Guide

Tired of hunting for a KVM switch that supports your ports?

A KVM switch for two computers sounds simple: one box, two inputs, one monitor. Then you open the spec sheet. This page covers what goes wrong with hardware KVMs, and the software route that uses the two inputs your monitor already has.

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The port-matching problem

A hardware KVM has to pass video through unchanged. So every port on the box must match what your computers put out and what your monitor takes in. HDMI 2.0 and HDMI 2.1 look identical from the outside and carry very different bandwidth. DisplayPort 1.2, 1.4, and 2.0 are the same story. A switch listed as "4K" often means 4K at 60 Hz on one port and 1080p on the other.

Add a laptop and the list grows. If it connects over USB-C, the switch has to pass video, USB data, and power delivery at a wattage that will not throttle the machine. Then come the cables. A KVM adds a second cable run between each computer and the monitor, and a cheap or overlong cable drops you below the refresh rate you paid for.

For a KVM switch with 4K 144Hz on both inputs the shopping list is short and the boxes sit at the top of the $80 to $400 range. One wrong spec and you are packing it up for a return.

USB re-enumeration on cheap units

Most KVM switches share USB by physically disconnecting your peripherals from one computer and connecting them to the other. To the operating system that is an unplug and a replug. Every switch, every device starts over.

In practice: a USB DAC pops or resets its volume. A gamepad drops out of the game. A security key forgets it was inserted. A webcam re-initializes and the call freezes for a second. Better switches keep some devices powered across the flip, but that is a feature you pay extra for, and the spec sheet rarely says which devices survive.

Desk clutter and the price ladder

A two-computer KVM means the box, two video cables in, one out, two USB uplinks, and a power brick. That is six or seven cables on a desk that had three.

Prices climb with resolution and refresh rate. A switch that handles 1440p or 4K at high refresh runs $80 to $400, and the cheaper units in that range usually cap at 1080p or 60 Hz on at least one port. One that handles a Mac over USB-C and a PC over DisplayPort at the same time sits at the expensive end. And a hardware KVM cannot be updated. When your next monitor needs a newer port version, you buy a new switch.

The software answer: your monitor already has two inputs

Look at the back of your monitor. It almost certainly has two or more inputs: HDMI and DisplayPort, or USB-C and HDMI. Plug computer one into one input and computer two into the other. That is the video half of a KVM, and it costs nothing. Each computer drives the monitor directly, at whatever resolution and refresh rate your monitor and cable support. There is no box in the signal path to cap it.

What is missing is the switch. Most monitors made after about 2015 support DDC/CI, a VESA standard that lets software send commands to the monitor over the video cable. One of those commands is "change input." EasyKVM sends it when you press a hotkey. Our DDC/CI guide explains the mechanism.

The keyboard and mouse half works over your LAN. Your keyboard and mouse stay plugged into one computer, the host. Press Ctrl+Alt+Q: the monitor flips input, and your keystrokes and mouse movement are forwarded to the other computer over the local network. Press it again to come back. Clipboard and system audio follow the same way. Nothing is unplugged, so nothing re-enumerates. Your DAC does not pop. Input latency is under 50 ms on a typical LAN, and there is no pixel streaming, so the picture is the monitor's native output rather than a compressed video feed.

EasyKVM runs on macOS 13+ and Windows 10/11, so it covers the Mac and PC desk that hardware KVMs struggle with. Either machine can be the host. It costs $29.99 once for both platforms, with a 3-day full trial and no card up front. If you run two or three monitors, add them in Settings and they all swap on the same hotkey.

Hardware KVM vs software KVM

	EasyKVM	Hardware KVM
Video path	Direct, each computer on its own input	Through the box
Port matching	None	Every port must match computers and monitor
4K 144 Hz, HDR	Whatever your monitor and cable support	Only on the expensive units
USB devices on switch	Stay connected	Re-enumerate on cheap units
Cables on the desk	Your existing ones	Six or more, plus a power brick
Mac and PC	Yes, macOS 13+ and Windows 10/11	Depends on the port mix
Price	$29.99 once	$80 – $400
Updates	Included	None, buy a new box
Requires	DDC/CI monitor, LAN, a Windows machine in the pair	Matching ports on everything

What you need, honestly

A monitor with DDC/CI input switching. Most made after 2015 have it, but some ignore the input-switch command even when other DDC/CI controls work. The trial tells you in minutes. The troubleshooting page covers the common failure modes.
A Windows machine in the pair. EasyKVM sends the DDC/CI command from Windows. A Mac and a PC, or two PCs, swap the monitor automatically. Two Macs share keyboard, mouse, clipboard, and audio, but you change the input yourself.
Keyboard and mouse plugged into the host. The other computer receives input over the LAN, so it needs nothing plugged in. The joiner needs no license either.
Both computers on the same LAN. Wi-Fi works. Wired is snappier.
Beta software. The apps are not code-signed yet, so the first launch shows an OS warning. The download page walks through it.

Considering remote desktop instead? TeamViewer, Parsec, and RDP can reach the second computer too, but they stream a compressed picture through a relay. Read KVM vs remote desktop before you decide. And if you use Synergy or Mouse Without Borders today, see hotkey vs mouse-edge switching. Working from home with a company laptop and your own desktop? See work laptop and personal computer on one monitor.

FAQ

Do I still need a KVM switch if I use EasyKVM?

No. Your monitor's built-in inputs replace the video switch, and your LAN replaces the USB switch. Each computer connects to the monitor on its own cable, and EasyKVM tells the monitor which input to show. Keyboard and mouse stay plugged into one computer and are forwarded to the other over the network.

Does EasyKVM work for 4K at 144 Hz?

Yes, if your monitor and cable do. EasyKVM never touches the video signal. Each computer drives the monitor directly on its own input, so you get whatever that connection supports, including HDR and high refresh rates. There is no box in the signal path to cap it.

Can I use a KVM switch with a Mac and a PC?

A hardware KVM can, if you find one whose ports match both machines, and USB-C Macs make that harder. EasyKVM runs on macOS 13+ and Windows 10/11 and needs no port matching. The Windows machine in the pair sends the DDC/CI input-switch command for both sides. Setup steps are in control a Mac and a PC with one keyboard.

What if my monitor doesn't support DDC/CI?

Then the automatic input flip will not work on that monitor, and the 3-day trial shows you that before you pay. You can still use EasyKVM to share keyboard, mouse, clipboard, and audio, and change the input with the monitor's own buttons. There is also a 14-day refund.

Try it before you buy a box

The trial is three days, full functionality, no card. It tells you whether your monitor accepts the DDC/CI input switch before you spend anything. If it does not, you have lost nothing but ten minutes.

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