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Best all-in-one computers 2025: tested by experts
The best all-in-one computers are an attractive choice if you work at home and need a PC that's powerful and easy to use, and will also look good.
As the name suggests, all-in-one computers bring together 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 seven top all-in-one computers from a selection of the world's biggest computing brands – including Dell, HP, Lenovo and an Apple 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 computer with confidence, knowing you're getting the best for your budget.
How our tests find you the best
We've tested all-in-one computers
We lab test the latest big-brand all-in-ones so we can tell you which are the best models for performance and value.
Performance
Our independent benchmark tests will ensure you choose a model that keeps up with you for years to come.
Screen quality
Every brand will say their screen looks stunning and is easy to read – our experts sort the diamonds from the duds.
We also test…
The crucial ergonomics of the keyboard and mouse, plus our experts assess each all-in-one's sound quality and build quality.
The best all-in-one computers we tested
Only logged-in Which? members can view our all-in-one computers test results to discover which we rate as the very best all-in-one computers.
Join Which? to get instant access to our test results and Best Buy recommendations below.
| Product category | Price | Score | Performance | Screen quality | Mouse | Processor |
|---|---|---|---|---|---|---|
Sign up to reveal Get instant access to this and all our scores and recommendations Unlock tableAlready a member? Log in | 89% | |||||
| 79% | ||||||
| 77% | ||||||
| 76% | ||||||
| 76% | ||||||
| 76% | ||||||
| 75% |
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Date tested: June 2025. Page last checked: June 2025. We are not able to show every retailer and cheaper prices may be available.
The all-in-one computers we tested are listed in alphabetical order below.
Only logged-in Which? members can view the best all-in-one computers from our tests.
Join Which? to get instant access to our test results and Best Buy recommendations below.
Acer Aspire C24-195ES
Most recently tested June 2025
Screen size 23.8-inch
Other tech specs Intel Core Ultra 5 125U processor, 8GB Ram, 1TB SSD storage
Need to know four full-size USB ports, one USB-C, full-size HDMI, Ethernet, Wi-Fi 6, Full HD display (1,920 x 1,080 resolution), 540 x 228 x 513 cm (WxDxH), 5.2kg, 14 cores (4 high performance, 10 efficiency)
Asus A3402 (A3402WVAK)
Most recently tested June 2025
Screen size 23.8-inch
Other tech specs Intel Core i5-1335U processor, 8GB Ram, 512GB SSD storage
Need to know five full-size USB ports, one USB-C, full-size HDMI, Ethernet, Wi-Fi 6E, Full HD display (1,920 x 1,080 resolution), 539 x 165 x 423 cm (WxDxH), 5.8kg, 10 cores (2 high performance, 8 efficiency)
Apple iMac
Most recently tested June 2025
Screen size 24-inch
Other tech specs Apple M4 processor, 16GB Ram, 256GB SSD storage
Need to know no full-size 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), 547 x 147 x 461 cm (WxDxH), 5kg, 8 cores (4 high performance, 4 efficiency)
Dell 24 All-in-One
Available from Dell (£979 – choose our tested spec configuration or better)
Most recently tested June 2025
Screen size 23.8-inch
Other tech specs Intel Core 7 150U processor, 16GB Ram, 1TB SSD storage
Need to know four full-size USB ports, one USB-C, full-size HDMI, Ethernet, Wi-Fi 6E, Full HD display (1,920 x 1,080 resolution), 541 x 201 x 414 cm (WxDxH), 5.9kg, 10 cores (2 high performance, 8 efficiency)
Looking for something more portable? Take a look at our expert laptop reviews
Dell 27 All-in-One
Most recently tested June 2025
Screen size 27-inch
Other tech specs Intel Core i5-1334U processor, 16GB Ram, 512GB SSD storage
Need to know four full-size USB ports, one USB-C, full-size HDMI, Ethernet, Wi-Fi 6E, Full HD display (1,920 x 1,080 resolution), 604 x 201 x 455 cm (WxDxH), 6.8kg, 10 cores (2 high performance, 8 efficiency)
HP OmniStudio X 27-cs0002na
Most recently tested June 2025
Screen size 27-inch
Other tech specs Intel Core Ultra 5 125H processor, 16GB Ram, 1TB SSD storage
Need to know four full-size USB ports, two USB-C, full-size HDMI, Ethernet, 3.5mm aux, Wi-Fi 7, 4K UHD display (3,840 x 2,160 resolution), 614 x 200 x 537 cm (WxDxH), 9.3kg, 14 cores (4 high performance, 10 efficiency)
Lenovo IdeaCentre AIO I Gen9 24IRH9
Most recently tested June 2025
Screen size 23.8-inch
Other tech specs Intel Core i3-1315U processor, 8GB Ram, 512GB SSD storage
Need to know three full-size USB ports, one USB-C, full-size HDMI, Ethernet, Wi-Fi 6, Full HD display (1,920 x 1,080 resolution), 540 x 192 x 431 cm (WxDxH), 6.3kg, 6 cores (2 high performance, 4 efficiency)
How we test all-in-one computers
We carry out dozens of tests on every all-in-one computer before calculating the final test score – 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, like browsing the web and streaming videos.
- Plus, we use industry-recognised benchmarking to really put the machines through their paces. This gives us a better idea of how well a computer will respond to tougher tasks like photo editing, video editing and gaming.
- 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 provided pointer. We consider how comfortable it is in the hand and whether the clicks feel satisfying to use.
- 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 in use.
- We also look at the range of port 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. Plus, how distracting reflections are when using the computer in a well lit office room.
- Then an audio expert evaluates the quality of sound when listening through speakers or headphones. They listen out for clarity, volume and depth when awarding their ratings.
Key features
- Our features rating doesn't make up a significant portion of the overall score, but for some shoppers it will be important to know how many full-sized USB or HDMI ports it has (see 'Need to know' in our reviews above).
- This aspect of the test also considers specs like storage space, amount of short-term memory (Ram) and the number of processor cores. Don't just assume that a processor with a higher number of total cores is better: Intel processors include smaller 'efficiency' cores - the number of performance cores is more important than the total number overall.
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 computers?
All-in-one computers represent a neat, easy-to-set-up home computing option. And, as you'll discover from our expert reviews above, there are excellent all-in-one computers available.
However, it's worth considering these caveats:
- Price may not be right: With everything packaged up into one box, retailers and manufacturers can charge a premium for the convenience all-in-one computers offer. It's possible to spend less if you're savvy about buying the various parts separately with a tower-style desktop.
- 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 more a more powerful setup. Thankfully, our pick of the best all-in-one computers will help you choose a model that doesn't slouch when it comes to processing performance.
- Lack of portability: We've tested all-in-one computers that weight nearly 10kg, meaning you won't want to move it around too much after you've found a spot for it.
- Upgradability: Tower-style desktops give you more choice than an all-in-one (or laptop) when it comes to later upgrading parts to extend your PC's lifetime.
Not sure an all-in-one is right for you? Take a look at our guides to the best laptops and best desktop computers.
Are all-in-one computers any good?
There are plenty of reasons why an all-in-one computer might be the ideal option for you.
You get a bigger screen than with a laptop. All of the models listed above 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.
All-in-ones are designed to look attractive, too. So if you're wanting something to go in the home office and don't want a clutter of cables and wires, all-in-one PCs tend to be pleasing on the eye.
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. Just plug it in and you're ready to go.
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How much storage and which ports do you need with an all-in-one?
All-in-one PCs don't generally come with less storage than 512GB and many have upwards of 1TB. Unless you have extensive music, film or gaming collections that you like to keep on your hard drive, 512GB is going to be more than enough storage for most people, with enough space for thousands of files, photos and programs.
Although more and more computing accessories are now able to be used via Bluetooth, you'll still want a couple of full-sized and USB-C ports. If you plan to connect up 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 with an all-in-one computer?
Strictly speaking – nothing. That's the whole point of all-in-one computers; once out of the box, you can just plug and play, with keyboard and mouse already included.
We appreciate, of course, that you may be somebody who is looking for a multi-screen setup. Many people find having two or more screens makes them more productive. Thankfully, most of the all-in-one computers recommended in this article have an HDMI port that allows you to connect an extra screen - 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 antivirus, we recommend you install the best antivirus software to ensure that you're protected from malware, viruses and scams. This remains more of a requirement for Windows PC users than for Apple hardware.
We always recommend that you back up your most valuable digital material, too, so you may want to consider taking a look at our guide to the best cloud storage. If you don't already do this, we have an easy-to-follow guide on how to back up important files on your computer.