Kevin Xu Blog

Products

Welcome to my collection of apps and tools I’ve built to solve everyday problems.

πŸ“±

LifePixel

Daily habit tracking app for iOS. Build your life pixel by pixel with 5 essential habits and beautiful progress visualization.

iOS Free
Learn More App Store
🌐

Knowledge Planet PDF Downloader

Chrome extension for bulk downloading PDFs from Knowledge Planet. One-click download with smart filtering.

Chrome Free
Learn More Install
πŸš€

More Coming Soon

I'm constantly building new tools and apps to solve everyday problems. Check back for updates!

Various TBD
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Product Details

LifePixel

πŸ“± LifePixel

Build your life pixel by pixel with our simple daily tracking app.

πŸ“± Quick Start

LifePixel helps you track 5 daily habits: Sports πŸƒβ€β™‚οΈ, Healthy Food πŸ₯—, Relationships ❀️, Reading πŸ“š, and Sleep 😴.

  1. Download from App Store
  2. Open app (no signup needed!)
  3. Tap checkmarks to complete habits
  4. View progress in Summary tab

🎯 How to Use

Daily Tracking

  • Tap checkmarks to mark habits complete
  • Use date picker to view/edit past dates
  • Data saves automatically

View Progress

  • Daily tab: Today’s habits
  • Summary tab: Weekly, monthly, yearly stats
  • Activity map: Visual progress calendar

πŸ”§ Need Help?

App Issues

  • App crashing? Force close and reopen
  • Data not saving? Restart your device
  • Can’t navigate dates? Tap the date picker at top
  • Display problems? Update app from App Store

Quick Fixes

  1. Close and reopen app
  2. Restart your device
  3. Update to latest iOS version
  4. Reinstall app if needed

πŸ”’ Privacy & Data

Your data stays on your device - we don’t collect or store anything.

  • βœ… Works offline
  • βœ… No account needed
  • βœ… Data included in iOS backups
  • ❌ No cloud storage (coming soon)
  • ❌ No data export yet (planned)

View Full Privacy Policy β†’

πŸ“ž Contact & Support

Email: xkevinj@gmail.com
Response: 24-48 hours

Before emailing:

  1. Try restarting the app
  2. Check for app updates
  3. Update iOS

Include in your email:

  • iOS version
  • Device model
  • What happened

πŸ“Š Activity Map

Colors show your progress:

  • Green: High completion
  • Light green: Some habits done
  • Gray: No habits completed

Navigation:

  • Use year selector for different years
  • Tap any square to see that day’s details

πŸš€ Tips for Success

  • Start small - aim for 1 habit per day
  • Be consistent - daily tracking works best
  • Check in daily - same time each day
  • Review weekly - see your patterns

πŸ”„ What’s Coming

Next update:

  • Custom habits
  • Streak counters
  • Goal setting
  • Notifications

Future:

  • Dark mode
  • Widgets
  • Data export
  • Cloud sync

❓ FAQ

Is it free? Yes, completely free.

Need internet? No, works offline.

Custom habits? Coming in next update.

Sync between devices? Not yet, planned for future.

What iOS version? iOS 15.0 or later.

Works on iPad? Yes, same features.

Data export? Coming soon.

Requirements: iOS 15.0+ β€’ iPhone/iPad β€’ 50MB storage

LifePixel - Build your life pixel by pixel ❀️

Knowledge Planet PDF Downloader

🌐 Knowledge Planet PDF Downloader

Chrome Extension for Knowledge Planet (ηŸ₯θ―†ζ˜Ÿηƒ) PDF Downloads

πŸ“₯ What It Does

Automatically download PDFs from Knowledge Planet (ηŸ₯θ―†ζ˜Ÿηƒ), a knowledge sharing community where users share business analysis PDFs daily.

Key Features:

  • 🎯 One-click download of all PDFs from today or past X days
  • πŸ“Š Smart filtering - only downloads PDFs that have been downloaded 5+ times
  • πŸ“… Custom date range - download since a specific starting date
  • πŸ‡¨πŸ‡³ Bilingual support - English and Chinese interface

πŸ›  How to Use

  1. Install from Chrome Web Store
  2. Navigate to Knowledge Planet (wx.zsxq.com)
  3. Click the extension icon
  4. Select date range or use β€œtoday”
  5. Download all PDFs with one click

πŸ”’ Privacy & Security

  • βœ… No data collection - extension doesn’t store or share your data
  • βœ… Local processing - all downloads happen directly to your device
  • βœ… Minimal permissions - only accesses Knowledge Planet website
  • βœ… Open source approach - transparent functionality

πŸ’‘ Perfect For

  • Researchers tracking business trends
  • Analysts collecting market reports
  • Students gathering educational materials
  • Professionals staying updated with industry insights

πŸ“‹ Requirements

  • Chrome browser (or Chromium-based browsers)
  • Knowledge Planet account access
  • Active community with PDF sharing

πŸ”„ Recent Updates

v1.1.1 (August 2025)

  • Changed popup language to Chinese
  • Improved user interface

v1.1.0

  • Added custom starting date feature
  • Enhanced download filtering

Size: 21.71KB β€’ Languages: English, Chinese β€’ Users: Growing community

Install from Chrome Web Store β†’

πŸš€ More Products Coming Soon

I’m constantly building new tools and apps to solve everyday problems. Check back here for updates on new releases!

Upcoming:

  • Web productivity tools
  • Developer utilities
  • More mobile apps

Have an idea for a product? Email me - I’d love to hear from you!