CoJitsu by Anjney Lawaniya

CoJitsu is a lightweight, multi-platform daily problem tracker designed for competitive programmers. It aggregates the "Problem of the Day" (POTD) from top algorithmic platforms into a single, seamless dashboard.

Core Features:

Multi-Platform Integration: Get your daily challenges from Codeforces, LeetCode, and AtCoder all in one unified UI.

Smart Difficulty Scaling: Enter your Codeforces rating, and the extension automatically translates and normalizes the difficulty for AtCoder (via the Kenkoooo API) to ensure you are always practicing at the perfect level.

Strict Modern Meta: Codeforces problems are strictly filtered to exclude outdated contests (pre-2020), ensuring you practice relevant, modern algorithmic paradigms rather than obscure legacy math.

Streak & Calendar Tracking: Keep yourself accountable with visual streak counters for each platform and a fully traversable historical calendar.

Extra Practice Module: Done with your dailies? Instantly roll curated extra problems based on specific topics and ratings without messing up your official POTD streak.