Asus Zenfone 9 evaluation The small smartphone of preference
Asus is tackling a part of the market that others seem to have abandoned with the Zenfone 9.
It’s the compact flagship phone segment, meaning that those who want a smaller device don’t have to compromise on the top specs.
There isn’t huge competition in this space: the Sony Xperia 5 III (and IV when it is announced) or the Xiaomi 12 are the only obvious rivals.
That leaves Asus to exploit this position, and, in the Zenfone 9, it’s doubling down on the work it started with the Zenfone 8.
Our quick take
The Asus Zenfone 9 stands out as one of the most compact and powerful phones available.
Attractively designed, there’s no compromise on the hardware specs in this diminutive device, making it an attractive choice for anyone who doesn’t want a massive phone.
The performance, display and battery life are great, and the cameras provide superb results – hampered only slightly by the lack of a zoom.
The biggest negative is on the software front. A short support window and additional duplicating bloatware mean this isn’t as clean as some rivals, and it’s difficult to see why Asus thinks that adding its own phone app or clock is going to make the experience better for anyone.
But, on balance, despite the price rise over the Zenfone 8, if it’s a small phone you’re after, this is the one to choose. It delivers in all areas, doesn’t scrimp on hardware or features and slips into your pocket just that little bit easier.
Design and build
146.5 x 68.1 x 9.1mm; 169g
Gorilla Glass Victus
Sticking to a compact form factor, the Zenfone 9 is about the same size as the Zenfone 8, but it makes some fairly significant changes.
That includes a shift in the body design, from those curved edges to a squared finish.
There’s a hint of iPhone about it, although the Zenfone builds on this with two huge camera lenses on the rear which really makes it stand out from the previous model, while the rear is a totally different material, too.
Asus has ditched the glass rear, this time using a composite, but it’s been formulated to give it a soft touch texture. It’s tactile, it’s strokable and it’s grippy. It’s also unique, staying free from fingerprints and avoiding reflections.
There are details scattered around it to make it a little more interesting than just a plain phone, like the 09 numbering and the camera details scribed on the back. It’s not garish like some devices and the more time we spend with it, the more we like it.
Around the power button, there’s been a fairly significant change. Asus has ditched the in-display fingerprint scanner and opted to put it in the power button on the side of the phone. But it’s not just for unlocking – which it seems to do perfectly well – but it also has support for swipes.
We’ve seen similar from Sony Xperia in the past and it’s a good use of space, allowing things like swiping to pull down the notifications shade or to refresh an app or webpage. Sounds great, but we found ourselves regularly swiping down the notifications when handling the phone, so you may well find yourself turning this feature off.
Despite being a compact phone, Asus is still offering stereo speakers and a 3.5mm headphone socket. On the wireless front, there’s Hi-Res music support from aptX Adaptive and LDAC, so with supporting headphones, you’re well served.
There are stereo speakers with appreciable volume and they sound great, although there’s a fair amount of vibration through the back of the phone at the highest settings. Still, it’s great for gaming without headphones.
The whole thing is wrapped in a package that offers IP68 waterproofing, again, with no compromise for choosing a smaller device. There’s even a free hard shell in the box to protect your phone.
5.9in, 2400 x 1080 pixels, 445ppi
Samsung AMOLED, 120Hz
The display on the Zenfone 9 is the same size and resolution as the previous edition of this phone, sticking to that 5.9-inch diagonal and a full HD+ resolution.
With a 446ppi pixel density, this display is plenty sharp and thanks to the AMOLED tech, it’s nice and punchy too.
There’s also a peak brightness of 1100 nits, meaning it can punch through reflections in bright conditions.
The Zenfone 9 offers a 120Hz refresh rate, which is the same as the Zenfone 8, with the same arrangement of letting you choose 60, 90 or 120Hz, or just leaving it in auto to let the phone choose the best refresh rate for the content you’re viewing.
There’s support for HDR too, so when you fire up your favourite streaming service you’ll get the best performance from it – although in all honesty, at this size, it’s difficult to really spot any real advantage.
Overall, the only downside of course is that you have a little less space on this phone than on most other devices – but having a smaller phone is probably the reason you’re interested in this device in the first place.
Hardware and performance
Snapdragon 8+ Gen 1
4300mAh; 30W charging
The Zenfone 9 comes with the latest version of Qualcomm’s top mobile hardware – the Snapdragon 8+ Gen 1.
This isn’t a huge advancement over the Snapdragon 8 Gen 1, but it makes incremental gains – and it’s a couple of steps forward over the Snapdragon 888 in the older Zenfone 8.
It’s supported by 8-16GB of RAM, with options for 128 or 256GB of storage, so there are a number of model options to choose from. There’s no microSD support, but there is dual SIM support.
The great advantage of packing this hardware into this phone is that you’re getting flagship performance, rather than having to compromise on the power available, which is the case in some other smaller devices.
The biggest criticism we had of the Zenfone 8 was that it ran a little hot. The Zenfone 9 is a little better in this regard, switching to a vapour chamber for cooling, rather than using heat pipes.
That helps keep things cooler, but when you push the phone it will still heat up a little: there’s just less space for cooling than in a larger phone.
We haven’t found that to downgrade the performance, however, and long gaming sessions are no problem – apart from being a little cramped with the controls on the display.
There’s a 30W HyperCharge charger in the box (a rarity these days), too, which means you can quickly recharge the 4300mAh battery.
It’s not the fastest charger out there, but, unless you really need to get out of the door, we can’t see that being a huge problem for anyone.
There’s no wireless charging, however – it’s cable only
The battery life is also good. In lighter use this phone will make it through the day and into the next pretty easily, so you don’t necessarily have to charge it every night.
Overall, the performance delivers much the same experience as any other flagship phone. It’s smooth and fast, and perfectly capable.
The only real difference between this and most flagship phones is the fact that it’s much more compact.
Double rear camera:
Main: 50MP, 1/1.56in, f/1.9, 1.0μm
Ultrawide: 12MP, 1/2.55in, f/2.2, 1.4μm
Selfie: 12MP, 1/2.93in, f/2.2, 1.22μm
There are two cameras on the back of the phone, with the main camera employing the skills of a 6-axis gimbal to smooth everything out. That partly explains why the camera lenses look so big.
It’s worth noting that the main camera protrudes a little more than the ultrawide camera, too, but we’re guessing that part of that is to support the gimbal.
While there’s a main and ultrawide camera, the downside of this arrangement is that there’s no telephoto, so the Zenfone 9 can’t compete with other models with that dedicated lens.
Where it can compete is through that main camera. It’s a Sony IMX 776 sensor and you’ll get great consistent shots in most conditions, with accurate colours and plenty of detail. There’s some inconsistency between the main and ultrawide camera – the latter producing darker photos.
Low light photography is pretty good, but noise does come creeping and things soften fairly rapidly. Using the camera doesn’t give you the sense that there’s a big AI machine in the background fixing everything for you.
Overall, however, it’s hard to really point to any particular faults with the camera.
As a point-and-shoot phone, it works really well, while there are additional modes and options if you want to take things a little further.
Android 12 with ZenUI
Two OS updates
Two years of security updates
The software on the Zenfone 9 at launch is Android 12, customised with Asus’ ZenUI. That adds tweaks and changes to the experience so you’ll see a visual difference around areas like the settings and menus.
The one positive we’ve found in ZenUI is the direct toggle for Wi-Fi in the quick settings – which stock Android seems to have sullied – so if you’re regularly switching off Wi-Fi, it’s super easy on this phone.
The Asus Zenfone 9 is the compact phone of choice, making few compromises to deliver a flagship experience in a smaller package. There’s plenty of power and performance, with good cameras only marred by the lack of telephoto. The design is attractive and the build is quality, including waterproofing. Still, the phone is let down through the software – bloat and app duplication are compounded by relatively short support, with only two years of updates.
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