CF StatLens is a Chrome add-on designed to enhance the Codeforces experience by providing detailed analytics on user submissions. It replaces the standard activity heatmap with an advanced tooltip that shows daily statistics such as total submissions, accepted counts, and accuracy percentages. This tool enables users to gain insights into their problem-solving performance and track their progress over time, making it an invaluable resource for competitive programmers.

Key features of CF StatLens include instant daily stats, accuracy tracking with visual progress bars, difficulty breakdowns of solved problems, and identification of the most practiced algorithmic topics. Additionally, it keeps track of personal bests and submission streaks, all while ensuring a fast and seamless user experience through its optimized caching architecture. This makes CF StatLens a powerful tool for anyone serious about improving their coding skills.