LeetCode Prep
Adaptive coding-interview prep that always answers one question: which data structure or algorithm should I practice next to get interview-ready fastest?
Stop grinding random problems
Most people grind a random problem list and hope it sticks. This trainer builds a living model of which patterns you've mastered, escalates difficulty only when you're ready, and tells you exactly what to practice next — across 21 chapters, 44 core skills, 95 interview problems, and 250+ runnable coding problems you can solve in the browser in JavaScript or Python.
Adaptive Skill Assessment
A short, adaptive set of problems estimates your interview readiness and maps every chapter in about 15 minutes.
Take the assessment →Chapter-by-Chapter Curriculum
Start with Arrays & Hashing, build through Linked Lists and Trees, reach Graphs and Dynamic Programming, then level up with System Design and cloud architecture.
Browse the curriculum →Personalized Study Plan
Daily, weekly, and monthly tasks prioritized by interview impact, mastery gaps, and what you're about to forget.
See your plan →Adaptive Practice
Solve a problem and we serve a harder one; miss it and we step back. Every answer updates your live skill map.
Start practicing →In-Browser Code Editor
Write real JavaScript or Python — every problem ships in both languages, including linked-list, tree, and class-design problems — and run it against visible and hidden test cases for 250+ runnable problems, from Blind 75 to NeetCode 150 and beyond, with progressive hints and AI code review when you're stuck.
Open the editor →AI Coach & Hints
An AI coding-interview coach explains patterns, nudges you with hints that never spoil the answer, and reflects on your weak spots — tuned to your skill profile.
Meet your coach →Mentor Monitoring
Invite a mentor to follow your readiness, gaps, and momentum read-only — and receive targeted problem assignments straight into your plan.
Connect a mentor →The adaptive loop
- 1Assess your skills across every pattern
- 2Follow the chapter curriculum, foundations first
- 3Practice the highest-impact patterns
- 4Solve real problems in the in-browser code editor
- 5Solve harder problems as your mastery grows
- 6Track your interview-readiness prediction