Ulefone Armor X31
#2145
vivo Y55s (2021)
#2543Category Breakdown
Ulefone Armor X31
vivo Y55s (2021)
Performance
79.584.1
Camera
36.819.1
Display
78.058.9
Battery
38.137.7
Build
0.265.8
Connectivity
67.477.6
Audio
8.98.9
Overall
51.448.1
Summary
- The Ulefone Armor X31 features a rugged build with a weight of 305.5g and dimensions of 173.8 x 82 x 13.7 mm, while the vivo Y55s (2021) has a lighter and slimmer design at 199.8g and 163.9 x 75.3 x 9.2 mm, utilizing glass and plastic materials.
- The Armor X31's 6.56-inch IPS LCD display offers a 720 x 1612 resolution at 90Hz, compared to the Y55s's 6.58-inch IPS LCD with a higher 1080 x 2408 resolution at 60Hz.
- In terms of performance, the Armor X31 is powered by the Mediatek Helio G91, while the Y55s utilizes the more advanced Mediatek Dimensity 700.
- The camera system on the Armor X31 includes a 48 MP main sensor and a 16 MP selfie camera, whereas the Y55s has a 50 MP rear camera and an 8 MP front camera.
- Both devices have similar battery capacities, with the Armor X31 at 6050 mAh and the Y55s at 6000 mAh, and both support 18W charging.
- The Armor X31 runs on Android 14, while the Y55s operates on Android 11 with OriginOS.
Side-by-side Specification Comparison
Ulefone Armor X31
vivo Y55s (2021)
General
Release Date
2025
2021, December 04
Announced
2025
2021, December 04
Description
N/A
N/A
Display
Size
6.56"
6.58"
Type
IPS LCD, 90Hz, 600 nits
IPS LCD
Resolution
720 x 1612 pixels, 20:9 ratio (~269 ppi density)
1080 x 2408 pixels, 20:9 ratio (~401 ppi density)
PPI
720
1080
Refresh Rate
90Hz
60Hz
HDR Support
✗
✗
Protection
Corning Gorilla Glass 5
N/A
Performance
Chipset
Mediatek Helio G91 (12 nm)
Mediatek Dimensity 700 (7 nm)
CPU
Octa-core (2x2.0 GHz Cortex-A75 & 6x1.8 GHz Cortex-A55)
Octa-core (2x2.2 GHz Cortex-A76 & 6x2.0 GHz Cortex-A55)
GPU
Mali-G52 MC2
Mali-G57 MC2
Memory
128GB 6GB RAM
128GB 6GB RAM, 128GB 8GB RAM, 256GB 8GB RAM
Expandable Storage
✗
✗
Card Slot
microSDXC (dedicated slot)
No
Camera
Main Camera
48 MP, f/1.8, (wide), 0.8µm, PDAF20 MP, f/1.8, (night vision), 2 infrared lights2 MP, (macro)
50 MP, f/1.8, 26mm (wide), PDAF2 MP, f/2.4, (macro)
Main Camera Features
LED flash, HDR, panorama
LED flash, HDR, panorama
Front Camera
16 MP, f/2.3, (wide), 1.0µm
8 MP, f/1.8, (wide)
Front Camera Features
N/A
N/A
Video Recording
1440p@30fps, 1080p@30fps
1080p@30fps
Selfie Video
1080p@30fps
1080p@30fps
Optical Stabilization
✗
✗
Night Mode
✗
✗
Raw Photo Support
✗
✗
Battery
Capacity
6050 mAh
6000 mAh
Battery Details
Li-Po 6050 mAh
6000 mAh
Charging Details
18W wired
18W wired
Fast Charging
✗
✗
Wireless Charging
✗
✗
Build & Safety
Dimensions
173.8 x 82 x 13.7 mm (6.84 x 3.23 x 0.54 in)
163.9 x 75.3 x 9.2 mm (6.45 x 2.96 x 0.36 in)
Weight
305.5 g
199.8 g
Materials
N/A
Glass front, plastic frame, plastic back
Colors
Black, Black/Orange, Black/Green
Black, Blue, Pink
Foldable
✗
✗
SAR
N/A
N/A
Connectivity
SIM
Nano-SIM + Nano-SIM
Nano-SIM + Nano-SIM
Network
GSM / CDMA / HSPA / LTE
GSM / CDMA / HSPA / CDMA2000 / LTE / 5G
Network Speed
HSPA, LTE
HSPA, LTE, 5G
5G
✗
✓
4G
✓
✓
WiFi
Wi-Fi 802.11 a/b/g/n/ac, dual-band
Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct
Bluetooth
5.2, A2DP, LE
5.1, A2DP, LE, aptX HD
NFC
✓
✗
USB
USB Type-C 2.0, OTG
USB Type-C, OTG
IR Blaster
✗
✗
Headphone Jack
✓
✓
Radio
✗
✗
Positioning
GPS, GLONASS, GALILEO, BDS
GPS, GLONASS, GALILEO, BDS, QZSS
Audio
Stereo Speakers
✗
✗
Loudspeaker
Yes
Yes
Audio Jack
Yes
Yes
Software & Security
Operating System
Android 14
Android 11, OriginOS
Fingerprint
✓
✓
Face Unlock
✗
✗
Sensors
Fingerprint (side-mounted), accelerometer, gyro, proximity, compass, barometer
Fingerprint (side-mounted), accelerometer, proximity, compass