LeetViz

Interactive visualizers for LeetCode problems — powered by the community.

LeetViz: Interactive problem visualizations directly inside LeetCode. LeetViz seamlessly integrates into LeetCode to help you visually understand what complex problems are actually asking. When you open a supported LeetCode problem, LeetViz automatically loads an interactive, step-by-step animation in your Chrome side panel—without obstructing your coding environment. Key Features: Problem Dry-Runs: Watch a frame-by-frame visualization of the exact problem statement and example test cases. Understand what the problem is asking before you start coding, without the solution being spoiled! Progressive Hints: Unlock gentle structural hints when you're stuck, rather than immediately jumping to the LeetCode discussion tabs. Custom Test Cases: Run the visualizer against LeetCode's exact preset examples. Community-Driven: All visualizers are open-source. Don't see a visualizer you need? Generate one with AI and submit it to the growing LeetViz registry! Perfect for: Visual learners, interview prep, and anyone struggling to physically trace complex logic in their head.