The second display you already own.

Cablecar turns the Mac beside you into a wired second display, over the Thunderbolt cable already in your drawer. No dongle to buy, no Wi‑Fi lag to forgive.

Download for Mac Coming soon · Apple silicon
A MacBook Pro and a MacBook Air joined by one Thunderbolt cable, with a single window spanning both screens as one extended desktop. SENDS CABLECAR · AIR PRESENTS ONE CABLE · ONE DESKTOP

How it works

Plug in

The Thunderbolt or USB4 cable you already own, straight between the two Macs. No dongle, no adapter, nothing to buy.

Open Cablecar

Once on each Mac. They find each other over the cable — no account, no pairing codes, no settings to hunt through.

Drag a window across

The second Mac is just another display — sharp, instant, and silent. Everything behaves the way a plugged-in monitor does.

Measured, not promised

Screen to screen in 7.4 milliseconds — measured on real hardware, not quoted from a datasheet. You will not feel it.

One frame · 16.7 ms 44% max per frame
CAPTURE 1.5 ENCODE 2.6 WIRE 0.9 DECODE 2.4 TOTAL 7.4 MS

Measured on a MacBook Pro M4 Pro sending to a fanless MacBook Air M3, over one Thunderbolt cable.

Specs

Latency 7.4 ms — screen to screen, measured
Picture 4:4:4 — every pixel, full colour
Rate 60 Hz — smooth as a plugged-in monitor
Codec ProRes 4444 — hardware, both ends
Connection Thunderbolt / USB4 — the cable is the whole setup
Heat Runs cool — even on a fanless MacBook Air

Requires Apple silicon with hardware ProRes on both Macs, and the Thunderbolt or USB4 cable between them. That’s the whole shopping list.

Plug in the cable. Keep the drawer money.

Download for Mac Coming soon · Apple silicon