🚀 Code Replay
Track. Solve. Revise. Repeat.
Code Replay is a powerful browser extension that helps competitive programmers and interview aspirants track coding problems directly into their own Google Sheets — with structured notes, intelligent revision tracking, and multi-platform support.
Code Replay now supports:
✅ LeetCode
✅ Codeforces
✅ GeeksforGeeks
✅ CodeChef
✅ HackerRank
✅ CSES
✅ InterviewBit
✅ AtCoder
✨ What’s New (Latest Update 2.1.0) 🔥 Improvements & Fixes
✅ Fixed LeetCode difficulty detection (now correctly detects Easy / Medium / Hard)
✅ Added support for 8 major coding platforms
✅ Improved CodeChef title detection
✅ Improved tag filtering logic
✅ Enhanced UI design & layout (modern dark premium feel)
✅ Better error handling
✅ More reliable revision scheduling
✅ Improved content script detection
🟢 Extension Status Indicator
At the top of the popup you will see:
🟢 Ready • Detected: PlatformName
✔ If you see “Detected”
The extension is correctly attached to the problem page.
❌ If you do NOT see it
👉 Refresh the page once.
🔄 Important: When Switching Platforms
If you move from one platform to another:
LeetCode → Codeforces
Codeforces → AtCoder
AtCoder → CSES
etc.
👉 You must refresh the page once before saving.
This ensures the extension re-attaches correctly.
⚠ Important Usage Rules (Codeforces, CSES, AtCoder)
You must save problems only from the actual problem/task page.
🔵 Codeforces
Save only from:
/problemset/problem/...
or
/contest/.../problem/...
❌ Do NOT save from:
Submit page
Standings page
Contest overview
Results page
🟢 CSES
Save only from:
/problemset/task/...
🟡 AtCoder
Save only from:
/contests/.../tasks/...
If you try saving from unsupported pages, you may see:
Open supported problem URL
This is expected behavior.
🔥 Features
✅ Automatic problem detection
📌 Save problem title + direct link
📊 Difficulty tracking (Auto-detected)
🏷 Pattern & tag organization
📝 Personal approach & mistake notes
⏱ Time & space complexity logging
🔁 Spaced revision reminders (1d / 3d / 7d / 14d)
🚀 One-click “Open Due Revisions”
💎 Modern premium UI
🖼 Screenshots 🔹 Extension Popup
Setup takes 3–5 minutes.
Step 1 – Create Google Sheet
Go to https://sheets.google.com
Click Blank
Rename it: Code Replay Tracker
Create a sheet tab named exactly:
Questions
⚠ The tab name must be exactly Questions
Step 2 – Get Your Sheet ID
Your sheet URL looks like:
https://docs.google.com/spreadsheets/d/YOUR_SHEET_ID/edit#gid=0
Copy the long string between:
/d/ and /edit
That is your SHEET_ID
🚨 IMPORTANT: Google Apps Script Must Be Updated
If you updated to the latest extension version:
👉 You must re-copy the Google Apps Script file.
Even if your old version was working.
This prevents:
❌ Failed to fetch errors
❌ CORS errors
❌ Revision scheduling issues
❌ Difficulty not saving
❌ Column mismatch issues
Step 3 – Add Google Apps Script
Inside your Google Sheet:
Extensions → Apps Script
Delete all existing code in Code.gs
Open this file from repository:
apps-script/Code.gs
Copy full code
Paste into Apps Script
Step 4 – Paste Your Sheet ID
Find this line:
const SHEET_ID = "PASTE_YOUR_SHEET_ID_HERE";
Replace with:
const SHEET_ID = "your_real_sheet_id_here";
Click Save
Step 5 – Deploy as Web App
Click:
Deploy → New deployment
Choose:
Type: Web App
Execute as: Me
Who has access: Anyone
Click Deploy Authorize permissions
Copy the Web App URL (must end with /exec)
Example:
https://script.google.com/macros/s/XXXXXXX/exec
⚠ Do NOT copy the /dev link.
Step 6 – Connect the Extension
Open Code Replay popup
Paste /exec URL
Click Save
Open a supported problem page
Click Save
🎉 Your problem will now appear in Google Sheets.
🔐 Privacy
✅ No personal data collection
✅ No external database
✅ All data stored in YOUR Google Sheet
✅ Fully open source
🛠 Tech Stack
Manifest V3 Extension
Content Scripts
Background Service Worker
Google Apps Script (Web App)
Google Sheets API
📁 Project Structure extension/ manifest.json popup.html popup.js background.js content.js icon.png
apps-script/ Code.gs
🚀 Future Improvements
Dashboard analytics
Smart tag enhancement
Platform difficulty normalization
Performance statistics
Mobile-friendly sheet template
🤝 Contributing
Contributions are welcome!
Please read:
👉 View Contribution Guide
⭐ Support
If this project helps you:
⭐ Star the repository 📢 Share with your friends 🚀 Build consistency