LeetCode Visualizer
Visualize your code. Understand every step.
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We just launched ššššššØšš šš¢š¬š®šš„š¢š³šš«, a free tool that shows what your code is actually doing, line by line. The problem: when a LeetCode solution fails, you're left staring at code and guessing what line 14 did. Print statements only get you so far, and a recursion call stack is basically invisible. āŖļø Step through code, line by line, forwards and backwards. āŖļø Watch data structures such as arrays, grids, trees, linked lists and graphs come alive. āŖļø Supports Python, C++ and Java.
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More like this: all 120 launches in interactive coding education platforms →
PH · launched Oct 14, 2026 · 1 upvote (top 67%)
- Education
- Dev tools
- Developer
- Not AI
- Hobby / open-source project
- Education
- Developer Tools
- Online Learning
Similar launches
See all 119 similar launches →Could you build this?
Partial Building the UI with tree and array visualizations is easy, but securely executing arbitrary user code server-side while tracking variable mutations and call stacks frame-by-frame requires advanced sandboxing and AST instrumentation.
What it would actually take: This requires an isolated code execution environment (e.g., Docker/gVisor sandboxes) instrumented with AST rewriters (Babel for JS, Python AST/trace module) to emit execution trace events at every step. The primary technical difficulty is reliably parsing and step-debugging arbitrary algorithms across multiple languages safely at sub-second latency without DOSing infrastructure.
Competitors
Other products that read as similar to this one : 119 launches clear the similarity bar, closest 8 shown.
Attention rank: #67 of 120 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 342 days after the earliest competitor.
- Openleetcode · hn · 2026-08-18 · 73 upvotes · similarity 0.51
- Openleetcode · hn · 2026-08-11 · 5 upvotes · similarity 0.50
- CodeSamjho · ph · 2026-09-30 · 1 upvotes · similarity 0.49
- SQLens · ph · 2026-09-09 · 1 upvotes · similarity 0.49
- A Satellite View for Python Code · hn · 2026-02-09 · 7 upvotes · similarity 0.48
- CodeViz · ph · 2026-09-13 · 2 upvotes · similarity 0.46
- Leetcode_Problems · github · 2026-10-10 · 16 upvotes · similarity 0.45
- PyViz · ph · 2026-09-19 · 1 upvotes · similarity 0.45