Screen size
RobbyWinner: 5.5"+0.9%
Y515.5"
Quick verdict
Robby leads the measured specs 6-3.
Measured wins
Robby
6
spec wins
Overall winner
Ties
9
equal specs
Y51
3
spec wins
Screen size
Technology
Robby
GSM / HSPA
Y51
GSM / HSPA
2G bands
Robby
GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
Y51
GSM 850 / 900 / 1800 / 1900
3G bands
Robby
HSDPA 900 / 1900 / 2100
Y51
HSDPA 850 / 900 / 1900 / 2100
Speed
Robby
HSPA 21.1/5.76 Mbps
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
equal specsRAM
equal specsStorage
Main camera
Front camera
equal specsBattery
equal specsWired charging
Weight
Thickness
IP rating
Wi‑Fi
Bluetooth
USB
equal specs5G support
equal specsNFC
equal specs3.5mm jack
equal specsSD card
equal specsStereo speakers
Y51
HSPA 42.2/5.76 Mbps
Announced
Robby
2016, February. Released 2016, May
Y51
2021, January 14
Status
Robby
Discontinued
Y51
Available. Released 2021, January 14
Dimensions
Robby
155 x 79.1 x 10 mm (6.10 x 3.11 x 0.39 in)
Y51
146.6 x 72.3 x 9 mm (5.77 x 2.85 x 0.35 in)
Weight
Robby
185 g (6.53 oz)
Y51
175 g (6.17 oz)
SIM
Robby
Dual SIM (Micro-SIM, dual stand-by)
Y51
Nano-SIM + Micro-SIM
Type
Robby
IPS LCD
Y51
TN LCD
Size
Robby
5.5 inches, 83.4 cm2 (~68.0% screen-to-body ratio)
Y51
5.45 inches, 76.7 cm2 (~72.3% screen-to-body ratio)
Resolution
Robby
720 x 1280 pixels, 16:9 ratio (~267 ppi density)
Y51
480 x 960 pixels, 18:9 ratio (~197 ppi density)
OS
Robby
Android 6.0.1 (Marshmallow)
Y51
Android 10 (Go edition)
Chipset
Robby
Mediatek MT6580M (28 nm)
Y51
-
CPU
Robby
Quad-core 1.3 GHz Cortex-A7
Y51
Quad-core 1.3 GHz Cortex-A7
GPU
Robby
Mali-400MP2
Y51
Mali-T820 MP1
Card slot
Robby
microSDXC
Y51
microSDXC
Internal
Robby
16GB 1GB RAM
Y51
8GB 1GB RAM, 16GB 1GB RAM
Single
Robby
8 MP, f/2.0, 1/4.0", 1.12µm
Y51
5 MP
Features
Robby
LED flash, panorama, HDR
Y51
LED flash, HDR
Video
Robby
1080p@30fps
Y51
720p@30fps
Single
Robby
5 MP, f/2.4, 1/5.0", 1.1µm
Y51
5 MP
Features
Robby
LED flash
Y51
-
Video
Robby
Y51
Loudspeaker
Robby
Yes, with stereo speakers
Y51
Yes
3.5mm jack
Robby
Yes
Y51
Yes
WLAN
Robby
Wi-Fi 802.11 b/g/n, Wi-Fi Direct
Y51
Wi-Fi 802.11 b/g/n
Bluetooth
Robby
4.0, A2DP
Y51
4.2, A2DP
Positioning
Robby
GPS
Y51
GPS
NFC
Robby
No
Y51
No
Radio
Robby
FM radio
Y51
FM Radio
USB
Robby
microUSB 2.0, OTG
Y51
microUSB 2.0
Sensors
Robby
Accelerometer, proximity
Y51
Accelerometer, proximity
Type
Robby
Li-Po 2500 mAh, removable
Y51
Li-Ion 2500 mAh, removable
Stand-by
Robby
Up to 270 h (2G) / Up to 270 h (3G)
Y51
-
Talk time
Robby
Up to 17 h (2G) / Up to 15 h (3G)
Y51
-
Colors
Robby
Space Grey, Gold, Bleen, Rose Gold, Lime
Y51
Deep Grey, Gold, Mint
Models
Robby
ROBBY
Y51
W-K211-TH
SAR EU
Robby
0.30 W/kg (head) 0.46 W/kg (body)
Y51
-
SAR
Robby
-
Y51
0.70 W/kg (head) 1.55 W/kg (body)
Price
Robby
-
Y51
About 70 EUR