Screen size
Harmony5.3"
K31Winner: 5.7"+7%
Quick verdict
K31 leads the measured specs 9-2.
Measured wins
Harmony
2
spec wins
Ties
6
equal specs
K31
9
spec wins
Overall winner
Screen size
Technology
Harmony
GSM / HSPA / LTE
K31
GSM / CDMA / HSPA / LTE
2G bands
Harmony
GSM 850 / 900 / 1800 / 1900
K31
GSM 850 / 900 / 1800 / 1900 , CDMA 800 / 1900
3G bands
Harmony
HSDPA 850 / 1700(AWS) / 1900
K31
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
4G bands
Harmony
2, 4, 5, 12
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
RAM
Storage
Main camera
Front camera
equal specsBattery
Wired charging
Weight
Thickness
IP rating
Wi‑Fi
Bluetooth
USB
equal specs5G support
equal specsNFC
equal specs3.5mm jack
equal specsSD card
equal specsStereo speakers
K31
2, 4, 5, 12, 13, 25, 26, 41, 66, 71
Speed
Harmony
HSPA 42.2/5.76 Mbps, LTE (2CA) Cat6 300/50 Mbps
K31
HSPA, LTE
Announced
Harmony
2017, April. Released 2017, April
K31
2020, August 21. Released 2020, August 21
Status
Harmony
Discontinued
K31
Discontinued
Dimensions
Harmony
149.9 x 76.2 x 7.6 mm (5.90 x 3.00 x 0.30 in)
K31
147.8 x 71.1 x 8.6 mm (5.82 x 2.80 x 0.34 in)
Weight
Harmony
141.8 g (5.01 oz)
K31
146 g (5.15 oz)
SIM
Harmony
Nano-SIM
K31
Nano-SIM + Nano-SIM
Other
Harmony
-
K31
MIL-STD-810G compliant* *does not guarantee ruggedness or use in extreme conditions
Type
Harmony
IPS LCD
K31
IPS LCD
Size
Harmony
5.3 inches, 77.4 cm2 (~67.8% screen-to-body ratio)
K31
5.7 inches, 81.1 cm2 (~77.2% screen-to-body ratio)
Resolution
Harmony
720 x 1280 pixels, 16:9 ratio (~277 ppi density)
K31
720 x 1520 pixels, 19:9 ratio (~295 ppi density)
OS
Harmony
Android 7.0 (Nougat)
K31
Android 10, LG UX 9.1
Chipset
Harmony
Qualcomm MSM8917 Snapdragon 425 (28 nm)
K31
Mediatek MT6762 Helio P22 (12 nm)
CPU
Harmony
Quad-core 1.4 GHz Cortex-A53
K31
Octa-core 2.0 GHz Cortex-A53
GPU
Harmony
Adreno 308
K31
PowerVR GE8320
Card slot
Harmony
microSDXC (dedicated slot)
K31
microSDXC
Internal
Harmony
16GB 1.5GB RAM
K31
32GB 2GB RAM
Other
Harmony
eMMC 5.1
K31
eMMC 5.1
Single
Harmony
8 MP, AF
K31
-
Features
Harmony
LED flash, HDR
K31
LED flash, panorama, HDR
Video
Harmony
1080p@30fps
K31
1080p@30fps
Dual
Harmony
-
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
Single
Harmony
5 MP
K31
5 MP, f/2.2, 24mm (wide), 1/5.0", 1.12µm
Video
Harmony
K31
1080p@30fps
Loudspeaker
Harmony
Yes
K31
Yes
3.5mm jack
Harmony
Yes
K31
Yes
WLAN
Harmony
Wi-Fi 802.11 b/g/n, Wi-Fi Direct
K31
Wi-Fi 802.11 b/g/n, Wi-Fi Direct
Bluetooth
Harmony
4.2, A2DP, LE
K31
5.0, A2DP, LE
Positioning
Harmony
GPS
K31
GPS
NFC
Harmony
No
K31
No
Radio
Harmony
Yes
K31
No
USB
Harmony
microUSB 2.0
K31
microUSB 2.0
Sensors
Harmony
Accelerometer, proximity, compass
K31
Fingerprint (rear-mounted), accelerometer
Type
Harmony
Li-Ion 2800 mAh, removable
K31
Li-Ion 3000 mAh
Stand-by
Harmony
Up to 350 h (3G)
K31
-
Talk time
Harmony
Up to 14 h (3G)
K31
-
Colors
Harmony
Black
K31
Gray
Models
Harmony
M257
K31
LM-K300Q, LMK300, LGL355DL
Price
Harmony
About 90 EUR
K31
About 130 EUR