Asus Zenfone 4 Pro ZS551KL vs Google Pixel 3a

Compare recorded specifications, size and practical differences.

+ Add a third phone

Key differences

Calculated from recorded specifications using minimum difference thresholds. These are differences, not an overall ranking. For three phones, numeric highlights compare the two extremes.

  • Weight

    Pixel 3a: 28 g lighter

    Zenfone 4 Pro ZS551KL:
    175 g
    Pixel 3a:
    147 g
  • Width

    Pixel 3a: 5.5 mm narrower

    Zenfone 4 Pro ZS551KL:
    75.6 mm
    Pixel 3a:
    70.1 mm
  • Chipset

    Zenfone 4 Pro ZS551KL:
    Qualcomm MSM8998 Snapdragon 835 (10 nm)
    Pixel 3a:
    Qualcomm SDM670 Snapdragon 670 (10 nm)
  • Rear camera layout

    Zenfone 4 Pro ZS551KL:
    Dual
    Pixel 3a:
    Single
  • Depth

    Zenfone 4 Pro ZS551KL: 0.6 mm thinner

    Zenfone 4 Pro ZS551KL:
    7.6 mm
    Pixel 3a:
    8.2 mm
  • Height

    Pixel 3a: 5.6 mm shorter

    Zenfone 4 Pro ZS551KL:
    156.9 mm
    Pixel 3a:
    151.3 mm

Physical size

Relative size, not calibrated actual size. Front and side outlines share one scale and a bottom baseline. Generic outlines use recorded body dimensions, excluding camera bumps.

  1. 1. Zenfone 4 Pro ZS551KL

    Height:
    156.9 mm +5.6 mm versus Pixel 3a
    Width:
    75.6 mm +5.5 mm versus Pixel 3a
    Depth:
    7.6 mm
  2. 2. Pixel 3a

    Height:
    151.3 mm
    Width:
    70.1 mm
    Depth:
    8.2 mm +0.6 mm versus Zenfone 4 Pro ZS551KL

Weight

Bars start at zero and share a scale within this chart.

  1. 1. Zenfone 4 Pro ZS551KL

    175 g

    +28 g versus Pixel 3a

  2. 2. Pixel 3a

    147 g

Screen size

Approximate rectangular screens calculated from recorded diagonal and aspect ratio at one relative scale. Rounded corners and cutouts are not subtracted. These are not phone outlines or calibrated actual sizes.

  1. 1. Zenfone 4 Pro ZS551KL

    Screen diagonal:
    5.5 in
    Aspect ratio (height:width):
    16:9
    Approximate rectangular screen area:
    83.4 cm²
  2. 2. Pixel 3a

    Screen diagonal:
    5.6 in
    Aspect ratio (height:width):
    18.5:9
    Approximate rectangular screen area:
    79.6 cm²

Zenfone 4 Pro ZS551KL has approximately 4.8% more rectangular screen area than Pixel 3a.

Memory variants

Each row compares the same storage capacity. Cells show recorded RAM alternatives, not combined maxima. Not recorded does not mean unavailable in every market.

Recorded RAM for Zenfone 4 Pro ZS551KL, Pixel 3a, compared at the same storage capacity.
StorageZenfone 4 Pro ZS551KLPixel 3a
64 GB 6 GB RAM Unknown
128 GB 6 GB RAM Unknown
Pixel 3a: Original memory entry

64 GB · 512GB 4GB

Practical features

Explicit Yes and No values are shown directly. Qualified or regional records retain their details. Unknown means the record is missing.

1. Zenfone 4 Pro ZS551KL

NFC:
Yes
Headphone jack:
Yes
Memory card support:
See details microSD · up to 512 GB (uses SIM 2 slot)

2. Pixel 3a

NFC:
Yes
Headphone jack:
Yes
Memory card support:
No

Battery capacity

Capacity is not battery life. No endurance test is implied.

Recorded battery capacity

Bars start at zero and share a scale within this chart.

  1. 1. Zenfone 4 Pro ZS551KL

    3600 mAh

    +600 mAh versus Pixel 3a

  2. 2. Pixel 3a

    3000 mAh

Specifications

Open a section for more detail. On narrow screens, swipe sideways or use Left/Right arrow keys while the table is focused. Unknown means missing data, not No. Recorded zero values are shown as recorded.

1. Zenfone 4 Pro ZS551KL2. Pixel 3a

Everyday essentials
Everyday essentials — specifications for Zenfone 4 Pro ZS551KL, Pixel 3a.
SpecificationZenfone 4 Pro ZS551KLPixel 3a
Dimensions (HxWxD)
  • 156.9 Х 75.6 Х 7.6 mm
  • 151.3 Х 70.1 Х 8.2 mm
Weight
  • 175 g
  • 147 g
Technology
  • AMOLED
  • OLED
Screen size
  • 5.5" inch
  • 5.6" inch
Screen resolution
  • 1080 x 1920 px
  • 1080 x 2220 px
Internal memory Recorded storage / RAM variants. Entries are alternatives, not a combined maximum. Ambiguous formats stay as recorded.
  • 64/128 GB
  • 6 GB RAM
  • 64 GB
  • 512GB 4GB
Memory card support
  • microSD
  • up to 512 GB (uses SIM 2 slot)
  • No
Battery Capacity is not battery life. No endurance test is implied.
  • 3600 mAh
  • Non-removable Li-Ion
  • 3000 mAh
  • Non-removable Li-Po
Operating system OS
  • Android 7.1.1 (Nougat)
  • upgradable to Android 8 (Oreo); ZenUI 4
  • Android 9.0 (Pie)
Chipset
  • Qualcomm MSM8998 Snapdragon 835 (10 nm)
  • Qualcomm SDM670 Snapdragon 670 (10 nm)
NFC
  • Yes
  • Yes
Headphone jack
  • Yes
  • Yes
Display
Display — specifications for Zenfone 4 Pro ZS551KL, Pixel 3a.
SpecificationZenfone 4 Pro ZS551KLPixel 3a
Touchscreen
  • capacitive touchscreen
  • capacitive touchscreen
Display colors
  • 16M
  • Type OLED
Screen area
  • 83.4 cm2
  • 79.6 cm2
Screen format
  • 16:9 (height:width)
  • 18.5:9 (height:width)
Screen to body ratio
  • 70.3%
  • 75.0%
PPI /points per inch/
  • 401 PPI
  • 441 PPI
Screen protection
  • Corning Gorilla Glass 5
  • Asahi Dragontrail Glass
Camera and Video

Scores marked * are historical catalogue entries. Test conditions are unspecified; no new testing is implied.

Camera and Video — specifications for Zenfone 4 Pro ZS551KL, Pixel 3a.
SpecificationZenfone 4 Pro ZS551KLPixel 3a
Rear camera, main
  • 12 MP
  • Dual
  • 12.2 MP
  • Single
Camera specs
  • 12 MP
  • f/1.7
  • 25mm (wide)
  • 1/2.55''
  • 1.4µm
  • 4-axis OIS
  • dual pixel PDAF & laser AF -16 MP
  • 50mm (telephoto)
  • 1/3.1''
  • 1.0µm
  • 2x optical zoom
  • AF
  • 12.2 MP
  • f/1.8
  • 28mm (wide)
  • 1/2.55''
  • 1.4µm
  • OIS
  • dual pixel PDAF
Functions
  • HDR
  • HDR
Video
  • 1080p@30fps
  • 1080p@30fps
Front camera, selfie
  • 8 MP
  • Single
  • 8 MP
  • Single
Specifications
  • 8 MP
  • f/1.9
  • 1/3.2''
  • 22mm (wide)
  • 1.4µm
  • PDAF
  • 8 MP
  • f/2.0
  • 24mm (wide)
  • 1.12µm
DxOMark Main Score * Unknown
  • 101
DxOMark Photo * Unknown
  • 104
DxOMark Video * Unknown
  • 95
Performance

Scores marked * are historical catalogue entries. Test conditions are unspecified; no new testing is implied.

Performance — specifications for Zenfone 4 Pro ZS551KL, Pixel 3a.
SpecificationZenfone 4 Pro ZS551KLPixel 3a
Processor CPU
  • Octa-core (4x2.45 GHz Kryo & 4x1.9 GHz Kryo)
  • Octa-core (2x2.0 GHz 360 Gold & 6x1.7 GHz Kryo 360 Silver)
Graphics processor GPU
  • Adreno 540
  • Adreno 615
Antutu 7 score * Unknown
  • 159213
GeekBench 4 Single Core * Unknown
  • 1603
GeekBench 4 Multi-Core * Unknown
  • 5206
GeekBench 4 RenderScript * Unknown
  • 6426
GeekBench 4 Battery * Unknown
  • 4895
GeekBench 5 Single Core * Unknown
  • 345
GeekBench 5 Multi-Core * Unknown
  • 1300
General specs
General specs — specifications for Zenfone 4 Pro ZS551KL, Pixel 3a.
SpecificationZenfone 4 Pro ZS551KLPixel 3a
Release date
  • 2017
  • August
  • 2019
  • May
Colors
  • Moonlight White
  • Pure Black
  • Just Black
  • Clearly White
  • Purple-ish
Historical recorded price Legacy catalogue value; date unknown. Not a current offer.
  • 390 EUR
  • 400 EUR
Battery life
  • Talking time- Up to 27 h 30 min (3G)
Unknown
Body build
  • Front/back glass (Gorilla Glass 5) & aluminum frame
  • Front glass
  • plastic body
Communication and Connectivity
Communication and Connectivity — specifications for Zenfone 4 Pro ZS551KL, Pixel 3a.
SpecificationZenfone 4 Pro ZS551KLPixel 3a
SIM card
  • Hybrid Dual SIM (Nano-SIM
  • dual stand-by)
  • Nano-SIM
Network
  • Show all network frequencies: -2G - GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 -3G - HSDPA 800 / 850 / 900 / 1700(AWS) / 1800 / 1900 / 2100 -4G - LTE band 1(2100)
  • 2(1900)
  • 3(1800)
  • 4(1700/2100)
  • 5(850)
  • 7(2600)
  • 8(900)
  • 17(700)
  • 19(800)
  • 20(800)
  • 28(700)
  • 38(2600)
  • 39(1900)
  • 40(2300)
  • 41(2500) - Global
  • Taiwan LTE band 1(2100)
  • 12(700)
  • 18(800)
  • 26(850)
  • 29(700)
  • 30(2300)
  • 41(2500) - US
  • Canada
  • Brazil LTE band 1(2100)
  • 41(2500) - India
  • Show all network frequencies: -2G - GSM 850 / 900 / 1800 / 1900 CDMA 800 / 1900 -3G - HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 CDMA2000 1xEV-DO -4G - LTE band 1(2100)
  • 2(1900)
  • 3(1800)
  • 4(1700/2100)
  • 5(850)
  • 7(2600)
  • 8(900)
  • 12(700)
  • 13(700)
  • 17(700)
  • 20(800)
  • 25(1900)
  • 26(850)
  • 28(700)
  • 32(1500)
  • 38(2600)
  • 40(2300)
  • 41(2500)
  • 66(1700/2100)
Speed
  • HSPA 42.2/5.76 Mbps
  • LTE-A (3CA) Cat12 600/150 or 100 Mbps
  • HSPA 42.2/5.76 Mbps
  • LTE-A (3CA) Cat11 600/75 Mbps
GPRS
  • Yes
  • Yes
Edge
  • Yes
  • Yes
Wi-Fi
  • Wi-Fi 802.11 a/b/g/n/ac
  • dual-band
  • WiFi Direct
  • hotspot
  • Wi-Fi 802.11 a/b/g/n/ac
  • dual-band
  • Wi-Fi Direct
  • hotspot
GPS
  • Yes
  • with A-GPS
  • GLONASS
  • BDS
  • GALILEO
  • Yes
  • with A-GPS
  • GLONASS
  • GALILEO
USB
  • Type-C 1.0 reversible connector
  • 2.0
  • Type-C 1.0 reversible connector
Bluetooth
  • 5.0
  • A2DP
  • EDR
  • LE
  • aptX
  • 5.0
  • A2DP
  • LE
  • aptX HD
Music and Audio
Music and Audio — specifications for Zenfone 4 Pro ZS551KL, Pixel 3a.
SpecificationZenfone 4 Pro ZS551KLPixel 3a
Radio
  • FM radio
Unknown
Others
  • 24-bit/192kHz audio -DTS sound -Active noise cancellation with dedicated mic
  • Always-on display
  • Active noise cancellation with dedicated mic
Other features
Other features — specifications for Zenfone 4 Pro ZS551KL, Pixel 3a.
SpecificationZenfone 4 Pro ZS551KLPixel 3a
Dop
  • Sensors Fingerprint (front-mounted)
  • accelerometer
  • gyro
  • proximity
  • compass
  • color spectrum
  • Infrared port - Fast battery charging: 50% in 32 min
  • Sensors Fingerprint (rear-mounted)
  • accelerometer
  • gyro
  • proximity
  • compass
  • barometer - Fast battery charging 18W -USB Power Delivery 2.0 - Versions: G020A
  • G020E
  • G020B