🕒 Contest Clocker – Never Miss a Coding Contest Again 🚀

#competativeprogramming #extensions #javascript #leetcode

Are you into competitive programming? Tired of missing contests across Codeforces, LeetCode, and CodeChef?

Contest Clocker is a free, lightweight Chrome Extension that helps you stay on top of upcoming contests with smart reminders, calendar integration, and powerful filtering — all in one click.

🔗 Install from Chrome Web Store

🌐 Website

💡 Why I Built This

As a developer who regularly participates in contests and interview prep, I found myself constantly switching between platforms and forgetting start times.

That’s when I built Contest Clocker – a zero-friction solution to get notified, filter contests, and sync them to your Google Calendar.

⚙️ Core Features (v2.0)

✅ Multi-Platform Support: Codeforces, CodeChef, LeetCode (more coming!)

🔔 Smart Notifications: 15 min / 1 hour / 1 day before contest

📅 Add to Calendar: 1-click Google or Outlook sync

🎯 Advanced Filters: By duration, platform, contest type

🌓 Dark/Light Theme: Beautiful UI with smooth toggle

♿ Accessibility: Font size, high contrast mode, ARIA support

📊 Configurable View: Hide/show columns, compact mode

⚡ Superfast Load: API cached, blazing UI

👨‍💻 Who’s This For?

Competitive programmers tracking multiple sites
Students preparing for interviews (DSA grind!)
ICPC / Kickstart / CodeJam participants
Anyone serious about staying consistent

🧪 Upcoming Ideas

Personal dashboard for contest history
Telegram / WhatsApp daily alerts
Contest difficulty predictions
Auto-sync with Google Calendar every 24 hours (Pro)

🛠 Tech Stack

Frontend: Vite + React
Styling: CSS Modules, Dark/Light toggle via localStorage
Chrome Extension: MV3 + Manifest permissions + popup UI
Google APIs: Calendar sync + OAuth2 scopes
Hosting: Netlify (with HTTPS + custom domain)
Domain: contestclocker.com via Spaceship

🧠 Behind the Scenes

It started as a side project and now has dozens of daily users. I’ve just added a polished UI, more filters, and a polished privacy + domain setup for Google OAuth.

If you're building Chrome Extensions, feel free to check out how I handled domain + SSL + privacy policy to pass Google OAuth verification smoothly.