CF Performance Mirror

Analyze your Codeforces performance — solve time, failure rates, rating changes, and errors by division and time range.

Track your Codeforces performance with clear insights into solve times, failure rates, rating changes and problem-level errors, broken down by division and time range. Filter by contest type and focus on selected topics, rating ranages to quickly spot weak areas and improve efficiently, all directly on your profile page. How it works Runs entirely client-side on `codeforces.com/profile/<handle>`. Fetches from three public Codeforces APIs (`user.status`, `contest.list`, `user.rating`). No server, no tracking — all computation happens in your browser.