Spantop: Laptop Display Extender
Turn any screen into a Mac display.
Spantop lets you turn a spare Mac or Android tablet into a high quality extended display for your Mac over Wi Fi, USB C, or Thunderbolt. Powered by LZ4 compression for near zero latency, it keeps all screen data local to protect your privacy while delivering a smooth experience. As a free alternative to Sidecar, Spantop expands your workspace without requiring additional monitor hardware.