Screen size
Blade20Winner: 6.6"+9.1%
S516.0"
Quick verdict
Blade20 leads the measured specs 8-4.
Measured wins
Blade20
8
spec wins
Overall winner
Ties
8
equal specs
S51
4
spec wins
Screen size
Technology
Blade20
GSM / HSPA / LTE
S51
GSM / CDMA / HSPA / LTE
2G bands
Blade20
GSM 850 / 900 / 1800 / 1900
S51
GSM 850 / 900 / 1800 / 1900 , CDMA 800 / 1900
3G bands
Blade20
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
S51
HSDPA 800 / 850 / 900 / 1700(AWS) / 1900 / 2100
4G bands
Blade20
1, 2, 3, 4, 5, 7, 8, 18, 19, 20, 25, 26, 28, 34, 38, 39, 40, 41, 66
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
RAM
equal specsStorage
Main camera
Front camera
equal specsBattery
Wired charging
Weight
Thickness
IP rating
equal specsWi‑Fi
Bluetooth
equal specsUSB
equal specs5G support
equal specsNFC
equal specs3.5mm jack
SD card
equal specsStereo speakers
S51
1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 34, 38, 39, 40, 41, 66
Speed
Blade20
HSPA, LTE
S51
HSPA, LTE
Announced
Blade20
2025, May
S51
2022, September
Status
Blade20
Available. Released 2025, May
S51
Available. Released 2022, September
Dimensions
Blade20
174 x 81.2 x 15.8 mm (6.85 x 3.20 x 0.62 in)
S51
167.4 x 81.4 x 14.6 mm (6.59 x 3.20 x 0.57 in)
Weight
Blade20
327 g (11.53 oz)
S51
-
SIM
Blade20
Nano-SIM + Nano-SIM
S51
Nano-SIM + Nano-SIM
Other
Blade20
IP68/IP69K dust tight and water resistant (high pressure water jets; immersible up to 1.5m for 30 min) MIL-STD-810H compliant
S51
IP68/IP69K dust tight and water resistant (high pressure water jets; immersible up to 1.5m for 30 min) MIL-STD-810G compliant
Type
Blade20
IPS LCD, 90Hz
S51
IPS LCD
Size
Blade20
6.6 inches, 104.6 cm2 (~74.1% screen-to-body ratio)
S51
6.0 inches, 92.9 cm2 (~68.2% screen-to-body ratio)
Resolution
Blade20
720 x 1612 pixels, 20:9 ratio (~267 ppi density)
S51
720 x 1440 pixels, 18:9 ratio (~268 ppi density)
Protection
Blade20
Mohs level 6
S51
Corning Gorilla Glass
OS
Blade20
Android 15
S51
Android 12
Chipset
Blade20
Unisoc T7200 (12 nm)
S51
Mediatek Helio G25 (12 nm)
CPU
Blade20
Octa-core (2x1.6 GHz Cortex-A75 & 6x1.6 GHz Cortex-A55)
S51
Octa-core (4x2.0 GHz Cortex-A53 & 4x1.5 GHz Cortex-A53)
GPU
Blade20
Mali-G57 MP1
S51
PowerVR GE8320
Card slot
Blade20
microSDXC (dedicated slot)
S51
microSDXC (dedicated slot)
Internal
Blade20
128GB 4GB RAM
S51
64GB 4GB RAM
Dual
Blade20
16 MP, (wide), 1/2.8", AF 2 MP (macro)
S51
12 MP, f/1.8, (wide), PDAF Auxiliary lens
Features
Blade20
LED flash, HDR, panorama
S51
Quad-LED flash
Video
Blade20
1080p@30fps
S51
1080p
Single
Blade20
8 MP, f/2.2, (wide), 1/4.0"
S51
8 MP, f/2.0, (wide)
Video
Blade20
720p@30fps
S51
1080p
Loudspeaker
Blade20
Yes
S51
Yes
3.5mm jack
Blade20
No
S51
Yes
WLAN
Blade20
Wi-Fi 802.11 a/b/g/n/ac, dual-band
S51
Wi-Fi 802.11 a/b/g/n/ac, dual-band
Bluetooth
Blade20
5.0, A2DP, LE
S51
5.0, A2DP, LE
Positioning
Blade20
GPS, GLONASS, BDS, GALILEO
S51
GPS, GLONASS, GALILEO, BDS
NFC
Blade20
Yes
S51
Yes
Radio
Blade20
FM radio
S51
FM radio
USB
Blade20
USB Type-C 2.0, OTG
S51
USB Type-C 2.0, OTG
Sensors
Blade20
Fingerprint (side-mounted), accelerometer, gyro, proximity, compass
S51
Accelerometer, proximity, compass
Type
Blade20
10300 mAh
S51
5180 mAh
Charging
Blade20
18W wired
S51
10W wired
Colors
Blade20
Black, Purple, Natural
S51
Black, Green, Orange
Price
Blade20
About 200 EUR
S51
-