Samsung Galaxy A9 (2018) vs vivo X21 Specs Comparison

Availability

Officially announced
Oct 11, 2018

Design

Dimensions
6.40 x 3.03 x 0.31 inches 162.5 x 77 x 7.8 mm	6.08 x 2.94 x 0.29 inches 154.45 x 74.78 x 7.37 mm
Weight
6.46 oz / 183.0 g	5.51 oz / 156.2 g
Materials
Back: Glass Frame: Metal	Back: Aluminum Frame: Aluminum
Biometrics
2D Face unlock, Fingerprint (touch)	2D Face unlock, Optical in-screen fingerprint
Keys
Left: Other; Right: Volume control, Lock/Unlock key; Back: Other	Right: Volume control, Lock/Unlock key
Colors
Caviar black, Lemonade blue, Bubblegum pink	Black

Display

Size
6.3-inch, 80.51% screen-to-body	6.3-inch, 85.36% screen-to-body
Type
Super AMOLED	Super AMOLED
Resolution
2220x1080px, 18.5:9 ratio, 392 PPI	2280x1080px, 402 PPI

PhoneArena Display Test

Bright Max (20% APL)
Untested	Untested
Bright Min
1 (Excellent)	Untested

Learn more on our PhoneArena Display Test Results page.

Hardware

System chip
Snapdragon 660 SDM660 (14 nm)	Snapdragon 660 SDM660 (14 nm)
Processor
Octa-core 2200 MHz Kryo 260	Octa-core 2200 MHz Kryo 260
GPU
Adreno 512	Adreno 512
Memory
6GB (LPDDR4)/128GB	6GB (LPDDR4)/128GB
Storage expansion
microSDXC up to 512 GB	microSDXC up to 256 GB
OS
Android (10, 9.0 Pie, 8.0 Oreo)	Android (8.1 Oreo)

Battery

Type
3800 mAh, Li - Polymer	3200 mAh, Li - Ion
Charging
Samsung Adaptive Fast Charging	Fast charging

Camera

Rear
Quad camera	Dual camera
Main camera
24 MP (PDAF) Aperture size: F1.7 Focal length: 27 mm Sensor size: 1/2.8" Pixel size: 0.9 μm	12 MP (PDAF) Aperture size: F1.8 Sensor size: 1/2.8" Pixel size: 1.28 μm
Second camera
8 MP (Ultra-wide) Aperture size: F2.4 Focal Length: 12 mm Sensor size: 1/4" Pixel size: 1.12 μm	5 MP (Depth information) Aperture size: F2.4
Third camera
8 MP (Telephoto, Autofocus) Optical zoom: 2.0x Aperture size: F2.4 Focal Length: 52 mm Sensor size: 1/3.9" Pixel size: 1 μm
Fourth camera
5 MP (Depth information) Aperture size: F2.2 Focal Length: 24 mm Sensor size: 1/5" Pixel size: 1.12 μm
Flash
LED	LED
Video recording
4K UHD (30 fps), 1080p (30 fps) Hyperlapse, Continuous autofocus, EIS, Video calling, Video sharing	1080p (30 fps) Time-lapse video, Video calling, Video sharing
Front
24 MP Video capture: 1080p	12 MP Video capture: 1080p

Connectivity & Features

Bluetooth
5.0	5.0
WLAN
a,b,g,n,ac,dual-band MIMO, Wi-Fi Direct, Hotspot 802.11 a, b, g, n, ac	a,b,g,n,ac,dual-band Wi-Fi Direct, Hotspot 802.11 a, b, g, n, ac
USB
Type-C, USB 2.0	microUSB, USB 2.0
Sensors
Accelerometer, Gyroscope, Compass, Hall (for flip covers), Ambient light sensor, Proximity sensor	Accelerometer, Gyroscope, Compass, Ambient light sensor, Proximity sensor
Location
GPS, A-GPS, Glonass, Galileo, BeiDou	GPS, A-GPS, Glonass
Other
NFC, ANT+, VoIP, Tethering, Computer sync, OTA sync	VoIP, Tethering, Computer sync, OTA sync

Multimedia

Headphones
3.5mm jack	3.5mm jack
Speakers
Earpiece, Loudspeaker	Earpiece, Loudspeaker
Features
Album art cover, Background playback	Album art cover, Background playback
Screen mirroring
Wireless screen share	Wireless screen share
Radio
FM	FM
Additional microphone(s)
	Noise cancellation

Cellular

4G (FDD) Bands
1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 20, 26, 28, 66	1, 3, 5
4G (TDD) Bands
38, 40, 41	40, 41
3G Bands
1, 2, 4, 5, 8	5, 8, 1
Data Speed
LTE-A Cat 9 (450/50 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA, UMTS	LTE-A Cat 6 (300/50 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s
Dual SIM
	Yes
SIM type
Nano SIM	Nano SIM

Regulatory Approval

FCC approval
Date approved: Oct 18, 2018 FCC ID value: A3LSMA920F
Measured SAR
Head: 0.24 W/kg Body: 0.84 W/kg Simultaneous Transmission: 1.58 W/kg Wireless Router: 1.40 W/kg Phablet: 3.95 W/kg	Head: 1.18 W/kg Body: 0.57 W/kg

Alternative variants

Dual SIM

Dual SIM	Yes

Links

Full specifications
Samsung Galaxy A9 (2018) Specs	vivo X21 Specs
PhoneArena Review
Samsung Galaxy A9 (2018) Review
User Reviews
Samsung Galaxy A9 (2018) User Reviews