If you already own an iPad, the question is obvious: why would you buy a portable monitor when you can just use the iPad as a second screen?
It is a fair question. Apple's Sidecar feature turns any modern iPad into a wireless (or wired) second display for your Mac. It is free. It works. And you already have the hardware.
But after using both setups extensively while working remotely, the answer is more nuanced than "just use your iPad." Here is an honest breakdown of where each option wins and where each falls short.
How the iPad Works as a Second Screen
Apple's Sidecar lets you extend or mirror your Mac's display to an iPad. You can connect wirelessly or with a USB cable. Once connected, the iPad acts as a standard external display. You can drag windows to it, use it in landscape or portrait mode, and even use the Apple Pencil for markup.
Universal Control goes a step further, letting you use your Mac's keyboard and trackpad across both screens seamlessly, and even drag files between devices.
On paper, this sounds perfect. In practice, there are some real limitations.
Screen Size
This is the most straightforward comparison. The iPad Air has a 10.9 inch screen. The iPad Pro goes up to 13 inches. A typical portable monitor is 14 to 16 inches.
That size difference matters more than you might expect. On a 10.9 inch iPad, fitting two windows side by side is uncomfortable. The text is too small to read without leaning in. Even the 13 inch iPad Pro feels cramped compared to a 14 inch portable monitor, because the iPad's rounded corners and thicker bezels reduce the usable display area.
If you are using your second screen for reference material, keeping Slack open, monitoring email, or following a tutorial, the iPad's size is workable. But if you need to actively work on the second screen, editing documents, reviewing designs, or writing code, the smaller display becomes a limitation.
Reliability and Latency
This is where the gap widens significantly.
Sidecar over Wi-Fi introduces noticeable latency. Moving your cursor from the Mac to the iPad has a slight delay. Dragging windows feels sluggish. Scrolling on the iPad screen is not as responsive as on a native display. It works, but it never feels seamless.
Wired Sidecar (USB-C cable) is better. The latency drops and the experience feels closer to a native monitor. But you are now using a cable anyway, which removes the "wireless convenience" advantage.
A dedicated portable monitor connected via USB-C has zero perceptible latency. It behaves exactly like a normal external display because that is exactly what it is. There is no software layer interpreting the signal. Your laptop sees it as a standard monitor.
If you have ever been frustrated by the slight lag of Sidecar, this alone is reason enough to consider a portable monitor.
The "Dedicated Device" Problem
Here is the issue nobody talks about: when your iPad is being used as a second screen, it stops being an iPad.
You cannot check iMessages on it. You cannot quickly open Safari to look something up. You cannot use your iPad apps. It is fully occupied as a display. If a notification comes in that you want to respond to, you have to disconnect Sidecar, use the iPad, and reconnect.
This creates an annoying workflow interruption. You bought the iPad to be a versatile device, and Sidecar turns it into a single purpose monitor, but a worse one than an actual monitor.
A portable monitor, by contrast, is a dedicated display. That is its only job, and it does that job perfectly. Your iPad remains free to be an iPad, for notes, sketches, reading, or whatever else you use it for.
If you own both an iPad and a portable monitor, you actually get three screens: your laptop, the monitor, and the iPad doing its own thing. That is a better setup than sacrificing your iPad to act as a subpar display.
Ergonomics
Most people use Sidecar with their iPad lying flat on the desk (in the Apple keyboard case) or propped up at a shallow angle. This creates a poor ergonomic setup. You are looking down at the iPad, which strains your neck over long work sessions.
Portable monitors with a folio case or stand can be positioned at eye level or at least at a comfortable angle. Some models support both landscape and portrait orientation, which is useful for reading documents or coding.
The ergonomic difference is subtle but matters if you are using the second screen for more than an hour at a time. Neck strain from looking down at a flat iPad accumulates over weeks and months.
Resolution and Display Quality
This is one area where the iPad genuinely wins, for now.
The iPad Pro's Liquid Retina XDR display is exceptional. High brightness, true blacks (on the OLED models), ProMotion 120Hz, and outstanding colour accuracy. No portable monitor under £300 can match this display quality.
However, for productivity work, documents, spreadsheets, email, Slack, code editors, the display quality difference is barely noticeable. You are looking at text and UI elements, not editing photos or grading video. A QHD portable monitor provides perfectly sharp text and accurate colours for everything a remote worker does daily.
Display quality matters for creative professionals. For everyone else, it is not a meaningful differentiator in the Sidecar vs portable monitor debate.
Compatibility
Sidecar only works with macOS and iPadOS. If you use a Windows laptop, a Chromebook, or need to connect to a gaming console, Sidecar is not an option.
A portable monitor works with everything. MacBook, Windows laptop, Chromebook, Nintendo Switch, Steam Deck, PlayStation, Xbox. Anything with a USB-C or HDMI output. If you switch between devices or want the flexibility to use your second screen with anything, a dedicated monitor is the only choice.
Cost
If you already own an iPad, Sidecar is free. That is a genuine advantage.
But if you are considering buying an iPad specifically to use as a second screen, the maths changes dramatically. An iPad Air starts at £599. An iPad Pro starts at £999. A quality portable monitor costs £150 to £300.
Buying an iPad as a second screen is like buying a Swiss Army knife to use as a screwdriver. It works, but you are paying for a lot of functionality you are not using in that moment.
The Verdict
Use your iPad as a second screen if: you already own one, you only need a second screen occasionally (not daily), you do not mind the latency and size limitations, and you primarily use it for low interaction tasks like keeping Slack or email visible.
Buy a portable monitor if: you need a second screen daily, you want zero latency performance, you value having your iPad free for other tasks, you use a Windows laptop or multiple devices, or you want a larger display that sets up in seconds.
For most remote workers who use a second screen as a core part of their workflow, not an occasional convenience, a dedicated portable monitor is the better investment. It does one thing, and it does it properly.
The iPad is a brilliant device. But "brilliant at everything" does not mean "best at this specific thing."
Want a second screen that is purpose built for daily remote work? Check out the Ekran Lite & Pro, portable monitors with a single cable setup that deploys in 10 seconds.
