into plain English.
- Code trace visualizer — every branch, loop and function call mapped as a flow.
- A full DSA problem library — curated problems with visual breakdowns, not just answers.
Who it's for
Students learning data structures and algorithms, developers prepping for interviews, and self-learners who want to actually understand what their code does — not just get it to pass. Institutes and bootcamps use LearnBug in the classroom to replace whiteboard drawings with something students can run themselves.
Where we are
LearnBug is in beta. Python is live, Java is in beta, and JavaScript and C++ are on the way. During beta, every individual gets full access, completely free — no card, no catch. Have feedback or want to bring LearnBug to your institute? learnbug.support@gmail.com.