Screen size
K31Winner: 5.7"+7%
X4+5.3"
Quick verdict
K31 leads the measured specs 6-1.
Measured wins
K31
6
spec wins
Overall winner
Ties
10
equal specs
X4+
1
spec wins
Screen size
Technology
K31
GSM / CDMA / HSPA / LTE
X4+
GSM / HSPA / LTE
2G bands
K31
GSM 850 / 900 / 1800 / 1900 , CDMA 800 / 1900
X4+
GSM 850 / 900 / 1800 / 1900
3G bands
K31
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
X4+
HSDPA 850 / 900 / 1900 / 2100
4G bands
K31
2, 4, 5, 12, 13, 25, 26, 41, 66, 71
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
RAM
equal specsStorage
equal specsMain camera
equal specsFront camera
equal specsBattery
equal specsWired charging
Weight
Thickness
equal specsIP rating
Wi‑Fi
Bluetooth
USB
equal specs5G support
equal specsNFC
3.5mm jack
equal specsSD card
equal specsStereo speakers
X4+
1, 3, 5, 7, 8, 28, 38
Speed
K31
HSPA, LTE
X4+
HSPA, LTE
Announced
K31
2020, August 21. Released 2020, August 21
X4+
2018, January. Released 2018, February
Status
K31
Discontinued
X4+
Discontinued
Dimensions
K31
147.8 x 71.1 x 8.6 mm (5.82 x 2.80 x 0.34 in)
X4+
148.6 x 75.1 x 8.6 mm (5.85 x 2.96 x 0.34 in)
Weight
K31
146 g (5.15 oz)
X4+
172.3 g (6.07 oz)
SIM
K31
Nano-SIM + Nano-SIM
X4+
Nano-SIM + Nano-SIM
Other
K31
MIL-STD-810G compliant* *does not guarantee ruggedness or use in extreme conditions
X4+
MIL-STD-810G compliant* *does not guarantee ruggedness or use in extreme conditions
Type
K31
IPS LCD
X4+
IPS LCD
Size
K31
5.7 inches, 81.1 cm2 (~77.2% screen-to-body ratio)
X4+
5.3 inches, 77.4 cm2 (~69.4% screen-to-body ratio)
Resolution
K31
720 x 1520 pixels, 19:9 ratio (~295 ppi density)
X4+
720 x 1280 pixels, 16:9 ratio (~277 ppi density)
OS
K31
Android 10, LG UX 9.1
X4+
Android 7.0 (Nougat)
Chipset
K31
Mediatek MT6762 Helio P22 (12 nm)
X4+
Qualcomm MSM8917 Snapdragon 425 (28 nm)
CPU
K31
Octa-core 2.0 GHz Cortex-A53
X4+
Quad-core 1.4 GHz Cortex-A53
GPU
K31
PowerVR GE8320
X4+
Adreno 308
Card slot
K31
microSDXC
X4+
microSDXC
Internal
K31
32GB 2GB RAM
X4+
32GB 2GB RAM
Other
K31
eMMC 5.1
X4+
eMMC 5.1
Dual
K31
13 MP, f/1.8, 27mm (wide), 1/3.1", 1.12µm, PDAF 5 MP, f/2.2, 120˚ (ultrawide), 1/5.0", 1.12µm
X4+
-
Features
K31
LED flash, panorama, HDR
X4+
LED flash, HDR
Video
K31
1080p@30fps
X4+
1080p@30fps
Single
K31
-
X4+
13 MP, f/2.2, 1/3.1", 1.12µm, AF
Single
K31
5 MP, f/2.2, 24mm (wide), 1/5.0", 1.12µm
X4+
5 MP, f/2.4, 1/5.0", 1.12µm
Video
K31
1080p@30fps
X4+
1080p@30fps
Loudspeaker
K31
Yes
X4+
Yes
3.5mm jack
K31
Yes
X4+
Yes
Other
K31
-
X4+
32-bit/192kHz Hi-Res audio
WLAN
K31
Wi-Fi 802.11 b/g/n, Wi-Fi Direct
X4+
Wi-Fi 802.11 a/b/g/n, dual-band, Wi-Fi Direct
Bluetooth
K31
5.0, A2DP, LE
X4+
4.2, A2DP, LE
Positioning
K31
GPS
X4+
GPS
NFC
K31
No
X4+
Yes
Radio
K31
No
X4+
FM radio
USB
K31
microUSB 2.0
X4+
microUSB 2.0
Sensors
K31
Fingerprint (rear-mounted), accelerometer
X4+
Fingerprint (rear-mounted), accelerometer, proximity, compass
Type
K31
Li-Ion 3000 mAh
X4+
Li-Ion 3000 mAh, non-removable
Colors
K31
Gray
X4+
Lavender Violet, Moroccan Blue
Models
K31
LM-K300Q, LMK300, LGL355DL
X4+
LM-X415L, LM-X410L, LM-X415S
Price
K31
About 130 EUR
X4+
About 200 EUR