CodeDuel puts you head-to-head against Claude on real coding problems. Same problem. Same time. One winner.
Because the best way to stay sharp in the age of AI is to compete with it.
▍▍A duel takes about 30 minutes. Results are instant.
Choose from 20+ problems across 6 categories and 3 difficulty levels. New problems added regularly.
Code in the browser with a full VS Code-style editor. Python, JavaScript, and Java supported at launch.
Hit submit and Claude races to solve the same problem. Both solutions run against the same test cases.
Results show scores side by side. Claude explains its approach so you actually learn something every time.
Free to start. Upgrade when you want the full competitive experience.
You and Claude receive the same problem simultaneously. Both start coding. One wins.
Correctness, speed, and code quality — the same way a real code review works.
After every duel Claude explains its approach and where your solution could improve.
Your rating goes up when you win and down when you lose — just like chess.
Your dashboard identifies which categories you consistently lose in and surfaces practice problems.
Track your win rate, streak, ELO over time, and performance by difficulty and category.
Arrays, Strings, Trees, Graphs, Dynamic Programming, and System Design.
Free tier is limited to 3 duels per day. Pro unlocks unlimited.
You vs. a timer. Designed for interview prep. No AI opponent. No learning from comparison.
You vs. Claude. Designed for staying sharp. Real competition. Learn from every duel.
The best way to not be replaced by AI is to be better than it. CodeDuel gives you a way to measure that — and close the gap.
Start free. Upgrade when you want the full experience.
Every developer using AI tools wonders if their raw skills are slipping. CodeDuel gives you an honest answer — and a way to improve.
Start Dueling