Best all-in-one PCs: tested by experts

One of the best all-in-one PCs is an attractive choice if you work at home and need a computer that's powerful and easy to use, and will also look good.

As the name suggests, all-in-one PCs combine the processor, monitor, keyboard and mouse in a single package. Once you've got it home, all you need to do is unbox, plug in and away you go.

Here we have reviews of popular all-in-one PCs from some of the world's biggest computing brands – including Dell, HP, Lenovo and Apple's iMac. 

We've extensively tested each one for performance, usability, screen and speaker quality, and more. This means you can buy a Which? Best Buy all-in-one PC with confidence, knowing you're getting the best for your budget.

The best all-in-one PCs we tested

Only logged-in Which? members can view our all-in-one PCs test results to discover which we rate as the very best. 

Join Which? to get instant access to our test results and Best Buy all-in-one PC recommendations, below. You will also get instant access to all our online reviews – including laptops and antivirus software.

The all-in-one PCs we tested are listed in alphabetical order below, along with their specs.

Only logged-in Which? members can view our full test results of the best all-in-one PCs.

Join Which? to get instant access to our test results and Best Buy recommendations below.

Acer Aspire C24-195ES

It's available from Acer with an upgraded Intel Core Ultra 7 processor below:

Most recently tested February 2026

Screen size 23.8-inch

Other tech specs Intel Core Ultra 5 125U processor, 8GB Ram, 1TB SSD storage

Need to know Four full-sized USB ports, one USB-C, full-sized HDMI, ethernet, Wi-Fi 6, Full HD display (1,920 x 1,080 resolution), 54 x 22.8 x 51.3cm (WxDxH), 5.2kg, 14 cores (four high performance, 10 efficiency)

Acer Aspire C24-A

Most recently tested February 2026

Screen size 23.8-inch

Other tech specs Intel Core i5-13420H processor, 16GB Ram, 512GB SSD storage

Need to know Six full-sized USB ports, one USB-C, full-sized HDMI, ethernet, Wi-Fi 6, Full HD display (1,920 x 1,080 resolution), 54 x 22.9 x 52.7cm (WxDxH), 6.4kg, eight cores (four high performance, four efficiency)

Acer Aspire C27-B

Most recently tested February 2026

Screen size 27-inch

Other tech specs Intel Core i5-13420H processor, 8GB Ram, 512GB SSD storage

Need to know Five full-sized USB ports, one USB-C, full-sized HDMI, ethernet, Wi-Fi 6, Full HD display (1,920 x 1,080 resolution), 61.1 x 16.5 x 47.6cm (WxDxH), 5.1kg, eight cores (four high performance, four efficiency)

Apple iMac

Most recently tested February 2026

Screen size 24-inch

Other tech specs Apple M4 processor, 16GB Ram, 256GB SSD storage

Need to know No full-sized USB ports, two Thunderbolt ports (USB-C connectors), no HDMI, no ethernet, Wi-Fi 6E, 4.5K Retina display (4,480 x 2,520 resolution), 54.7 x 14.7 x 46.1cm (WxDxH), 5kg, eight cores (four high performance, four efficiency)

Wondering whether you should save money by buying a cheaper Mac mini instead? Find out more in our expert Mac mini review, which includes whether you can use it with a tablet instead of a monitor

Dell 24 All-in-One

Available from Dell (£1,119 – note that this price is for the model with the Intel Core 7 processor. When you click through to Dell, you will initially see the price for the model with the cheaper i5)

Most recently tested February 2026

Screen size 23.8-inch

Other tech specs Intel Core 7 150U processor, 16GB Ram, 1TB SSD storage

Need to know Four full-sized USB ports, two USB-C, full-sized HDMI, ethernet, Wi-Fi 6E, Full HD display (1,920 x 1,080 resolution), 54.1 x 20.1 x 41.4cm (WxDxH), 5.9kg, 10 cores (two high performance, eight efficiency)

Dell 27 All-in-One

Available from Dell (£679)

Most recently tested February 2026

Screen size 27-inch

Other tech specs Intel Core i5-1334U processor, 16GB Ram, 512GB SSD storage

Need to know Four full-sized USB ports, two USB-C, full-sized HDMI, ethernet, Wi-Fi 6E, Full HD display (1,920 x 1,080 resolution), 60.4 x 20.1 x 45.5cm (WxDxH), 6.8kg, 10 cores (two high performance, eight efficiency)

HP OmniStudio X 27-cs0002na

Most recently tested February 2026

Screen size 27-inch

Other tech specs Intel Core Ultra 5 125H processor, 16GB Ram, 1TB SSD storage

Need to know Four full-sized USB ports, two USB-C, full-sized HDMI, ethernet, 3.5mm aux, Wi-Fi 7, 4K UHD display (3,840 x 2,160 resolution), 61.4 x 20 x 53.7cm (WxDxH), 9.3kg, 14 cores (four high performance, 10 efficiency)

Looking for something more portable? See our expert pick of the best laptops 

Lenovo A100

Most recently tested February 2026

Screen size 23.8-inch

Other tech specs Intel Core i3-N305 processor, 8GB Ram, 512GB SSD storage

Need to know Four full-sized USB ports, one USB-C, full-sized HDMI, ethernet, Wi-Fi 6, Full HD display (1,920 x 1,080 resolution), 53.9 x 18.4 x 43.3cm (WxDxH), 4.3kg, six cores (all high performance)

Lenovo IdeaCentre AIO 27ARR9

Available from Argos (£799)

Most recently tested February 2026

Screen size 27-inch

Other tech specs AMD Ryzen 5 753HS processor, 16GB Ram, 1TB SSD storage

Need to know Three full-sized USB ports, one USB-C, full-sized HDMI, ethernet, Wi-Fi 6, Full HD display (1,920 x 1,080 resolution), 61.3 x 19.3 x 48.3cm (WxDxH), 7kg, six cores (all high performance)

How we test all-in-one PCs

Our final test score for each all-in-one is based on dozens of tests – from evaluating the screen and sound quality to measuring the performance through real-life and benchmark testing. 

Speed and performance

• Our real-life testing checks to see how smooth each all-in-one computer is for everyday tasks, such as browsing the web and streaming videos.
• Plus, we use industry-recognised benchmarking to put the PCs through their paces. This gives us a better idea of how well a computer will respond to tougher tasks, such as photo editing and video editing.
• We time how long it takes for each unit to be ready for use after turning it on from cold. We've seen models that take more than 30 seconds, which is a bad sign in terms of general performance.

Comfort and ease of use

• Using an erratic or laggy mouse can be infuriating, so we evaluate the accuracy of the one provided. We consider how comfortable it is in the hand and whether the clicks feel satisfying.
• A good keyboard will be spacious, uncluttered and give decent feedback when you type – we dock marks for keyboards that feel cheaply made and rattle and flex as you use them.
• We also look at the range of ports and connectors provided, as well as how easy they are to access.

Screen quality and sound

• Our expert testing team uses a combination of first-person experience and calibrated screen-analysis equipment to report on how bright, vivid and sharp each display is.
• They also evaluate how well the display holds up when viewed from an angle, and how distracting reflections are when using the computer in a well-lit office.
• An audio expert evaluates the quality of sound when listening through speakers or headphones. They listen out for clarity, volume and depth when giving their ratings.

Key features

• This aspect of the test considers specs such as storage space, amount of short-term memory (Ram) and the number of processor cores. Don't assume that a processor with more cores is better – the number of performance cores is more important than the total number overall (Intel processors include smaller 'efficiency' cores).
• Our features rating doesn't make up a significant portion of the overall score, but we know that the number of full-sized USB or HDMI ports a model has is important (see 'Need to know' in our reviews above and our photos of the back ports. Note that all-in-ones may have additional ports in other places, depending on the model).

Overall Which? test score

To determine our score, we weight each aspect as follows: 40% performance, 20% ease of Use, 24% ecreen and sound quality, 11% features, 5% construction.

Why you can trust us: at Which? we're free from manufacturer and retailer influence. Find out more about our impartiality and how your support helps us to stay editorially independent

What are the disadvantages of all-in-one PCs?

An all-in-one PC gives you a neat home computer that's easy to set up. And, as our expert tests have discovered, there are excellent all-in-one PCs available.

However, it's worth considering these caveats:

• Price may not be right Retailers and manufacturers can charge a premium for the convenience all-in-one computers offer. It's possible to spend less on a desktop tower PC if you're savvy about buying the various parts separately.
• Inferior accessories Don't expect to get the very best peripherals. You may end up so frustrated with the mouse or keyboard that you end up paying extra to replace them with something better.
• Performance problems All-in-one computers can sometimes short-change users on performance, with premium laptops and desktop PCs offering a more powerful setup. Thankfully, our pick of the best all-in-one computers will help you choose a model that doesn't scrimp on processing performance.
• Lack of portability. We've tested all-in-one computers that weigh nearly 10kg, meaning you won't want to move them around too much after you've found a spot for them.
• Upgradability Tower-style desktops give you more choice than an all-in-one (or laptop) when it comes to upgrading parts to extend your PC's lifetime.

Not sure an all-in-one is right for you? See our guides to the best laptops and best desktop computers.

Are all-in-one PCs any good?

There are plenty of reasons why an all-in-one PC might be the ideal option for you.

For starters, you get a bigger screen than with a laptop. All the models we've tested have standalone monitors with 24 to 27-inch displays. The biggest you get with a more portable laptop PC is 17 inches, with most between 11 and 15 inches.

All-in-ones are designed to look attractive, too. So if you don't want a clutter of cables and wires in your home office, an all-in-one PC could suit you.

The other major advantage is that all-in-ones are a one-stop shop. You don't have to faff around buying separate bits and pieces, as the monitor, mouse and keyboard are all right there in the box.

How much storage and which ports do you need with an all-in-one?

All-in-one PCs don't generally come with less than 512GB of storage, and many have more than 1TB. Unless you have an extensive collection of music, film or games that you like to keep on your hard drive, 512GB should be plenty for most people, with enough space for thousands of files, photos and programs.

Although more and more computing accessories now use Bluetooth and are wireless, you'll still want a couple of full-sized USB and USB-C ports. If you plan to connect to a second monitor, be sure to look out for an HDMI-out port, too.

Need some additional storage space? Get more by picking from the best external hard drives.

What else do you need?

Strictly speaking – nothing. That's the whole point of all-in-one PC; once out of the box, you can just plug and play, with keyboard and mouse already included.

• If you prefer more than one screen, which many people find makes them more productive, then most of the all-in-one PC featured here have an HDMI port that enables you to connect an extra one. See our round-up of the best computer monitors. 
• You could also add desktop speakers to improve the sound quality if desired.
• If you don't already have antivirus, we recommend you install the best antivirus software to ensure you're protected from malware, viruses and scams. We know that built-in Windows and macOS software isn't a patch on the best third-party programs when it comes to identifying phishing attacks. 
• We always recommend backing up your most valuable digital material, too. If you don't already do this, we have an easy-to-follow guide on how to back up important files on your computer. Plus, find out more about the best cloud storage and see our pick of the best external hard drives.