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ASUS ZenFone 4 Selfie Pro ZD552KL Smartphone Review

Florian Wimmer, 👁 Daniel Schmidt, Tanja Hinum (translated by Alex Alderson), 03/14/2018

Fire-red selfie machine. The ASUS ZenFone 4 Selfie Pro’s salient feature is its high-resolution dual front-facing cameras. This is coupled with good battery life, and it is all housed in a metal case. Can the ZenFone 4 Selfie Pro do enough to compete with the strong selection of mid-range smartphones?

ASUS ZenFone 4 Selfie Pro ZD552KL
ASUS ZenFone 4 Selfie Pro ZD552KL

Although the release of the ZenFone 5 marked ASUS’ move onto the next generation of their smartphone series, we still have some last generation models in our test lab. One of these is the ZenFone 4 Selfie Pro, a mid-range smartphone that still stands out with its dual front-facing camera and its fire-red finish. While ASUS has already released the ZenFone 4 Selfie and the ZenFone 4 Selfie Lite, the ZenFone 4 Selfie Pro is only officially available in Central Europe.

There are many similarly priced and sized competitors. There is the Wiko WIM, which has fallen significantly in price but which has hardware that is already somewhat outdated. There is the Samsung Galaxy A8 that is, as is often the case with Samsung, a solid mid-range device that is more understated than it is about having flashy features. The ZenFone 4 Selfie Pro faces stiff competition from the Nokia 8 and the Honor 9 too, both of which are equipped with high-end SoCs. We will be using all these smartphones as comparison devices in our tests.

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Asus ZenFone 4 Selfie Pro ZD552KL (Zenfone Series)
Graphics adapter
Memory
4096 MB 
Display
5.5 inch 16:9, 1920 x 1080 pixel 401 PPI, Capacitive touchscreen, AMOLED, 2.5 D, Corning Gorilla Glass 5, Glove mode, glossy: yes
Storage
64 GB eMMC Flash, 64 GB 
, 51.77 GB free
Connections
1 USB 2.0, Audio Connections: 3.5 mm jack, Card Reader: microSD up to 2 TB, 1 Fingerprint Reader, Brightness Sensor, Sensors: Accelerometer, Electronic compass, Gyroscope, Proximity sensor, RGB front sensor
Networking
802.11 b/g/n (b/g/n = Wi-Fi 4), Bluetooth 4.2, GSM (850/​900/​1800/​1900), UMTS (850/​900/​2100), LTE (B1/​B3/​B5/​B7/​B8/​B20/​B40), Dual SIM, LTE, GPS
Size
height x width x depth (in mm): 6.9 x 154 x 74.8 ( = 0.27 x 6.06 x 2.94 in)
Battery
11.4 Wh, 3000 mAh Lithium-Ion, QuickCharge
Operating System
Android 7.1 Nougat
Camera
Primary Camera: 16 MPix 26 mm focal length, 80° wide angle, dual-LED flash, 4K video at 30 FPS
Secondary Camera: 12 MPix Sony IMX362 Dual Pixel Camera sensor (1/2.55”, 1.4 µm pixel size), f/1.8 aperture, 25 mm focal length, 120° wide angle, 12 mm focal length, 4K video at 30 FPS
Additional features
Speakers: Five-magnet speaker with NXP smart AMP on the underside, Keyboard: Virtual keyboard, Headphones, USB charger, USB cable, SIM tool, Themes, ZenUI Safeguard, ZenMotion, SelfieMaster, 24 Months Warranty, Bandwidth (Download/Upload): 150 Mbps/50 Mbps (LTE); SAR value: 0/759 kg, 1.290 W/kg, VoLTE, UKW Radio, fanless
Weight
147 g ( = 5.19 oz / 0.32 pounds), Power Supply: 65 g ( = 2.29 oz / 0.14 pounds)
Price
449 Euro
Note: The manufacturer may use components from different suppliers including display panels, drives or memory sticks with similar specifications.

 

Case – stable metal

The ZenFone 4 Selfie Pro is equipped with a 5.5-inch display with a 16:9 aspect ratio. The display has relatively large top and bottom bezels, the latter of which houses the fingerprint scanner and navigation buttons. The case is 6.9 mm thick, with ASUS managing to keep the rear camera protrusion to a minimum on such a thin case. The device feels good in the hand though thanks to its rounded corners.

The case is made from metal with a matte finish on the rear. There are three colors available: black, red, and a combination of gold and white. The case feels high quality and stable. We found it difficult to flex the device, hearing only quiet creaking sounds when we managed to minimally flex it. We also could not affect the device by applying pressure to the front or rear either.

ASUS ZenFone 4 Selfie Pro ZD552KL
ASUS ZenFone 4 Selfie Pro ZD552KL
ASUS ZenFone 4 Selfie Pro ZD552KL
ASUS ZenFone 4 Selfie Pro ZD552KL
ASUS ZenFone 4 Selfie Pro ZD552KL
ASUS ZenFone 4 Selfie Pro ZD552KL
ASUS ZenFone 4 Selfie Pro ZD552KL
ASUS ZenFone 4 Selfie Pro ZD552KL

Size Comparison

156.2 mm / 6.15 inch 75.3 mm / 2.96 inch 7.9 mm / 0.311 inch 160 g0.3527 lbs154 mm / 6.06 inch 74.8 mm / 2.94 inch 6.9 mm / 0.2717 inch 147 g0.3241 lbs151.5 mm / 5.96 inch 73.7 mm / 2.9 inch 7.9 mm / 0.311 inch 160 g0.3527 lbs149.2 mm / 5.87 inch 70.6 mm / 2.78 inch 8.4 mm / 0.3307 inch 172 g0.3792 lbs147 mm / 5.79 inch 71 mm / 2.8 inch 7.5 mm / 0.2953 inch 155 g0.3417 lbs

Connectivity – decent storage, no NFC

The ZenFone 4 Selfie Pro has 4 GB RAM and 64 GB of internal storage, the combination of which makes it comparable to similarly priced smartphones. The device supports microSD card expansion or dual-SIM card slots. The second SIM-card slot doubles as a microSD-card slot, meaning that you have to choose either the functionality of microSD card expansion and a single nano-SIM card or dual-SIM card functionality. The microSD can only be formatted as external storage, so apps can only be stored on the internal storage. FM radio is supported, with the device using the headphone cable as an antenna.

The ZenFone 4 Selfie Pro is not equipped with NFC, while charging and data transfer is handled by a micro-USB 2.0 port.

Software - many apps

The device ships with Android Nougat 7.1.1 and has security patches dated December 2017. While Android Oreo should be rolled out, this was unavailable at the time of testing. Hopefully, a system update coincides with updated security patches too as they were somewhat dated by the time of our tests.

ASUS uses its ZenUI on the ZenFone 4 Selfie Pro, making minor visual changes from stock Android, and the company preinstalls some additional apps. There is a theme gallery, which allows for further UI modifications. Additionally, ASUS has installed a Mobile Manager app, in which cached data and notifications can be blocked for each app and one which supports a security scan feature too. Facebook’s suite of apps is preinstalled, but these can be uninstalled.

ASUS ZenFone 4 Selfie Pro ZD552KL software
ASUS ZenFone 4 Selfie Pro ZD552KL software
ASUS ZenFone 4 Selfie Pro ZD552KL software
ASUS ZenFone 4 Selfie Pro ZD552KL software
ASUS ZenFone 4 Selfie Pro ZD552KL software
ASUS ZenFone 4 Selfie Pro ZD552KL software
ASUS ZenFone 4 Selfie Pro ZD552KL software
ASUS ZenFone 4 Selfie Pro ZD552KL software

Communication and GPS – feeble Wi-Fi, weak GPS

The ZenFone 4 Selfie Pro supports 802.11 b/g/n Wi-Fi, meaning that the device is unable to connect to 5 GHz Wi-Fi networks nor can it take advantage of fast ac Wi-Fi. Our test device performed poorly in our standardized Wi-Fi test. The ZenFone 4 Selfie Pro can only achieve between one-fifth and one-seventh of the speeds attained by the Wiko WIM or the Galaxy A8. Even with the device close to the router and with full signal, web pages load subjectively slower than on our comparison devices. This difference in Wi-Fi speed was exacerbated when we tested the ZenFone 4 Selfie Pro 10 meters and three walls away from the router.

There is only support for seven LTE bands, a choice by ASUS which limits the ZenFone 4 Selfie Pro to just a few countries. While these bands are suitable for using the device in Central Europe, you may struggle to find signal further afield. Worse still, the download and upload speeds on the bands that are supported are not especially fast. We measured a maximum 150 Mbit/s download speed and a 50 Mbit/s upload speed. By contrast, the Honor 9 offers twice the maximum download speed than our test device. It is worth noting that the Chinese variant of the ZenFone 4 Selfie Pro has faster data speeds, while Westerners must settle for LTE Cat. 4.

Networking
iperf3 Client (receive) TCP 1 m 4M x10
Wiko WIM
Adreno 506, 626, 64 GB eMMC Flash
351 MBit/s ∼100% +554%
Honor 9
Mali-G71 MP8, Kirin 960, 64 GB eMMC Flash
283 MBit/s ∼81% +427%
Samsung Galaxy A8 2018
Mali-G71 MP2, 7885, 32 GB eMMC Flash
280 MBit/s ∼80% +421%
Nokia 8
Adreno 540, 835, 64 GB UFS 2.1 Flash
235 MBit/s ∼67% +338%
Average of class Smartphone
  (5.9 - 939, n=434)
226 MBit/s ∼64% +321%
Asus ZenFone 4 Selfie Pro ZD552KL
Adreno 506, 625, 64 GB eMMC Flash
53.7 MBit/s ∼15%
iperf3 Client (transmit) TCP 1 m 4M x10
Wiko WIM
Adreno 506, 626, 64 GB eMMC Flash
276 MBit/s ∼100% +396%
Samsung Galaxy A8 2018
Mali-G71 MP2, 7885, 32 GB eMMC Flash
269 MBit/s ∼97% +383%
Nokia 8
Adreno 540, 835, 64 GB UFS 2.1 Flash
235 MBit/s ∼85% +322%
Average of class Smartphone
  (9.4 - 703, n=434)
216 MBit/s ∼78% +288%
Honor 9
Mali-G71 MP8, Kirin 960, 64 GB eMMC Flash
140 MBit/s ∼51% +151%
Asus ZenFone 4 Selfie Pro ZD552KL
Adreno 506, 625, 64 GB eMMC Flash
55.7 MBit/s ∼20%
GPS test indoors
GPS test indoors
GPS test next to a window
GPS test next to a window
GPS test outside
GPS test outside

The ZenFone 4 Selfie Pro cannot find a location indoors even when next to a window. Outdoors we found that it takes a long time for the GPS to find a location, and then only to an accuracy of 20 meters when it does.

We took the ZenFone 4 Selfie Pro on a bike ride to measure its GPS accuracy against a Garmin Edge 500, which is a professional GPS-based cycling computer. By contrast to our earlier test, the ZenFone 4 Selfie Pro handled the bike ride well, accurately placing us on our route with only minor deviations from the Edge 500. So, while the GPS takes time to be ready to use, we would recommend it as a navigation device when it has found your location.

GPS ASUS ZenFone 4 Selfie Pro – Overview
GPS ASUS ZenFone 4 Selfie Pro – Overview
GPS ASUS ZenFone 4 Selfie Pro – Route
GPS ASUS ZenFone 4 Selfie Pro – Route
GPS ASUS ZenFone 4 Selfie Pro – Loop
GPS ASUS ZenFone 4 Selfie Pro – Loop
GPS Garmin Edge 500 - Overview
GPS Garmin Edge 500 - Overview
GPS Garmin Edge 500 - Route
GPS Garmin Edge 500 - Route
GPS Garmin Edge 500 – Loop
GPS Garmin Edge 500 – Loop

Telephone and Call Quality – decent sound

ASUS has changed the stock phone app, as call history is opened with the keypad. There are tabs for contacts and settings, of which there are a lot. There are even customization options, with ASUS having included a dark theme, different fonts, and the option to select a background image.

The call quality is good. Overall, voices sound clean and are clear, albeit with no depth to the sound. We noticed that voices became shrill at high volumes. Voices were intelligible over loudspeaker too, although there was some reverberance.

Cameras – good performance, especially from those on the front

Photograph taken with the 24 MP DuoPixel
Photograph taken with the 24 MP DuoPixel
Photograph taken with the 26 mm focal length front-facing camera
Photograph taken with the 26 mm focal length front-facing camera
Photograph taken with the wide-angle front-facing camera
Photograph taken with the wide-angle front-facing camera

ASUS is clear on the selling point of this device, having given it the name Selfie Pro, and reinforcing this by printing “We Love Photo” on the box. To live up to its name, the ZenFone 4 Selfie Pro is equipped with dual 12 MP sensors, one with normal focal length and the other that has a 120 ° wide-angle lens. What’s more, the software can stitch together the images taken with both sensors to create effectively a 24 MP image. This results in beautiful-looking photographs that are detailed and well lit. The main front-facing camera takes good shots, while the quality of the telephoto lens is subjective. There is a strong fisheye effect with clear distortion at the edges of the image. This produces funny group selfies, with those at the edge of the shot looking more like they would in a funhouse distorting mirror.

The main camera has a 16 MP sensor that takes relatively good photographs. These lack the brightness, detail, and sharpness of high-quality lenses, such as those in the OnePlus 5T.

4K videos can be taken with both the front-facing and rear cameras, but only up to 30 FPS. While the quality is passable, colors look a bit pale and there is visible motion blur.

Image Comparison

Choose a scene and navigate within the first image. One click changes the position on touchscreens. One click on the zoomed-in image opens the original in a new window. The first image shows the scaled photograph of the test device.

Scene 1Scene 2Scene 3

We then tested the camera quality in our lab, testing color reproduction under controlled lighting conditions. Text is rendered well against a colored background, while general sharpness is good too. We noticed some slight artefacts at the edges of the image with larger areas of color appearing pixelated and slightly unclean.

Photograph of reference card
Photograph of reference card
Detail of reference card
Detail of reference card
Photograph of ColorChecker colors. The lower half of each area shows the reference color.
Photograph of ColorChecker colors. The lower half of each area shows the reference color.

Accessories and Warranty – the usual

ASUS includes the typical accessories in the box: a pair of headphones, a modular power supply, a USB cable, a SIM tool, and a quick-start guide. ASUS includes a silicon case for devices sold in certain countries. This was not the case with our test device.

ASUS offers 24 months warranty with all their smartphones. Please see our Guarantees, Return Policies and Warranties FAQ for country-specific information.

Input Devices and Operation – many additional options

The ZenUI keyboard is based on the popular Swype keyboard app. There are numerous settings and many input options including word prediction, swiping, and voice dictation. These options ensure that using the keyboard is quick and intuitive. While ASUS’ ZenUI keyboard is the default, this could be changed for a different downloadable keyboard from the Play Store.

The touchscreen is sensitive and remains so at the corners of the display. Additionally, ASUS includes a glove mode so that the device can be easily used in cold weather. The fingerprint scanner works well, recognizing fingers quickly and unlocking the device from standby mode. This serves as a home button too and is flanked by touch-sensitive areas responsible for the task manager and back buttons, respectively. There is also gesture control that is handled by ZenMotion. This can be found in Settings.

The keyboard in horizontal mode
The keyboard in horizontal mode
The keyboard in portrait mode
The keyboard in portrait mode

Display – could be brighter

Subpixel array
Subpixel array

The ZenFone 4 Selfie Pro has an AMOLED Full HD display, a resolution that we have come to expect from devices at this price point. The Full HD display cannot compete with that found in the Nokia 8, which has a higher resolution Quad HD display. Equally, AMOLED displays are now common in mid-range smartphones, with half of our comparison devices equipped with this type of panel. These offer rich colors and absolute blacks, but typically at a cost of a lower maximum brightness. While the ZenFone 4 Selfie Pro cannot compete with the Nokia 8 or the Honor 9 in terms of maximum brightness, we measured up to 635 cd/m² brightness in our APL50 test. We measured brightness uniformity at 85%, with there being visible brightness differences across large areas of color.

493
cd/m²
458
cd/m²
427
cd/m²
480
cd/m²
456
cd/m²
424
cd/m²
481
cd/m²
455
cd/m²
421
cd/m²
Distribution of brightness
X-Rite i1Pro 2
Maximum: 493 cd/m² Average: 455 cd/m² Minimum: 3.93 cd/m²
Brightness Distribution: 85 %
Center on Battery: 456 cd/m²
Contrast: ∞:1 (Black: 0 cd/m²)
ΔE Color 5.6 | 0.6-29.43 Ø6
ΔE Greyscale 6.9 | 0.64-98 Ø6.2
Gamma: 2.3
Asus ZenFone 4 Selfie Pro ZD552KL
AMOLED, 1920x1080, 5.5
Wiko WIM
AMOLED, 1920x1080, 5.5
Nokia 8
IPS, 2560x1440, 5.3
Samsung Galaxy A8 2018
Super AMOLED, 2220x1080, 5.6
Honor 9
IPS/LTPS, 1920x1080, 5.15
Screen
-5%
11%
21%
33%
Brightness middle
456
344
-25%
735
61%
541
19%
550
21%
Brightness
455
353
-22%
707
55%
538
18%
535
18%
Brightness Distribution
85
90
6%
92
8%
96
13%
92
8%
Black Level *
0.79
0.42
Colorchecker DeltaE2000 *
5.6
5.7
-2%
6.7
-20%
5.8
-4%
3.3
41%
Colorchecker DeltaE2000 max. *
11.1
12.2
-10%
12.9
-16%
4.5
59%
Greyscale DeltaE2000 *
6.9
5.1
26%
8.3
-20%
2.7
61%
3.6
48%
Gamma
2.3 96%
2.73 81%
2.24 98%
2.07 106%
2.38 92%
CCT
7883 82%
7407 88%
8906 73%
6570 99%
7226 90%
Contrast
930
1310

* ... smaller is better

Screen Flickering / PWM (Pulse-Width Modulation)

To dim the screen, some notebooks will simply cycle the backlight on and off in rapid succession - a method called Pulse Width Modulation (PWM) . This cycling frequency should ideally be undetectable to the human eye. If said frequency is too low, users with sensitive eyes may experience strain or headaches or even notice the flickering altogether.
Screen flickering / PWM detected 373.1 Hz

The display backlight flickers at 373.1 Hz (Likely utilizing PWM) .

The frequency of 373.1 Hz is relatively high, so most users sensitive to PWM should not notice any flickering. However, there are reports that some users are still sensitive to PWM at 500 Hz and above, so be aware.

In comparison: 51 % of all tested devices do not use PWM to dim the display. If PWM was detected, an average of 9365 (minimum: 43 - maximum: 142900) Hz was measured.

Contrast and black levels are perfect thanks to the AMOLED display, which can individually turn off pixels. There is PWM display flickering, as is often the case with AMOLED panels. However, the frequency is high enough that only those with sensitive eyes should notice any display flickering.

The degree of color deviations is similar to those found in more expensive smartphones, while the Honor 9 outperforms the ZenFone 4 Selfie Pro here. We measured the grayscale to have a clear bluish tint. The ZenFone 4 Selfie Pro has different color modes including an option to let the smartphone automatically adjust colors.

CalMAN color accuracy – AdobeRGB
CalMAN color accuracy – AdobeRGB
CalMAN color space – AdobeRGB
CalMAN color space – AdobeRGB
CalMAN grayscale – Adobe RGB
CalMAN grayscale – Adobe RGB
CalMAN saturation – AdobeRGB
CalMAN saturation – AdobeRGB

Display Response Times

Display response times show how fast the screen is able to change from one color to the next. Slow response times can lead to afterimages and can cause moving objects to appear blurry (ghosting). Gamers of fast-paced 3D titles should pay special attention to fast response times.
       Response Time Black to White
4 ms ... rise ↗ and fall ↘ combined↗ 2 ms rise
↘ 2 ms fall
The screen shows very fast response rates in our tests and should be very well suited for fast-paced gaming.
In comparison, all tested devices range from 0.8 (minimum) to 240 (maximum) ms. » 2 % of all devices are better.
This means that the measured response time is better than the average of all tested devices (24.9 ms).
       Response Time 50% Grey to 80% Grey
4 ms ... rise ↗ and fall ↘ combined↗ 2 ms rise
↘ 2 ms fall
The screen shows very fast response rates in our tests and should be very well suited for fast-paced gaming.
In comparison, all tested devices range from 0.9 (minimum) to 636 (maximum) ms. » 1 % of all devices are better.
This means that the measured response time is better than the average of all tested devices (39.7 ms).

The AMOLED display has great viewing angles with no brightness or color changes. The brightness is sufficient for outdoor use, but the glossy finish may prove difficult on a sunny day where reflections will obscure what is being displayed on the screen.

Viewing angles
Viewing angles
Outdoor use – maximum brightness
Outdoor use – maximum brightness

Performance – good system performance, slow memory

The ZenFone 4 Selfie Pro is equipped with a Qualcomm Snapdragon 625 SoC, while graphics are handled by the Qualcomm Adreno 506. This is a popular SoC choice for current mid-range smartphones, even though Qualcomm has released the slightly more powerful Snapdragon 626, which powers the Wiko WIM. The ZenFone 4 Selfie Pro and the Wiko WIM perform equally well, with the Galaxy A8 slightly outperforming them. The Honor 9 and the Nokia 8 are out in front thanks to their high-end SoCs. In daily use these performance differences are negligible as even the slowest device in our benchmarks has enough power to cope with almost all current apps.

PCMark for Android
Work 2.0 performance score (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
5558 Points ∼46%
Wiko WIM
4660 Points ∼39% -16%
Nokia 8
6959 Points ∼58% +25%
Samsung Galaxy A8 2018
5214 Points ∼44% -6%
Honor 9
6113 Points ∼51% +10%
Average Qualcomm Snapdragon 625 (4626 - 5558, n=14)
4894 Points ∼41% -12%
Average of class Smartphone (2630 - 11440, n=372)
5257 Points ∼44% -5%
Work performance score (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
7846 Points ∼40%
Wiko WIM
5621 Points ∼29% -28%
Nokia 8
8282 Points ∼42% +6%
Samsung Galaxy A8 2018
5916 Points ∼30% -25%
Honor 9
7034 Points ∼36% -10%
Average Qualcomm Snapdragon 625 (4596 - 7846, n=16)
5855 Points ∼30% -25%
Average of class Smartphone (1077 - 14439, n=543)
5690 Points ∼29% -27%
BaseMark OS II
Web (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
828 Points ∼41%
Wiko WIM
933 Points ∼46% +13%
Nokia 8
1262 Points ∼62% +52%
Samsung Galaxy A8 2018
1195 Points ∼59% +44%
Honor 9
1069 Points ∼53% +29%
Average Qualcomm Snapdragon 625 (649 - 958, n=17)
772 Points ∼38% -7%
Average of class Smartphone (7 - 1745, n=627)
755 Points ∼37% -9%
Graphics (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
1026 Points ∼4%
Wiko WIM
965 Points ∼3% -6%
Nokia 8
5958 Points ∼21% +481%
Samsung Galaxy A8 2018
1331 Points ∼5% +30%
Honor 9
4126 Points ∼14% +302%
Average Qualcomm Snapdragon 625 (968 - 1026, n=17)
1008 Points ∼3% -2%
Average of class Smartphone (18 - 16996, n=627)
2034 Points ∼7% +98%
Memory (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
1108 Points ∼15%
Wiko WIM
1007 Points ∼13% -9%
Nokia 8
3540 Points ∼47% +219%
Samsung Galaxy A8 2018
2275 Points ∼30% +105%
Honor 9
3258 Points ∼43% +194%
Average Qualcomm Snapdragon 625 (584 - 1553, n=17)
1018 Points ∼14% -8%
Average of class Smartphone (21 - 7500, n=627)
1505 Points ∼20% +36%
System (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
3261 Points ∼20%
Wiko WIM
3549 Points ∼22% +9%
Nokia 8
5671 Points ∼34% +74%
Samsung Galaxy A8 2018
4358 Points ∼26% +34%
Honor 9
4154 Points ∼25% +27%
Average Qualcomm Snapdragon 625 (1960 - 3261, n=17)
2819 Points ∼17% -14%
Average of class Smartphone (369 - 14189, n=627)
2953 Points ∼18% -9%
Overall (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
1323 Points ∼16%
Wiko WIM
1339 Points ∼16% +1%
Nokia 8
3505 Points ∼41% +165%
Samsung Galaxy A8 2018
1993 Points ∼24% +51%
Honor 9
2779 Points ∼33% +110%
Average Qualcomm Snapdragon 625 (1019 - 1362, n=17)
1206 Points ∼14% -9%
Average of class Smartphone (1 - 6097, n=627)
1479 Points ∼18% +12%
Geekbench 4.4
Compute RenderScript Score (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
3186 Points ∼7%
Samsung Galaxy A8 2018
3680 Points ∼8% +16%
Honor 9
Points ∼0% -100%
Average Qualcomm Snapdragon 625 (2628 - 3678, n=10)
3281 Points ∼7% +3%
Average of class Smartphone (663 - 21070, n=321)
4685 Points ∼11% +47%
64 Bit Multi-Core Score (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
4320 Points ∼8%
Wiko WIM
4562 Points ∼8% +6%
Nokia 8
6479 Points ∼11% +50%
Samsung Galaxy A8 2018
4431 Points ∼8% +3%
Honor 9
6527 Points ∼11% +51%
Average Qualcomm Snapdragon 625 (3148 - 4396, n=12)
4171 Points ∼7% -3%
Average of class Smartphone (883 - 11598, n=380)
4703 Points ∼8% +9%
64 Bit Single-Core Score (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
875 Points ∼14%
Wiko WIM
939 Points ∼15% +7%
Nokia 8
1924 Points ∼30% +120%
Samsung Galaxy A8 2018
1526 Points ∼24% +74%
Honor 9
1869 Points ∼29% +114%
Average Qualcomm Snapdragon 625 (841 - 881, n=12)
866 Points ∼14% -1%
Average of class Smartphone (390 - 4824, n=380)
1420 Points ∼22% +62%
3DMark
2560x1440 Sling Shot Extreme (ES 3.1) Physics (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
2177 Points ∼48%
Wiko WIM
2106 Points ∼47% -3%
Nokia 8
3010 Points ∼67% +38%
Samsung Galaxy A8 2018
1950 Points ∼43% -10%
Honor 9
2287 Points ∼51% +5%
Average Qualcomm Snapdragon 625 (1636 - 2177, n=17)
1958 Points ∼44% -10%
Average of class Smartphone (486 - 4492, n=460)
1866 Points ∼42% -14%
2560x1440 Sling Shot Extreme (ES 3.1) Graphics (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
381 Points ∼5%
Wiko WIM
381 Points ∼5% 0%
Nokia 8
3894 Points ∼54% +922%
Samsung Galaxy A8 2018
618 Points ∼9% +62%
Honor 9
2798 Points ∼39% +634%
Average Qualcomm Snapdragon 625 (372 - 397, n=17)
384 Points ∼5% +1%
Average of class Smartphone (53 - 7150, n=460)
1451 Points ∼20% +281%
2560x1440 Sling Shot Extreme (ES 3.1) (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
467 Points ∼7%
Wiko WIM
466 Points ∼7% 0%
Nokia 8
3655 Points ∼58% +683%
Samsung Galaxy A8 2018
729 Points ∼12% +56%
Honor 9
2666 Points ∼42% +471%
Average Qualcomm Snapdragon 625 (452 - 484, n=17)
467 Points ∼7% 0%
Average of class Smartphone (68 - 6319, n=461)
1398 Points ∼22% +199%
2560x1440 Sling Shot OpenGL ES 3.0 Physics (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
2157 Points ∼48%
Wiko WIM
2140 Points ∼48% -1%
Nokia 8
3002 Points ∼67% +39%
Samsung Galaxy A8 2018
1946 Points ∼44% -10%
Honor 9
1809 Points ∼41% -16%
Average Qualcomm Snapdragon 625 (1631 - 2157, n=17)
1968 Points ∼44% -9%
Average of class Smartphone (293 - 4454, n=501)
1730 Points ∼39% -20%
2560x1440 Sling Shot OpenGL ES 3.0 Graphics (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
743 Points ∼7%
Wiko WIM
742 Points ∼7% 0%
Nokia 8
5818 Points ∼51% +683%
Samsung Galaxy A8 2018
879 Points ∼8% +18%
Honor 9
2990 Points ∼26% +302%
Average Qualcomm Snapdragon 625 (390 - 751, n=17)
710 Points ∼6% -4%
Average of class Smartphone (43 - 11302, n=500)
1890 Points ∼17% +154%
2560x1440 Sling Shot OpenGL ES 3.0 (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
870 Points ∼11%
Wiko WIM
868 Points ∼11% 0%
Nokia 8
4814 Points ∼59% +453%
Samsung Galaxy A8 2018
1001 Points ∼12% +15%
Honor 9
2611 Points ∼32% +200%
Average Qualcomm Snapdragon 625 (476 - 876, n=17)
826 Points ∼10% -5%
Average of class Smartphone (55 - 8136, n=503)
1635 Points ∼20% +88%
1280x720 offscreen Ice Storm Unlimited Physics (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
16146 Points ∼19%
Wiko WIM
16939 Points ∼20% +5%
Nokia 8
20951 Points ∼24% +30%
Samsung Galaxy A8 2018
13306 Points ∼15% -18%
Honor 9
15150 Points ∼18% -6%
Average Qualcomm Snapdragon 625 (14195 - 16267, n=16)
15727 Points ∼18% -3%
Average of class Smartphone (735 - 45072, n=662)
14069 Points ∼16% -13%
1280x720 offscreen Ice Storm Unlimited Graphics Score (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
13491 Points ∼3%
Wiko WIM
13241 Points ∼2% -2%
Nokia 8
56531 Points ∼11% +319%
Samsung Galaxy A8 2018
15262 Points ∼3% +13%
Honor 9
38979 Points ∼7% +189%
Average Qualcomm Snapdragon 625 (7668 - 13491, n=16)
12957 Points ∼2% -4%
Average of class Smartphone (536 - 209204, n=660)
21672 Points ∼4% +61%
1280x720 offscreen Ice Storm Unlimited Score (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
14003 Points ∼6%
Wiko WIM
14074 Points ∼6% +1%
Nokia 8
40968 Points ∼17% +193%
Samsung Galaxy A8 2018
14779 Points ∼6% +6%
Honor 9
28883 Points ∼12% +106%
Average Qualcomm Snapdragon 625 (8541 - 14003, n=16)
13468 Points ∼6% -4%
Average of class Smartphone (662 - 97276, n=660)
17599 Points ∼7% +26%
GFXBench (DX / GLBenchmark) 2.7
1920x1080 T-Rex HD Offscreen C24Z16 (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
23 fps ∼0%
Wiko WIM
23 fps ∼0% 0%
Nokia 8
99 fps ∼1% +330%
Samsung Galaxy A8 2018
34 fps ∼0% +48%
Honor 9
60 fps ∼0% +161%
Average Qualcomm Snapdragon 625 (22 - 23, n=17)
22.9 fps ∼0% 0%
Average of class Smartphone (0.5 - 322, n=683)
37.5 fps ∼0% +63%
T-Rex HD Onscreen C24Z16 (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
22 fps ∼1%
Wiko WIM
23 fps ∼1% +5%
Nokia 8
54 fps ∼2% +145%
Samsung Galaxy A8 2018
31 fps ∼1% +41%
Honor 9
55 fps ∼2% +150%
Average Qualcomm Snapdragon 625 (17 - 35, n=17)
22.9 fps ∼1% +4%
Average of class Smartphone (1 - 120, n=692)
27.9 fps ∼1% +27%
GFXBench 3.0
off screen Manhattan Offscreen OGL (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
9.9 fps ∼2%
Wiko WIM
10 fps ∼2% +1%
Nokia 8
51 fps ∼9% +415%
Samsung Galaxy A8 2018
16 fps ∼3% +62%
Honor 9
30 fps ∼5% +203%
Average Qualcomm Snapdragon 625 (3.1 - 10, n=17)
9.43 fps ∼2% -5%
Average of class Smartphone (0.8 - 175, n=589)
21.6 fps ∼4% +118%
on screen Manhattan Onscreen OGL (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
9.5 fps ∼3%
Wiko WIM
10 fps ∼3% +5%
Nokia 8
31 fps ∼8% +226%
Samsung Galaxy A8 2018
15 fps ∼4% +58%
Honor 9
28 fps ∼8% +195%
Average Qualcomm Snapdragon 625 (7.4 - 19, n=17)
10.6 fps ∼3% +12%
Average of class Smartphone (1.2 - 115, n=598)
19.2 fps ∼5% +102%
GFXBench 3.1
off screen Manhattan ES 3.1 Offscreen (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
6.4 fps ∼0%
Wiko WIM
6.4 fps ∼0% 0%
Nokia 8
36 fps ∼1% +463%
Samsung Galaxy A8 2018
9.9 fps ∼0% +55%
Honor 9
22 fps ∼0% +244%
Average Qualcomm Snapdragon 625 (3.5 - 14, n=17)
6.66 fps ∼0% +4%
Average of class Smartphone (0.87 - 117, n=455)
17.7 fps ∼0% +177%
on screen Manhattan ES 3.1 Onscreen (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
6.5 fps ∼0%
Wiko WIM
6.4 fps ∼0% -2%
Nokia 8
17 fps ∼0% +162%
Samsung Galaxy A8 2018
9.6 fps ∼0% +48%
Honor 9
22 fps ∼1% +238%
Average Qualcomm Snapdragon 625 (3.1 - 14, n=17)
6.52 fps ∼0% 0%
Average of class Smartphone (1.2 - 110, n=457)
16.6 fps ∼0% +155%
GFXBench
off screen Car Chase Offscreen (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
3.5 fps ∼1%
Wiko WIM
3.8 fps ∼1% +9%
Nokia 8
24 fps ∼6% +586%
Samsung Galaxy A8 2018
6 fps ∼2% +71%
Honor 9
15 fps ∼4% +329%
Average Qualcomm Snapdragon 625 (3.4 - 3.8, n=16)
3.52 fps ∼1% +1%
Average of class Smartphone (0.6 - 73, n=380)
12.1 fps ∼3% +246%
on screen Car Chase Onscreen (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
3.5 fps ∼2%
Wiko WIM
3.5 fps ∼2% 0%
Nokia 8
13 fps ∼8% +271%
Samsung Galaxy A8 2018
5.8 fps ∼3% +66%
Honor 9
16 fps ∼9% +357%
Average Qualcomm Snapdragon 625 (3.1 - 7.4, n=16)
3.98 fps ∼2% +14%
Average of class Smartphone (1.1 - 60, n=384)
10.8 fps ∼6% +209%
AnTuTu v7
MEM (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
6586 Points ∼34%
Samsung Galaxy A8 2018
6040 Points ∼31% -8%
Honor 9
11373 Points ∼59% +73%
Average Qualcomm Snapdragon 625 (4570 - 7431, n=6)
5923 Points ∼31% -10%
Average of class Smartphone (915 - 19329, n=291)
7844 Points ∼41% +19%
UX (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
21649 Points ∼27%
Samsung Galaxy A8 2018
32150 Points ∼39% +49%
Honor 9
40636 Points ∼50% +88%
Average Qualcomm Snapdragon 625 (19447 - 21974, n=6)
20817 Points ∼26% -4%
Average of class Smartphone (6403 - 81494, n=290)
33926 Points ∼42% +57%
GPU (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
12718 Points ∼4%
Samsung Galaxy A8 2018
25640 Points ∼8% +102%
Honor 9
61606 Points ∼19% +384%
Average Qualcomm Snapdragon 625 (12718 - 13599, n=6)
12942 Points ∼4% +2%
Average of class Smartphone (1572 - 221998, n=291)
44906 Points ∼14% +253%
CPU (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
40836 Points ∼25%
Samsung Galaxy A8 2018
52916 Points ∼32% +30%
Honor 9
57415 Points ∼35% +41%
Average Qualcomm Snapdragon 625 (25992 - 40836, n=6)
36737 Points ∼22% -10%
Average of class Smartphone (2443 - 153154, n=291)
54605 Points ∼33% +34%
Total Score (sort by value)
Asus ZenFone 4 Selfie Pro ZD552KL
81789 Points ∼14%
Samsung Galaxy A8 2018
116746 Points ∼21% +43%
Honor 9
171030 Points ∼30% +109%
Average Qualcomm Snapdragon 625 (65759 - 81789, n=6)
76418 Points ∼13% -7%
Average of class Smartphone (17073 - 462516, n=291)
141726 Points ∼25% +73%

Legend

 
Asus ZenFone 4 Selfie Pro ZD552KL Qualcomm Snapdragon 625, Qualcomm Adreno 506, 64 GB eMMC Flash
 
Wiko WIM Qualcomm Snapdragon 626, Qualcomm Adreno 506, 64 GB eMMC Flash
 
Nokia 8 Qualcomm Snapdragon 835 (8998), Qualcomm Adreno 540, 64 GB UFS 2.1 Flash
 
Samsung Galaxy A8 2018 Samsung Exynos 7885, ARM Mali-G71 MP2, 32 GB eMMC Flash
 
Honor 9 HiSilicon Kirin 960, ARM Mali-G71 MP8, 64 GB eMMC Flash

The difference in performance is noticeable in our browser tests though. While performance is adequate, there are noticeably longer load times and scrolling is not as smooth on the ZenFone 4 Selfie Pro than on its more powerful competitors.

JetStream 1.1 - Total Score
Nokia 8 (Chrome 61.0.3163.98)
63.365 Points ∼100% +130%
Honor 9 (Chrome 59)
58.6 Points ∼92% +113%
Samsung Galaxy A8 2018 (Chrome 64.0.3282.137)
49.07 Points ∼77% +78%
Average of class Smartphone (10 - 302, n=526)
41.4 Points ∼65% +50%
Asus ZenFone 4 Selfie Pro ZD552KL (Chrome 64)
27.556 Points ∼43%
Average Qualcomm Snapdragon 625 (21.3 - 31.8, n=17)
27.2 Points ∼43% -1%
Wiko WIM (Chrome Version 59)
26.965 Points ∼43% -2%
Octane V2 - Total Score
Nokia 8 (Chrome 61.0.3163.98)
11131 Points ∼100% +133%
Honor 9 (Chrome 59)
10208 Points ∼92% +113%
Samsung Galaxy A8 2018 (Chrome 64.0.3282.137)
9350 Points ∼84% +95%
Average of class Smartphone (894 - 49388, n=685)
6706 Points ∼60% +40%
Asus ZenFone 4 Selfie Pro ZD552KL (Chrome 64)
4786 Points ∼43%
Wiko WIM (Chrome Version 59)
4625 Points ∼42% -3%
Average Qualcomm Snapdragon 625 (3781 - 4979, n=17)
4524 Points ∼41% -5%
Mozilla Kraken 1.1 - Total Score
Average of class Smartphone (571 - 59466, n=710)
10594 ms * ∼100% -11%
Asus ZenFone 4 Selfie Pro ZD552KL (Chrome 64)
9564.3 ms * ∼90%
Average Qualcomm Snapdragon 625 (8028 - 12194, n=17)
9289 ms * ∼88% +3%
Wiko WIM (Chrome Version 59)
8781.2 ms * ∼83% +8%
Samsung Galaxy A8 2018 (Chrome 64.0.3282.137)
4275.2 ms * ∼40% +55%
Nokia 8 (Chrome 61.0.3163.98)
3159.8 ms * ∼30% +67%
Honor 9 (Chrome 59)
3149 ms * ∼30% +67%

* ... smaller is better

The ZenFone 4 Selfie Pro performs admirably in our microSD card performance tests. Using our reference card, the Toshiba Exceria Pro M501, our test device has faster access speeds than all comparison devices. However, the same cannot be said for internal storage access speeds. The ZenFone 4 Selfie Pro can only achieve relatively slow speeds and is much slower than the Nokia 8, which uses fast UFS 2.1 memory.

Asus ZenFone 4 Selfie Pro ZD552KLWiko WIMNokia 8Samsung Galaxy A8 2018Honor 9Average 64 GB eMMC FlashAverage of class Smartphone
AndroBench 3-5
-0%
80%
19%
35%
24%
4%
Sequential Write 256KB SDCard
72.14 (Toshiba Exceria Pro M501)
61.4
-15%
51.66 (Toshiba Exceria Pro M501)
-28%
62.29 (Toshiba Exceria Pro M501)
-14%
34.64 (Toshiba Exceria Pro M501)
-52%
57.6 (11.2 - 74.7, n=98)
-20%
49.1 (1.7 - 87.1, n=417)
-32%
Sequential Read 256KB SDCard
83.88 (Toshiba Exceria Pro M501)
83.8
0%
76.85 (Toshiba Exceria Pro M501)
-8%
77.92 (Toshiba Exceria Pro M501)
-7%
67.99 (Toshiba Exceria Pro M501)
-19%
76.3 (21.1 - 87.2, n=98)
-9%
67.3 (8.1 - 96.5, n=417)
-20%
Random Write 4KB
12
13.34
11%
14.57
21%
14.69
22%
32.7
173%
24 (3.4 - 88.2, n=112)
100%
21.5 (0.14 - 250, n=735)
79%
Random Read 4KB
36.8
38.1
4%
145.73
296%
82.62
125%
55.7
51%
54.3 (11.4 - 149, n=112)
48%
46.6 (1.59 - 196, n=735)
27%
Sequential Write 256KB
139.5
136.67
-2%
199.15
43%
104.2
-25%
204
46%
171 (40 - 246, n=112)
23%
95.5 (2.99 - 590, n=735)
-32%
Sequential Read 256KB
269.3
272.08
1%
680.39
153%
299.94
11%
293
9%
273 (95.6 - 704, n=112)
1%
269 (12.1 - 1504, n=735)
0%

Games – solid performer

Our test device handled games well. While loading times are noticeably longer than on other devices, complex games such as Asphalt 8: Airborne run fluidly at maximum quality.

During our tests we found the positional sensor and touchscreen to work without issue.

Angry Birds
Angry Birds
Asphalt 8: Airborne
Asphalt 8: Airborne

Emissions

Temperature – no noticeable temperature rise

Surface temperatures remain cool throughout, even under load. We measured a less than 2 °C rise in average and maximum temperatures on both the front and rear of the device. The back of the device has more of a uniform temperature distribution than on the front and has lower maximum temperatures too. This is only by a few degrees though, as our temperature illustration demonstrates.

Max. Load
 30 °C
86 F
29.7 °C
85 F
26.8 °C
80 F
 
 30.1 °C
86 F
29.4 °C
85 F
27.5 °C
82 F
 
 29 °C
84 F
28.8 °C
84 F
26.3 °C
79 F
 
Maximum: 30.1 °C = 86 F
Average: 28.6 °C = 83 F
26.5 °C
80 F
27.6 °C
82 F
27.7 °C
82 F
26.4 °C
80 F
26.8 °C
80 F
27.6 °C
82 F
25.8 °C
78 F
26.6 °C
80 F
27.3 °C
81 F
Maximum: 27.7 °C = 82 F
Average: 26.9 °C = 80 F
Power Supply (max.)  27.1 °C = 81 F | Room Temperature 20.6 °C = 69 F | Voltcraft IR-260
(+) The average temperature for the upper side under maximal load is 28.6 °C / 83 F, compared to the average of 33.1 °C / 92 F for the devices in the class Smartphone.
(+) The maximum temperature on the upper side is 30.1 °C / 86 F, compared to the average of 35.5 °C / 96 F, ranging from 22.4 to 51.7 °C for the class Smartphone.
(+) The bottom heats up to a maximum of 27.7 °C / 82 F, compared to the average of 34.1 °C / 93 F
(+) In idle usage, the average temperature for the upper side is 26.8 °C / 80 F, compared to the device average of 33.1 °C / 92 F.
Heat-map of the front of the ASUS ZenFone 4 Selfie Pro under load
Heat-map of the front of the ASUS ZenFone 4 Selfie Pro under load
Heat-map of the back of the ASUS ZenFone 4 Selfie Pro under load
Heat-map of the back of the ASUS ZenFone 4 Selfie Pro under load

Speakers – good sound

Pink noise speaker test
Pink noise speaker test

There is a single speaker located on the bottom edge of the device. It sounds good and produces better low and midrange sounds than other similarly priced devices do. This creates a warm sound that is occasionally interrupted by unpleasant highs. ASUS includes an outdoor mode designed to optimize the sound for noisy environments. In practice, this mode is of limited use as high frequencies are strengthened significantly, making for an uncomfortable sound in all but the noisiest of environments.

dB(A) 0102030405060708090Deep BassMiddle BassHigh BassLower RangeMidsHigher MidsLower HighsMid HighsUpper HighsSuper Highs2035.240.52532.937.23137.236.14031.740.95039.641.56328.327.78027.325.610026.927.512526.728.21602437.820020.944.725020.947.531519.555.840018.562.750017.56363017.566.980015.771.6100015.875.6125016.674.6160015.871.4200015.472250015.574.431501675.2400015.875.750001679.9630016.376.9800016.372.71000016.274.61250016.471.71600016.460.4SPL28.686.8N1.167.9median 16.4median 71.6Delta2.110.635.245.132.940.337.238.231.741.739.642.728.327.327.32926.92726.730.32437.620.942.820.951.919.555.518.560.717.564.617.567.915.769.515.872.316.670.115.872.215.470.815.573.11674.615.876.81670.216.373.716.376.616.273.716.465.716.454.328.6851.162.6median 16.4median 69.52.110.2hearing rangehide median Pink NoiseAsus ZenFone 4 Selfie Pro ZD552KLSamsung Galaxy A8 2018
Asus ZenFone 4 Selfie Pro ZD552KL audio analysis

(+) | speakers can play relatively loud (86.8 dB)
Bass 100 - 315 Hz
(-) | nearly no bass - on average 31.4% lower than median
(±) | linearity of bass is average (9.1% delta to prev. frequency)
Mids 400 - 2000 Hz
(+) | balanced mids - only 3.7% away from median
(+) | mids are linear (5.6% delta to prev. frequency)
Highs 2 - 16 kHz
(+) | balanced highs - only 4% away from median
(+) | highs are linear (4.4% delta to prev. frequency)
Overall 100 - 16.000 Hz
(±) | linearity of overall sound is average (20.3% difference to median)
Compared to same class
» 16% of all tested devices in this class were better, 9% similar, 75% worse
» The best had a delta of 13%, average was 25%, worst was 44%
Compared to all devices tested
» 44% of all tested devices were better, 9% similar, 47% worse
» The best had a delta of 3%, average was 21%, worst was 53%

Samsung Galaxy A8 2018 audio analysis

(+) | speakers can play relatively loud (85 dB)
Bass 100 - 315 Hz
(-) | nearly no bass - on average 28.7% lower than median
(±) | linearity of bass is average (9.6% delta to prev. frequency)
Mids 400 - 2000 Hz
(+) | balanced mids - only 2.8% away from median
(+) | mids are linear (5.3% delta to prev. frequency)
Highs 2 - 16 kHz
(+) | balanced highs - only 4.6% away from median
(+) | highs are linear (5.9% delta to prev. frequency)
Overall 100 - 16.000 Hz
(±) | linearity of overall sound is average (20.1% difference to median)
Compared to same class
» 15% of all tested devices in this class were better, 9% similar, 76% worse
» The best had a delta of 13%, average was 25%, worst was 44%
Compared to all devices tested
» 43% of all tested devices were better, 8% similar, 49% worse
» The best had a delta of 3%, average was 21%, worst was 53%

Frequency diagram in comparison (checkboxes are de/selectable)

Battery Life

Power Consumption – moderate under load

The ZenFone 4 Selfie Pro shines in terms of energy management. It only moderately consumes power even under load, making it significantly more energy-efficient than our comparison devices.

Power Consumption
Off / Standbydarklight 0.01 / 0.15 Watt
Idledarkmidlight 0.58 / 1.31 / 1.33 Watt
Load midlight 1.88 / 3.8 Watt
 color bar
Key: min: dark, med: mid, max: light        Metrahit Energy
Asus ZenFone 4 Selfie Pro ZD552KL
3000 mAh
Wiko WIM
3200 mAh
Nokia 8
3090 mAh
Samsung Galaxy A8 2018
3000 mAh
Honor 9
3200 mAh
Power Consumption
-20%
-97%
-28%
-102%
Idle Minimum *
0.58
0.93
-60%
0.86
-48%
0.67
-16%
1.13
-95%
Idle Average *
1.31
1.28
2%
2.13
-63%
1.02
22%
2.25
-72%
Idle Maximum *
1.33
1.37
-3%
2.16
-62%
1.1
17%
2.3
-73%
Load Average *
1.88
2.39
-27%
4.65
-147%
3.86
-105%
4.89
-160%
Load Maximum *
3.8
4.25
-12%
9.99
-163%
5.97
-57%
7.99
-110%

* ... smaller is better

Battery Life – very respectable

The ZenFone 4 Selfie Pro performs better than all comparison devices in our Wi-Fi test, albeit only just. Our test device managed almost 11 hours, lasting four minutes longer than the next best comparison device. Thanks to its energy-efficiency, the 3,000 mAh battery capacity outlasts even those with slightly larger batteries. In daily use, the ZenFone 4 Selfie Pro should easily last a full workday, and potentially a second with light usage. Quick Charge is supported, meaning that the battery can be fully recharged in around 90 minutes.

Battery Runtime
NBC WiFi Websurfing Battery Test 1.3
10h 54min
Asus ZenFone 4 Selfie Pro ZD552KL
3000 mAh
Wiko WIM
3200 mAh
Nokia 8
3090 mAh
Samsung Galaxy A8 2018
3000 mAh
Honor 9
3200 mAh
Battery Runtime
-25%
-1%
-1%
-21%
Reader / Idle
1506
1546
1399
WiFi v1.3
654
492
-25%
650
-1%
646
-1%
516
-21%
Load
237
260
278
H.264
733
908
564

Pros

+ good front-facing cameras with many selfie options
+ decent main camera
+ long battery life
+ low energy consumption
+ remains cool to the touch
+ adequate system performance
+ quick access to microSD cards
+ decent speakers
+ great AMOLED display

Cons

- poor Wi-Fi and GPS
- slow memory access speeds
- slow browser performance
- relatively low brightness
- low maximum LTE speed
- no NFC

Verdict

The ASUS ZenFone 4 Selfie Pro in review. Test device provided by ASUS Germany.
The ASUS ZenFone 4 Selfie Pro in review. Test device provided by ASUS Germany.

The ASUS device has brought some color to our test lab with its trendy fire-red case. There is more to the ZenFone 4 Selfie Pro than its coloring though, with the smartphone managing to live up to its marketing and name. The 24 MP DuoPixel mode takes good selfies, while the wide-angle lens can be used to create funny effects, including a fisheye effect. The photo software is comprehensive with many useful features. The main camera takes decent photographs for a mid-range smartphone, too.

If you are looking for a smartphone that takes good selfies, then look no further. The ASUS ZenFone 4 Selfie Pro does a lot of things well, with only a few compromises. The Wi-Fi, GPS, and internal storage could be faster. Equally, preinstalled software is often a double-edged sword, and a brighter display would have been useful for outdoor use. The performance is good though, as is the battery life. The power consumption is low, the case remains cool even under load, and the speaker is decent. The ZenFone 4 Selfie Pro reads microSD cards quickly, the internal storage size is adequate and there are many input options.

The ASUS ZenFone 4 Selfie Pro’s front-facing dual-camera is impressive. Apart from that, ASUS has delivered a very capable mid-range smartphone.

We recommend the ZenFone 4 Selfie Pro primarily because it achieves what it sets out to do: Take good selfies. It is a mid-range smartphone that generally takes good photos.

Asus ZenFone 4 Selfie Pro ZD552KL - 03/08/2018 v6(old)
Florian Wimmer

Chassis
89%
Keyboard
67 / 75 → 90%
Pointing Device
96%
Connectivity
41 / 60 → 68%
Weight
93%
Battery
94%
Display
82%
Games Performance
28 / 63 → 45%
Application Performance
54 / 70 → 78%
Temperature
95%
Noise
100%
Audio
65 / 91 → 71%
Camera
73%
Average
75%
86%
Smartphone - Weighted Average

Pricecompare

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> Notebook / Laptop Reviews and News > Reviews > ASUS ZenFone 4 Selfie Pro ZD552KL Smartphone Review
Florian Wimmer, 2018-03-14 (Update: 2019-03-20)
Alex Alderson
Alex Alderson - News Editor - @aldersonaj
Prior to writing and translating for Notebookcheck, I worked for various companies including Apple and Neowin. I have a BA in International History and Politics from the University of Leeds, which I have since converted to a Law Degree. Happy to chat on Twitter or Notebookchat.