LeetCopilot

LeetCopilot is a free AI-powered Chrome extension that transforms your LeetCode practice into a comprehensive coding interview preparation system. Unlike generic AI assistants, LeetCopilot is purpose-built for data structures and algorithms, offering three integrated modes that work seamlessly within the LeetCode platform.

Chat Mode: provides intelligent, Socratic-style hints that guide you toward solutions without spoiling the learning experience. The AI reads your code in real-time and offers context-aware suggestions based on your actual implementation. You can highlight any text or code on LeetCode pages to get instant answers without switching tabs, making problem-solving more efficient and focused.

Interview Mode: simulates realistic FAANG-style technical interviews with an adaptive AI interviewer. Practice explaining your approach to problems while the AI challenges your reasoning and problem-solving process. Choose from multiple interviewer personalities—friendly, neutral, or challenging—to prepare for different interview styles. After each session, receive detailed scores and actionable feedback to identify specific areas for improvement.

Study Mode: automatically builds a personal knowledge base from every problem you solve. The extension generates comprehensive notes that extract approaches, time complexity analysis, and key insights. These notes are converted into spaced-repetition flashcards that help you review at optimal intervals for long-term retention. Additionally, LeetCopilot creates personalized study roadmaps tailored to your weak areas, ensuring you focus on the topics that matter most.

Beyond these core modes, LeetCopilot offers advanced features including real-time code execution and visualization, edge case generation, and data structure visualization. The AI is fine-tuned specifically for data structures and algorithms, ensuring answers are not only correct but also efficient and interview-ready.

LeetCopilot integrates directly into LeetCode, eliminating the need to switch between multiple tools or platforms. It's compatible with Chrome, Edge, Brave, and Opera browsers, and completely free to use. Whether you're a beginner learning the fundamentals or an experienced engineer preparing for your next interview, LeetCopilot provides the tools you need to master LeetCode and land offers at top tech companies.