Never Miss a Contest. Track Your Rating.
Code Calendar unifies live contest schedules across LeetCode, Codeforces, CodeChef & AtCoder, interactive rating progression curves, and 52-week contribution heatmaps in one high-performance, on-device Android app.
PLATFORMS
LeetCode & CF
STORAGE
Local Room DB
TRACKING
Zero Telemetry
LeetCode Biweekly Contest 150
Sat, Aug 15 · 08:00 PM IST
Real-Time Contest Radar
Aggregated start times, direct links, and millisecond alarms for competitive programming platforms.
LeetCode Biweekly Contest 150
Sat, Aug 15 · 08:00 PM IST
Codeforces Round 998 (Div. 2)
Sun, Aug 16 · 08:05 PM IST
CodeChef Starters 174 (Div. 1-4)
Wed, Aug 19 · 08:00 PM IST
AtCoder Beginner Contest 393
Sat, Aug 22 · 05:30 PM IST
Interactive Rating Curves
Track your rank growth across Codeforces, LeetCode, and CodeChef in one centralized dashboard.
vishal_21
Candidate Master30-Day Streak Habit Tracker
Disciplined daily solve tracker with milestone checks and shareable social story cards.
100% On-Device Room DB
All pinned contests, alarms, CP handles, and streaks are persisted in your local SQLite Room database with zero server telemetry.
Crafted for Clarity & Peak Focus
Modern Material 3 typography, seamless light & dark mode support, and data-dense developer widgets.
Buy Me a Coffee
Code Calendar is 100% free, privacy-first, and completely ad-free with zero trackers. If you find contest alarms and rating tracking helpful, voluntary contributions help fund server costs, development tools, and future open-source releases.