ezku.link

Ultra-Fast macOS Screen Mirroring & 4K Smart TV Streaming

ezku.link is a native macOS menu bar utility engineered exclusively for Apple Silicon and macOS. Designed to live silently in your top menu bar (NSStatusItem) with zero dock clutter (LSUIElement), ezku.link lets you broadcast your screen, app windows, or local 4K video files to any Smart TV or web browser in 1 click with sub-30ms ultra-low latency.

Website • Features • Installation • Usage Guide • Architecture • App Store Metadata • Support

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✨ Key Features

📺 1. Smart TV Direct Casting (Google Cast & DLNA)

• Automatic Device Discovery: Instant mDNS/SSDP background scanner discovers Smart TVs on your local Wi-Fi.
• Universal TV Compatibility: Works out of the box with:
  • Chromecast & Google TV (Sony Bravia, Chromecast with Google TV, Android TV, Google Cast devices)
  • DLNA / UPnP Media Renderers (Samsung Tizen, LG webOS, Roku TV, Panasonic, Philips, etc.)
• No Third-Party TV Apps: Connects directly over your local network using native TV protocols—no TV app installation required.

🖥️ 2. Virtual Extended Screen (TV as 2nd Monitor)

• True Extended Desktop: Turn any Smart TV or browser into a wireless second monitor for your Mac.
• Full macOS Desktop Integration: Drag app windows, browser tabs, or code editors off the edge of your Mac screen directly onto the TV. Supports Mission Control, Spaces, and arrangement in macOS System Settings.
• Custom Resolutions: Choose between 1080p FHD, 1440p QHD, or 4K UHD at smooth 60 FPS.
• Zero Drivers & Zero Reboot: Operates in user space using Apple's virtual display pipeline—no kernel extensions, no kexts, no permissions hurdles, and automatic window restoration when disconnected.

🌐 3. Zero-Client Web Streaming (ezku.link)

• Watch Anywhere: Anyone on your Wi-Fi (iPhone, iPad, Android phone, Windows PC, Linux, or TV web browsers) can watch your screen simply by scanning the built-in QR Code or navigating to your Mac's local URL.
• Zero Installs for Viewers: Pure HTML5 Canvas & Web Audio API receiver client—no plugins, extensions, or downloads needed.
• TV Browser Mode (/tv): Tailored 10-foot UI with remote control friendly audio activation and automatic fullscreen.

🎬 4. Direct 4K Video Cast

• Dedicated Media Player: Switch from screen mirroring to streaming local video files (.mp4, .mov, .m4v, .mkv).
• HTTP Byte-Range Streaming: Enables smooth scrubbing, seeking, and instant playback on Smart TVs and web browsers without taxing your Mac CPU.

⚡ 5. Apple Silicon Hardware Acceleration

• Capture: Apple ScreenCaptureKit for zero-copy GPU frame acquisition (IOSurface / CVPixelBuffer).
• Encoding: Metal-accelerated GPU compression pipeline (CIContext on Metal) with sub-3ms frame encode duration.
• Ultra-Low Latency: End-to-end latency of ~15–30ms on local Wi-Fi at 60 FPS.
• System Audio Loopback: High-fidelity system audio capture synchronized with video playback.

🎛 6. Sleek macOS Menu Bar Interface

• Zero Dock Clutter: Lives quietly in the macOS menu bar.
• Dynamic Status Indicator: Live pulsing indicator showing active broadcast state.
• Real-Time Telemetry HUD: Monitor FPS, output bitrate (Mbps), encode latency (ms), and active viewer count.
• Quality Presets:
  • Ultra 60 FPS: Optimized scaling for gaming and real-time interaction.
  • Retina Native: 100% native resolution for crisp text and coding.
  • Battery Saver: 30 FPS adaptive compression for mobile laptop use.

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🚀 Installation & Quick Start

Option 1: Homebrew (Recommended)

brew install --cask ezku-link

To update to the latest version:

brew upgrade ezku-link

To uninstall:

brew uninstall ezku-link

Option 2: Download Pre-Built DMG

1. Download the latest release from GitHub Releases:
   • ezku.link.dmg: Official macOS drag-and-drop installer.
   • ezku.link-macOS.zip: Standalone application archive.
2. Open ezku.link.dmg and drag ezku.link into Applications.
3. Launch ezku.link from Spotlight or Applications.

Note: If macOS shows a security warning, go to System Settings → Privacy & Security and click "Open Anyway".

Option 3: Build & Run from Source

Prerequisites: macOS 14.0+ on Apple Silicon (M1/M2/M3/M4), Xcode Command Line Tools (xcode-select --install).

# 1. Clone repository
git clone https://github.com/rinturaj/ezku.link.git
cd ezku.link

# 2. Build the native macOS bundle
./Scripts/build_app.sh

# 3. Package as macOS .dmg Installer (Optional)
./Scripts/build_dmg.sh

# 4. Launch ezku.link in your menu bar
open "build/ezku.link.app"

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📖 Usage Guide

1. Click the Menu Bar Icon: Click the screen cast icon in the top-right macOS menu bar to reveal the popover.
2. Grant Screen Recording Permission: On first launch, grant Screen Recording permission in System Settings > Privacy & Security > Screen & System Audio Recording.
3. Select Mode:
   • Screen Mirror: Cast your entire Mac display or a specific app window.
   • Video Cast: Drag & drop or browse for a local video file to stream in high resolution.
4. Choose Destination:
   • Click "Mirror to TV" to broadcast to your discovered Smart TV.
   • Click "Copy Link" or display the QR Code to share with phones, tablets, or computers on your Wi-Fi.

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🏷 App Store Metadata & Tags

Use the following curated metadata for publishing on the Mac App Store or product directories:

Field	Content
App Name	ezku.link
Subtitle	Cast Screen to Smart TV & Web (29 chars)
Bundle Identifier	link.ezku.mac
Primary Category	Utilities
Secondary Category	Video / Productivity
Copyright	© 2026 ezku.link (https://ezku.link)
Support URL	https://ezku.link
Marketing URL	https://ezku.link

Search Keywords & Tags (App Store 100-Char Limit)

screen mirror,smart tv,cast,chromecast,dlna,airplay,samsung tv,lg tv,stream,display,mac mirror,web cast

Extended SEO Tags & Keywords

ezku.link, ezku link, mac screen mirror, cast mac to smart tv, chromecast mac, dlna streamer, samsung tv cast, lg webos mirror, sony bravia cast, roku screen mirror, mac menu bar utility, screen capture kit, low latency screen share, stream mac to browser, wireless display mac, apple silicon streaming.

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🏗 Technical Architecture

High-Performance Hardware Streaming Pipeline

ezku.link operates fully in user space with zero kernel extensions or third-party dependencies, leveraging native Apple Silicon GPU and networking APIs:

┌────────────────────────────────────────────────────────────────────────┐
│                        macOS WindowServer                              │
└───────────────────────────────────┬────────────────────────────────────┘
                                    │ ScreenCaptureKit (Zero-Copy Frame Acquisition)
                                    ▼
┌────────────────────────────────────────────────────────────────────────┐
│              HardwareVideoEncoder (Metal GPU Pipeline)                 │
│  - CIContext GPU frame processing on Apple Silicon                     │
│  - Dynamic quality presets (Ultra 60 FPS, Retina Native, Battery Saver)│
│  - Real-time telemetry HUD (FPS, Bitrate, Sub-3ms Encode Latency)      │
└───────────────────┬────────────────────────────────┬───────────────────┘
                    │                                │
         AVTransport SOAP (DLNA)             Protobuf Socket (Cast V2)
                    ▼                                ▼
       ┌────────────────────────┐      ┌─────────────────────────┐
       │ Smart TVs (Samsung, LG)│      │ Chromecast & Google TV  │
       └────────────────────────┘      └─────────────────────────┘
                    ▲
                    │ HTTP Byte-Range / WebSocket (Network.framework)
       ┌────────────┴───────────┐
       │ Web Receivers (Canvas) │ (iPhone, iPad, PC, Android, Mac)
       └────────────────────────┘

Directory Structure

EzkuLink/
├── Package.swift                  # Swift Package Manager (macOS 14+, Swift 6.0+)
├── Resources/
│   ├── Info.plist                # CFBundleName = ezku.link, permissions
│   ├── EzkuLink.entitlements     # Network server & client entitlements
│   └── AppIcon.icns              # Multi-resolution macOS icon assets
├── Scripts/
│   ├── build_app.sh              # Compiles and packages into native ezku.link.app
│   ├── build_dmg.sh              # Packages signed macOS installer .dmg
│   └── generate_dmg_background.swift # Custom DMG drag-and-drop artwork generator
├── Sources/EzkuLink/
│   ├── main.swift                # App entry point
│   ├── App/
│   │   └── AppDelegate.swift     # Accessory policy & lifecycle
│   ├── Capture/
│   │   ├── ScreenCaptureEngine.swift # Apple ScreenCaptureKit screen & audio engine
│   │   └── VirtualDisplayManager.swift # User-space Virtual 2nd Display Engine
│   ├── Encoder/
│   │   └── HardwareVideoEncoder.swift # Metal GPU acceleration & telemetry
│   ├── Server/
│   │   ├── StreamingServer.swift  # Apple Network.framework HTTP & WebSocket server
│   │   └── WebClientAssets.swift  # Zero-latency HTML5 / Canvas / WebAudio web client
│   ├── TV/
│   │   ├── SmartTVDiscovery.swift # mDNS / SSDP TV scanner
│   │   ├── GoogleCastController.swift # Google Cast / Chromecast V2 protocol
│   │   └── DLNAController.swift   # UPnP / DLNA AVTransport SOAP controller
│   ├── UI/
│   │   ├── MenuBarController.swift # NSStatusItem controller
│   │   ├── MenuBarPopoverView.swift # SwiftUI popover UI with TV list & QR code
│   │   ├── VisualStyles.swift     # Liquid glass cards & button styles
│   │   └── WelcomeOnboardingWindow.swift # User onboarding & quick start guide
│   └── Utils/
│       ├── NetworkUtils.swift     # Local IP detection & QR generator
│       └── PermissionManager.swift# Screen recording permission helper
└── Tests/EzkuLinkTests/           # Comprehensive Swift Testing suite

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☕ Support & Community

If you find ezku.link useful, consider supporting future development:

• Website: https://ezku.link
• Buy Me a Coffee: buymeacoffee.com/rin2

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📄 License

All rights reserved © 2026 ezku.link (https://ezku.link).