Turn any device into
a second display.
Use your tablet or another Mac as an extended display for your Mac. Connect via USB-C, WiFi, or Thunderbolt — with full touch and mouse input.
Features
USB-C, WiFi, or Thunderbolt
Connect however you want. USB for the best quality, WiFi for wireless convenience, Thunderbolt for lossless Retina streaming.
Full Touch & Mouse Input
Tap, drag, scroll, and right-click on your tablet or second Mac. Your extended display is fully interactive.
Multi-Device Support
Connect multiple tablets and Macs simultaneously. Each becomes an independent display in macOS Display Settings.
Dual Codec Engine
Lossless LZ4 compression for wired Mac-to-Mac connections. Hardware-accelerated H.265 for WiFi and tablet.
Retina HiDPI
Full Retina resolution over wired connections. Crisp text and sharp UI on your extended display.
60 FPS Streaming
Smooth, real-time screen streaming with backpressure management and hardware acceleration.
How It Works
Install on Mac
Download and install Spantop on your Mac.
Install on Device
Get the tablet app or install Spantop on your second Mac.
Connect
Plug in a USB-C cable or join the same WiFi network.
Extend
Scan for devices, connect, and start using your new display.
Requirements
Mac (Sender)
- macOS 14 (Sonoma) or later
- Apple Silicon or Intel
- USB-C / Thunderbolt / WiFi
Tablet
- A compatible tablet running Spantop
- H.265 hardware decoder
- USB-C cable or WiFi
Pricing
Free
No subscriptions. No accounts. No catch.