vivo Y91
#3986
Xiaomi Mi 4i
#4040Category Breakdown
vivo Y91
Xiaomi Mi 4i
Performance
60.360.3
Camera
42.442.4
Display
70.570.5
Battery
43.543.5
Build
79.879.8
Overall
57.357.3
Summary
- The vivo Y91 features a larger 6.22-inch IPS LCD display with a resolution of 720 x 1520 pixels, while the Xiaomi Mi 4i has a 5.0-inch IPS LCD with a higher resolution of 1080 x 1920 pixels, resulting in a sharper image.
- In terms of performance, the Y91 is powered by a Snapdragon 439 chipset, while the Mi 4i uses a Snapdragon 615, which may offer slightly better performance in multi-core tasks.
- Both phones have a 13 MP rear camera, but the Mi 4i has a wider aperture (f/2.0 vs.
- f/2.2) and autofocus, potentially enhancing low-light performance.
- The Y91 has a larger 4030 mAh battery compared to the 3120 mAh battery of the Mi 4i, supporting longer usage.
- For software, the Y91 runs on Android 8.1 with Funtouch 4.5, while the Mi 4i operates on an older Android 5.0.2 with MIUI 8.2, which may affect user experience and app compatibility.
- Both devices have a plastic build, but the Mi 4i includes Gorilla Glass on the front for added durability.
Side-by-side Specification Comparison
vivo Y91
Xiaomi Mi 4i
General
Release Date
2018
2015
Announced
2018
2015
Description
N/A
N/A
Display
Size
6.22"
5"
Type
IPS LCD
IPS LCD
Resolution
720 x 1520 pixels, 19:9 ratio (~270 ppi density)
1080 x 1920 pixels, 16:9 ratio (~441 ppi density)
PPI
720
1080
Refresh Rate
60Hz
60Hz
Peak Brightness
N/A
N/A
HDR Support
✗
✗
Protection
N/A
Corning scratch-resistant glass
Performance
Chipset
Qualcomm SDM439 Snapdragon 439 (12 nm)
Qualcomm MSM8939 Snapdragon 615 (28 nm)
CPU
Octa-core (4x1.95 GHz Cortex-A53 & 4x1.45 GHz Cortex A53)
Octa-core (4x1.7 GHz Cortex-A53 & 4x1.0 GHz Cortex-A53)
GPU
Adreno 505
Adreno 405
Memory
16GB 2GB RAM, 32GB 2GB RAM, 32GB 3GB RAM
16GB 2GB RAM, 32GB 2GB RAM
Expandable Storage
✗
✗
Card Slot
microSDXC (dedicated slot)
No
Camera
Main Camera
13 MP
13 MP
Main Camera Details
13 MP, f/2.2, PDAF2 MP, f/2.4, (depth)
13 MP, f/2.0, AF
Front Camera
8 MP
5 MP
Front Camera Details
8 MP, f/1.8
5 MP, f/1.8
Video Recording
1080p@30fps
1080p@30fps, 480p@120fps
Selfie Video
1080p@30fps
N/A
OIS
✗
✗
Night Mode
✗
✗
RAW Support
✗
✗
Battery
Capacity
4030 mAh
3120 mAh
Battery Details
4030 mAh, non-removable
Li-Ion 3120 mAh, non-removable
Charging Details
N/A
10W wired, QC1
Fast Charging
✗
✗
Wireless Charging
✗
✗
Build & Design
Dimensions
155.1 x 75.1 x 8.3 mm (6.11 x 2.96 x 0.33 in)
138.1 x 69.6 x 7.8 mm (5.44 x 2.74 x 0.31 in)
Weight
163.5 g
130 g
Materials
Glass front, plastic back, plastic frame
Glass front (Gorilla Glass), plastic back, plastic frame
Water Resistance
N/A
N/A
Colors
Starry Black, Ocean Blue
Dark Gray, Black, White, Yellow, Blue, Pink
Foldable
✗
✗
Connectivity
SIM
Nano-SIM + Nano-SIM
Dual SIM (Micro-SIM, dual stand-by)
Network
GSM / HSPA / LTE
GSM / HSPA / LTE
Network Speed
HSPA 42.2/5.76 Mbps, LTE Cat5 150/75 Mbps
HSPA, LTE Cat4 150/50 Mbps
5G
✗
✗
4G
✓
✓
WiFi
Wi-Fi 802.11 b/g/n, Wi-Fi Direct
Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot
Bluetooth
4.2, A2DP, LE
4.1, A2DP
NFC
✗
✗
USB
microUSB 2.0, OTG
microUSB 2.0, OTG
IR Blaster
✗
✗
Headphone Jack
✓
✓
Radio
✗
✗
Positioning
GPS, GLONASS, BDS
GPS, GLONASS, BDS
Software
Operating System
Android 8.1 (Oreo), Funtouch 4.5
Android 5.0.2 (Lollipop), MIUI 8.2
OS Version
Android 8.1 (Oreo), Funtouch 4.5
Android 5.0.2 (Lollipop), MIUI 8.2
Security
Fingerprint
✓
✗
Face Unlock
✗
✗
Sensors
Fingerprint (rear-mounted), accelerometer, proximity, compass
Accelerometer, gyro, proximity, compass
Audio
Stereo Speakers
✗
✗
Loudspeaker
Yes
Yes
Audio Jack
Yes
Yes