Screen size
K50S6.5"
K51SWinner: 6.6"+0.8%
Quick verdict
K51S leads the measured specs 6-1.
Measured wins
K50S
1
spec wins
Ties
10
equal specs
K51S
6
spec wins
Overall winner
Screen size
Technology
K50S
GSM / HSPA / LTE
K51S
GSM / HSPA / LTE
2G bands
K50S
GSM 850 / 900 / 1800 / 1900
K51S
GSM 850 / 900 / 1800 / 1900
3G bands
K50S
HSDPA 850 / 900 / 1900 / 2100
K51S
HSDPA 850 / 900 / 1900 / 2100
4G bands
K50S
1, 3, 7, 8, 20
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
RAM
equal specsStorage
Main camera
Front camera
equal specsBattery
equal specsWired charging
Weight
equal specsThickness
IP rating
Wi‑Fi
Bluetooth
equal specsUSB
equal specs5G support
equal specsNFC
equal specs3.5mm jack
equal specsSD card
equal specsStereo speakers
K51S
1, 3, 7, 8, 20, 28, 38
Speed
K50S
HSPA 42.2/5.76 Mbps, LTE (2CA) Cat6 300/50 Mbps
K51S
HSPA 42.2/5.76 Mbps, LTE (2CA) Cat6 300/50 Mbps
Announced
K50S
2019, August. Released 2019, September
K51S
2020, February 18. Released 2020, April 27
Status
K50S
Discontinued
K51S
Discontinued
Dimensions
K50S
165.8 x 77.5 x 8.2 mm (6.53 x 3.05 x 0.32 in)
K51S
165.2 x 76.7 x 8.3 mm (6.50 x 3.02 x 0.33 in)
Weight
K50S
194 g (6.84 oz)
K51S
194.5 g (6.88 oz)
SIM
K50S
· Nano-SIM· Nano-SIM + Nano-SIM
K51S
· Nano-SIM· Nano-SIM + Nano-SIM
Other
K50S
MIL-STD-810G compliant* *does not guarantee ruggedness or use in extreme conditions
K51S
MIL-STD-810G compliant* *does not guarantee ruggedness or use in extreme conditions
Type
K50S
IPS LCD
K51S
IPS LCD
Size
K50S
6.5 inches, 105.5 cm2 (~82.1% screen-to-body ratio)
K51S
6.55 inches, 93.6 cm2 (~73.8% screen-to-body ratio)
Resolution
K50S
720 x 1520 pixels, 19:9 ratio (~259 ppi density)
K51S
720 x 1600 pixels, 20:9 ratio (~282 ppi density)
Protection
K50S
-
K51S
Scratch-resistant glass
OS
K50S
Android 9.0 (Pie)
K51S
Android 9.0 (Pie)
Chipset
K50S
Mediatek MT6762 Helio P22 (12 nm)
K51S
Mediatek MT6765 Helio P35 (12 nm)
CPU
K50S
Octa-core 2.0 GHz Cortex-A53
K51S
Octa-core (4x2.3 GHz Cortex-A53 & 4x1.8 GHz Cortex-A53)
GPU
K50S
PowerVR GE8320
K51S
PowerVR GE8320
Card slot
K50S
microSDXC (dedicated slot)
K51S
microSDXC (dedicated slot)
Internal
K50S
32GB 3GB RAM
K51S
64GB 3GB RAM
Other
K50S
eMMC 5.1
K51S
eMMC 5.1
Triple
K50S
13 MP, f/2.2, 26mm (wide), PDAF 5 MP, f/2.2, 115˚ (ultrawide) Auxiliary lens
K51S
-
Features
K50S
LED flash, panorama, HDR
K51S
LED flash, panorama, HDR
Video
K50S
1080p@30fps
K51S
1080p@30fps
Quad
K50S
-
K51S
32 MP, (wide), PDAF 5 MP, f/2.2, 115˚, (ultrawide) 2 MP (macro) Auxiliary lens
Single
K50S
13 MP, f/2.0, 1/3.1", 1.12µm
K51S
13 MP, 1/3.1", 1.12µm
Video
K50S
1080p@30fps
K51S
1080p@30fps
Loudspeaker
K50S
Yes
K51S
Yes
3.5mm jack
K50S
Yes
K51S
Yes
WLAN
K50S
Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, DLNA
K51S
Wi-Fi 802.11 a/b/g/n, Wi-Fi Direct, DLNAorWi-Fi 802.11 b/g/n, Wi-Fi Direct, DLNA
Bluetooth
K50S
5.0, A2DP, LE
K51S
5.0, A2DP, LE
Positioning
K50S
GPS, GLONASS
K51S
GPS
NFC
K50S
Yes (market/region dependent)
K51S
Yes
Radio
K50S
FM radio
K51S
No
USB
K50S
USB Type-C 2.0, OTG
K51S
USB Type-C 2.0, OTG
Sensors
K50S
Fingerprint (rear-mounted), accelerometer, proximity
K51S
Fingerprint (rear-mounted), accelerometer, proximity, compass
Type
K50S
Li-Po 4000 mAh, non-removable
K51S
Li-Po 4000 mAh
Colors
K50S
New Aurora Black, New Moroccan Blue
K51S
Titanium, Pink, Blue, Red
Models
K50S
LMX540HM, LM-X540, LM-X540BMW, LMX540BMW
K51S
LMK510EMW, LM-K510EMW, LM-K510
Price
K50S
About 200 EUR
K51S
About 200 EUR