🌐 中文版 README

A Comprehensive Network Diagnostics & Utility Toolkit for Android

---

⚠️ IMPORTANT: If you use this repository, you MUST keep all author attribution intact. DO NOT REMOVE the author credits. See License & Attribution for details.

Copyright © 2024 Khoo Lay Yang - All Rights Reserved

CV Toolkit is a professional-grade, all-in-one Android application designed for network diagnostics, cloud infrastructure monitoring, system information, and a comprehensive suite of developer utilities. Built with modern Android technologies (Kotlin 2.3.20 + Jetpack Compose), it delivers 64 powerful tools across 67 screens in one beautifully designed app.

Perfect for:

• 👨‍💻 Network Administrators - Comprehensive network diagnostics and monitoring
• 🌐 Cloud Engineers - Test connectivity to 311+ regions across 14 cloud providers with real-time graphs
• 🔐 Security Professionals - Port scanning, SSL checking, and security analysis tools
• 💻 Software Developers - Encoding, hashing, JWT decoding, and development utilities
• 🎓 Students & Educators - Learn networking concepts with hands-on tools
• 🏠 Home Users - Troubleshoot network issues and monitor your connection

Why CV Toolkit?

• ✅ All processing is done 100% locally on your device
• ✅ Your data never leaves your phone - complete privacy guaranteed
• ✅ No registration or account required
• ✅ Works offline for most tools (network tools require connectivity)
• ✅ Professional-grade accuracy and performance
• ✅ Beautiful, modern Material Design 3 interface
• ✅ Regular updates with new features and improvements

The crown jewel of CV Toolkit - a professional-grade network monitoring tool featuring:

• Real-time line graphs with multi-region visualization
• Continuous monitoring with configurable intervals (1s/2s/5s)
• Comprehensive statistics: Min, Max, Avg, Jitter, and Packet Loss tracking
• 311+ test regions across 14 global cloud providers
• Monitor 35+ regions simultaneously with color-coded tracking
• Edge location detection for Cloudflare, CloudFront, and Alibaba Cloud
• Background service support for uninterrupted monitoring

Everything you need for network diagnostics, development, PDF management, code editing, and system analysis in one app.

• Zero data collection
• No server uploads
• 100% local processing
• Open and transparent

• Speed Test - Comprehensive internet speed testing with download/upload speeds, ping latency, jitter measurement, and historical tracking. Foreground service support for uninterrupted testing
• Ping Test - ICMP ping testing with packet count configuration, timeout settings, and detailed statistics (min/max/avg/packet loss)
• Continuous Ping - Multi-host real-time ping monitoring with live line graphs, color-coded per host, for ongoing connectivity analysis
• Traceroute - Visual network path tracing showing all hops with latency measurements and geographic information
• Port Scanner - Scan for open ports on any host with service detection and parallel scanning
• Network Scanner (Device Discovery) - Discover all devices connected to your network with MAC address lookup and manufacturer identification
• IP Lookup - Get detailed geolocation, ISP, security flags (VPN/proxy/TOR detection), and carrier information for any IP address with local history
• DNS Lookup - Comprehensive DNS record querying (A, AAAA, CNAME, MX, TXT, NS, SOA, PTR) with custom DNS server support and response time tracking
• Subnet Calculator - Advanced IPv4/IPv6 subnet calculations with CIDR notation, network/broadcast addresses, usable host range, and subnet mask conversion
• SSL/TLS Checker - Detailed SSL certificate inspection including validity period, issuer information, subject details, certificate chain, encryption algorithms, and expiration warnings
• Whois Lookup - Get domain registration information
• HTTP Headers Viewer - Inspect HTTP response headers
• Custom Request Builder - Build and send custom HTTP/CURL requests with headers and body
• WiFi Analyzer - Analyze WiFi signal strength, channels, and network details
• DNS Benchmark - Compare response times across 10 popular DNS providers (Google, Cloudflare, Quad9, OpenDNS, AdGuard, etc.) with bar chart visualization, sorting by speed/name/reliability, configurable query count, and detailed min/max/avg statistics
• CDN & Cloud Latency Test - Real-time monitoring with live graphs - Test latency to 311+ regions across 14 major providers with continuous ping, multi-region tracking, detailed statistics (min/max/avg/jitter/packet loss), automatic edge detection, and color-coded line charts:
  • AWS (Amazon Web Services)
  • GCP (Google Cloud Platform)
  • Azure (Microsoft Azure)
  • Oracle Cloud
  • Alibaba Cloud
  • DigitalOcean
  • Linode (Akamai)
  • Vultr
  • Hetzner
  • OVH
  • Tencent Cloud
  • Huawei Cloud
  • Lightsail
  • Fastly

🔄 Encoders & Decoders (8 tools):

• JSON Formatter/Validator - Format, minify, and validate JSON with syntax highlighting, statistics (key/value counts, depth, types), configurable indentation, and one-tap copy
• Base64 Encoder/Decoder - Encode and decode Base64 strings
• URL Encoder/Decoder - Encode and decode URL strings
• Binary Converter - Convert text to/from Binary, Hex, and Octal
• Hex Encoder/Decoder - Convert text to/from hexadecimal
• ASCII Converter - Convert text to ASCII values and vice versa
• JWT Decoder - Decode and inspect JWT tokens
• Image Base64 - Convert images to/from Base64 encoding

🔐 Security & Crypto (6 tools):

• Hash Generator - Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512 hashes
• Caesar Cipher - Encrypt/decrypt with Caesar cipher, ROT13, ROT47
• Morse Code Converter - Convert text to Morse code and back
• Password Generator - Generate strong, secure passwords with customizable options
• Password Strength Checker - Analyze password entropy, character composition, crack time estimation, detect common patterns/sequences, and provide detailed security checks with visual strength meter
• File Hash Calculator - Calculate MD5, SHA, CRC32 hashes for files with metadata

📱 QR & Barcode (3 tools):

• QR Code Generator - Generate QR codes from text, URLs, contacts, etc.
• Barcode Generator - Generate various barcode formats (EAN, UPC, Code 128, etc.)
• QR/Barcode Scanner - Scan and decode QR codes and barcodes with camera

🌐 Web & API (4 tools):

• API Tester - Save, organize, and execute API requests with custom headers and body
• User Agent Parser - Parse and analyze browser User-Agent strings
• Robots.txt Analyzer - Fetch and parse robots.txt files from any domain
• Sitemap Viewer - Parse and browse XML sitemaps

📄 PDF & Documents (5 tools):

• PDF Viewer - View and navigate PDF documents
• PDF Merge - Combine multiple PDF files into one with multi-select import, drag-to-reorder, and full page preview before saving
• Image to PDF - Convert images to PDF with multi-select import, drag-to-reorder, page size/orientation/margin/fit settings, and full page preview before export
• Compress PDF - Reduce PDF file size
• Slides to PDF - Convert presentation slides (PPT) to PDF

✏️ Editors (4 tools):

• Text Editor - Create and edit text files on device
• Markdown Editor - Write markdown with live preview
• Markdown Preview - Render and preview markdown content
• SVG Viewer & Editor - View and edit SVG vector graphics

🎨 Media & Colors (3 tools):

• Compress Image - Reduce image file size while maintaining quality
• Color Converter - Convert between HEX, RGB, HSL, and CMYK color formats
• Color Palette Generator - Generate and explore color palettes

🔢 Converters & Calculators (5 tools):

• IP Calculator - Convert between different IP formats
• Unit Converter - Convert length, weight, temperature, and data sizes
• World Time - View current time across global time zones
• Unix Timestamp Converter - Convert between Unix timestamps and readable dates
• UUID Generator - Generate UUID v1, v4, and v5

📝 Text & Misc (5 tools):

• Text Counter - Count words, characters, lines, and paragraphs
• Text Diff - Compare two texts and highlight differences
• Lorem Ipsum Generator - Generate placeholder text for design and development
• Typing Test - Practice and measure typing speed (WPM) and accuracy with 2,300+ unique content pieces across 25+ topics. Features 3 modes (Words/Sentences/Paragraphs), 3 difficulty levels, configurable duration (30s/60s/120s/Full Text), real-time stats, and repeat/new test options. Every session generates a unique random combination
• Stopwatch - Timer with lap functionality

• Device Information - Complete system information (CPU, RAM, storage, OS, etc.)
• DRM & Codec Info - View DRM systems, video/audio codecs, and supported formats
• Camera Information - Detailed camera specifications and capabilities
• Security Audit - Comprehensive device security check and vulnerability assessment
• Sensor Dashboard - Real-time readings from all device sensors (accelerometer, gyroscope, proximity, etc.)

• Language: Kotlin 2.3.20 (100%)
• UI Framework: Jetpack Compose BOM 2026.03.00 (Modern declarative UI with Material Design 3)
• Architecture: MVVM with Repository pattern for clean separation of concerns
• Build System: AGP 9.1.0, Gradle 8.0+, JDK 11+
• Networking:
  • Retrofit 3.0.0 (Type-safe REST API calls)
  • OkHttp 5.3.2 (HTTP client with interceptor support and logging)
  • Gson 2.13.2 (JSON parsing and serialization)
  • Coroutines (Asynchronous programming)
• Camera & ML:
  • CameraX 1.5.3 (Modern camera API with preview and analysis)
  • ML Kit Barcode Scanning 17.3.0 (On-device QR/Barcode recognition)
  • ZXing Core 3.5.4 (QR code and barcode generation)
• Data Visualization:
  • Canvas API (Custom line graphs and charts)
  • Real-time rendering with Compose recomposition
• Background Processing:
  • Foreground Services (Speed tests and continuous monitoring)
  • Coroutines (Parallel processing and async operations)
• Data Persistence:
  • SQLite (IP lookup history storage)
  • SharedPreferences (Language settings, ad usage tracking)
• Navigation: Jetpack Navigation Compose 2.9.7 with type-safe sealed class routes (67 destinations)
• Minimum SDK: Android 7.0 (API 24) - Wide device compatibility
• Target SDK: Android 16 (API 36) - Latest Android features
• Compilation SDK: 36 (Android 16)
• Image Loading: Coil 2.7.0 (Efficient image loading with SVG support and caching)
• Monetization: Google AdMob (Non-intrusive banner ads with usage-based interstitial and rewarded ads)

• Material Design 3 - Modern, beautiful interface following Google's latest design guidelines
• Dynamic Theming - Adapts to system theme (Light/Dark mode)
• Responsive Layout - Optimized for all screen sizes and orientations
• Smooth Animations - Polished transitions and interactions
• Color-Coded Indicators - Visual feedback for latency quality and status
• Real-time Updates - Live data visualization without page refreshes
• Provider Logos - Visual identification with official brand logos
• Intuitive Navigation - Easy-to-use interface with logical organization
• Copy & Share - One-tap actions for results and data
• Search & Filter - Quickly find what you need across 311+ regions

CV Toolkit supports 18 languages:

PDF Merge Improvements:

• Multi-select PDF import - select multiple PDFs at once instead of adding one by one
• Drag-to-reorder - long press and drag to rearrange PDF order
• Full page preview - swipe through all pages before saving the merged PDF

Image to PDF Improvements:

• Drag-to-reorder - long press and drag to rearrange image order
• Full page preview - swipe through all pages with settings applied before exporting
• Preview shows all pages (not just the first) with page counter and swipe navigation

The CDN & Cloud Latency Test has been completely redesigned with professional-grade features:

🎯 Real-time Line Graphs

• Multi-color line charts showing latency trends over time
• Support for monitoring 35+ regions simultaneously
• Auto-scaling Y-axis with grid lines
• Time-series X-axis with mm:ss timestamps
• Smooth animations and responsive updates

📊 Continuous Monitoring

• Configurable ping intervals (1s, 2s, or 5s)
• Background service support for uninterrupted testing
• Add/remove regions on-the-fly without stopping monitoring
• Batch monitoring for all regions in a provider

📈 Advanced Statistics

• Per-region statistics cards with color-coded latency badges:
  • 🟢 Green: < 50ms (Excellent)
  • 🟡 Yellow: 50-100ms (Good)
  • 🟠 Orange: 100-200ms (Fair)
  • 🔴 Red: ≥ 200ms (Poor)
• Comprehensive metrics: Sent count, Packet loss %, Min/Max/Avg latency, Jitter
• Historical tracking: Last 30 data points per region
• Graph legend: Color-coded region identification

🌐 Edge Detection

• Automatically detects your CDN edge location
• Shows Cloudflare, CloudFront, and Alibaba Cloud connections
• Visual provider logos for easy identification

✨ UI Improvements

• Provider logos for all 14 cloud providers
• Sort by latency, name, or location
• Search and filter across 311+ regions
• Export results for documentation
• Responsive Material Design 3 interface

[Screenshot 1: Main Screen]  [Screenshot 2: Network Tools]  [Screenshot 3: Utility Tools]

• Android Studio: Meerkat (2024.3) or later recommended
• Android SDK: API 24 (Android 7.0) or higher
• AGP: 9.1.0+
• Kotlin: 2.3.20+
• Gradle: 8.0+
• JDK: Java 11 or higher

1. Clone the repository:

git clone https://github.com/osscv/CV-Toolkit.git
cd CVToolkit

2. Open the project in Android Studio

   • Select "Open an Existing Project"
   • Navigate to the cloned directory
   • Android Studio will automatically detect the project

3. Sync Gradle dependencies

   • Android Studio will prompt to sync
   • Or manually: File → Sync Project with Gradle Files

4. Configure AdMob (Optional)

   • The app includes AdMob integration
   • AdMob ID is in AndroidManifest.xml
   • Replace with your own ID if publishing your own version

5. Build and run

   • Connect your Android device or start an emulator
   • Click Run (▶) or press Shift+F10

Debug Build:

./gradlew assembleDebug

Release Build:

./gradlew assembleRelease

Install on Device:

./gradlew installDebug

Run Tests:

./gradlew test

APK Location:

• Debug: app/build/outputs/apk/debug/app-debug.apk
• Release: app/build/outputs/apk/release/app-release.apk

• Lookup your current IP or any custom IP address
• Get detailed information: location, ISP, ASN, timezone
• History tracking with timestamps stored locally
• Uses dkly DATAHUB API

Comprehensive Provider Coverage:

• 311+ Test Regions across 14 Major Providers:
  • Azure (46 regions)
  • AWS (30+ regions)
  • Google Cloud Platform (40+ regions)
  • Alibaba Cloud (23 regions)
  • Oracle Cloud (20 regions)
  • DigitalOcean (15 regions)
  • Vultr (32 regions)
  • Linode (12 regions)
  • Lightsail (11 regions)
  • Hetzner (6 regions)
  • OVH (17 regions)
  • Fastly (18 regions)
  • Tencent Cloud (15 regions)
  • Huawei Cloud (12 regions)

Edge Location Detection:

• Automatically detects your nearest CDN edge location
• Shows Cloudflare, CloudFront, and Alibaba Cloud edge servers
• Displays real-time connection information

Real-time Monitoring & Graphing:

• Live Line Graph - Visualize latency trends over time with multi-color line charts
• Continuous Ping Mode - Monitor multiple regions simultaneously
• Configurable Intervals - Choose between 1s, 2s, or 5s ping intervals
• Multi-region Tracking - Monitor up to 35+ regions at once with color-coded lines
• Auto-scaling Graph - Dynamic Y-axis scaling based on latency values
• Time-series Display - X-axis shows timestamps with mm:ss format

Detailed Statistics:

• Current Latency - Real-time latency with color indicators (Green < 50ms, Yellow < 100ms, Orange < 200ms, Red ≥ 200ms)
• Min/Max/Avg - Comprehensive latency statistics
• Jitter - Network stability measurement (variance between consecutive pings)
• Packet Loss - Percentage of failed ping attempts
• Sent Count - Total number of ping attempts
• Historical Data - Stores last 30 data points per region

Advanced Features:

• Provider Logos - Visual provider identification with official logos
• Sort Options - Sort by latency, name, or location
• Search & Filter - Quickly find specific regions
• Export Results - Share and save test results
• Add/Remove Monitoring - Dynamically add or remove regions from monitoring
• Background Service - Continue testing even when app is minimized
• Statistics Cards - Individual stat cards for each monitored region with color-coded badges

• Fast Network Scanning - Discover all devices on your local network
• MAC Address Lookup - Identify device manufacturers automatically
• Parallel Scanning - Multi-threaded scanning for faster results
• Device Details - IP address, MAC address, hostname, and manufacturer
• Export Functionality - Save device list for documentation
• Real-time Updates - See devices as they're discovered

• Comprehensive Port Scanning - Scan any port range (1-65535)
• Common Ports Preset - Quick scan of well-known service ports
• Service Detection - Automatic identification of services (HTTP, FTP, SSH, etc.)
• Parallel Scanning - Multi-threaded for faster results
• Timeout Configuration - Adjustable connection timeouts
• Export Results - Save scan reports for security audits

• ML Kit Powered - Google's machine learning for accurate scanning
• Multiple Format Support - QR Code, EAN-8, EAN-13, UPC-A, UPC-E, Code 39, Code 93, Code 128, ITF, Codabar, Aztec, Data Matrix, PDF417
• Real-time Camera Preview - Instant scanning with visual feedback
• Automatic Detection - No need to press buttons, auto-detects codes
• Smart Actions - Automatic URL opening, contact adding, Wi-Fi connecting
• Scan History - Keep track of all scanned codes with timestamps
• Copy to Clipboard - One-tap copy of scanned content
• Flashlight Support - Scan in low-light conditions

1. Network Troubleshooting

   • Use Ping Test to verify host connectivity
   • Run Traceroute to identify routing issues
   • Scan network with Device Discovery to find unauthorized devices
   • Check DNS resolution with DNS Lookup

2. Infrastructure Monitoring

   • Monitor cloud regions with CDN Latency Test's continuous mode
   • Track jitter and packet loss for quality assessment
   • Export results for reports and documentation

3. Security Audits

   • Scan ports to identify exposed services
   • Check SSL certificates for expiration and validity
   • Verify DNS records and configurations

1. Multi-region Latency Testing

   • Test all AWS/Azure/GCP regions simultaneously
   • Compare provider performance from your location
   • Identify optimal regions for deployment

2. Performance Monitoring

   • Set up continuous monitoring for critical regions
   • Track latency trends over time with graphs
   • Analyze jitter and stability metrics

1. API Development

   • Test HTTP headers and responses
   • Build custom HTTP requests with headers
   • Decode JWT tokens for debugging
   • Generate test data (UUIDs, passwords, QR codes)

2. Data Processing

   • Encode/decode Base64 strings
   • Calculate hash values (MD5, SHA)
   • Convert between formats (hex, binary, ASCII)
   • Parse and analyze user agent strings

• Visualize how network routing works (Traceroute)
• Understand DNS resolution process
• Learn about subnet calculations and IP addressing
• Explore different encoding formats
• See real-time network latency across the globe

Your Privacy Matters:

• ✅ All data processing is performed locally on your device
• ✅ No data is uploaded to our servers or any external servers
• ✅ Network scans, device information, and lookup results stay on your phone only
• ✅ IP lookup history is stored locally only
• ✅ No personal data collection, storage, or transmission
• ✅ Open source and transparent

Permissions Used:

• INTERNET - Required for network diagnostics, IP lookups, DNS queries
• ACCESS_NETWORK_STATE - Detect current network configuration
• CAMERA - QR/Barcode scanning and camera info (optional feature)
• FOREGROUND_SERVICE / FOREGROUND_SERVICE_DATA_SYNC - Background speed tests and continuous monitoring
• POST_NOTIFICATIONS - Speed test progress notifications
• ACCESS_WIFI_STATE / CHANGE_WIFI_STATE - WiFi analysis features
• ACCESS_FINE_LOCATION / ACCESS_COARSE_LOCATION - Location-based network features
• REQUEST_IGNORE_BATTERY_OPTIMIZATIONS - Sustained speed testing

Advertising:

• This app displays ads via Google AdMob
• Google may collect data for personalized advertising
• Refer to Google's Privacy Policy for details

This app is designed for legitimate network diagnostics, troubleshooting, and educational purposes only.

Please Note:

• Only use network scanning tools on networks and devices you own or have explicit permission to test
• Unauthorized network scanning or port scanning may be illegal in your jurisdiction
• The app is provided "as is" without warranty
• The developer is not responsible for misuse or any legal issues arising from use of this app

Contributions are welcome! Please feel free to submit a Pull Request.

1. Fork the project
2. Create your feature branch (git checkout -b feature/AmazingFeature)
3. Commit your changes (git commit -m 'Add some AmazingFeature')
4. Push to the branch (git push origin feature/AmazingFeature)
5. Open a Pull Request

By contributing to this project, you agree to:

• Maintain all existing author attributions and copyright notices
• Not remove or modify credits to the original author (Khoo Lay Yang)
• Keep the "About Author" section intact in the application
• Preserve all copyright and attribution information in documentation

All contributions will be reviewed to ensure compliance with these requirements.

Copyright © 2024 Khoo Lay Yang. All Rights Reserved.

This project is proprietary software. Unauthorized copying, distribution, modification, or use of this software is prohibited without explicit permission from the author.

IMPORTANT: If you use, fork, or modify this repository, you MUST:

1. Keep all author attribution intact - Do not remove or modify:

   • The copyright notice "Copyright © 2024 Khoo Lay Yang"
   • Author information (Name: Khoo Lay Yang, Website: www.dkly.net)
   • "Made with ❤️ by Khoo Lay Yang" footer in the README
   • Author credits in the app's "About Author" section

2. Maintain the original author credits in any:

   • Documentation files (README, LICENSE, etc.)
   • Source code headers or comments
   • Application UI/About screens
   • Derivative works or forks

3. Give appropriate credit when:

   • Sharing or distributing the app
   • Creating derivative works
   • Using code snippets or substantial portions
   • Publishing modified versions

Removal or modification of author attribution is strictly prohibited and constitutes a violation of the copyright.

For commercial use, licensing inquiries, or permission requests, please contact: www.dkly.net

Khoo Lay Yang

• Website: www.dkly.net

Feel free to open an issue on GitHub for:

• 🐛 Bug reports
• 💡 Feature requests or suggestions
• ❓ Questions about functionality
• 🔧 Technical issues

• Jetpack Compose - Modern Android UI toolkit
• Retrofit - Type-safe HTTP client
• ZXing - QR code generation
• ML Kit - Barcode scanning
• CameraX - Camera API
• Coil - Image loading with SVG support
• OkHttp - HTTP client
• dkly DATAHUB - IP lookup services
• All cloud providers for their global infrastructure

• 64 Professional Tools organized into 3 categories (9 subcategories) across 67 screens
• 311+ Global Test Regions across 14 cloud/CDN providers
• Real-time Monitoring with live graphs and continuous ping
• Advanced Analytics - Min/Max/Avg/Jitter/Packet Loss tracking
• 100% Local Processing - Your data stays on your device
• Modern UI with Material Design 3 and Jetpack Compose
• Zero Server Dependencies for core functionality
• Multi-region Support - Monitor 35+ regions simultaneously
• Professional Grade - Network diagnostics used by IT professionals
• Privacy First - No data collection, no tracking
• 18 Languages - Global localization support