Google Pixel 3a vs Samsung Galaxy S21 Ultra Specs Comparison

Compare mobile phone specifications of up to three devices at once. Our specs comparison tool helps you find and compare the perfect phone for your needs.

9.0
Google Pixel 3a
9.1
Samsung Galaxy S21 Ultra
Google Pixel 3a Samsung Galaxy S21 Ultra
Released · May 07, 2019
Released · Jan 29, 2021
5.6-inch · 2220x1080px
6.8-inch · 3200x1440px
Single camera
Quad camera
4GB · 64GB
12GB · 128GB
3000 mAh
5000 mAh
Check prices

Design

Dimensions
5.96 x 2.76 x 0.32 inches
151.3 x 70.1 x 8.2 mm
6.50 x 2.98 x 0.35 inches (~0.37 inches with camera bump)
165.1 x 75.6 x 8.9 mm (~9.4 mm with camera bump)
Weight
5.19 oz (147.0 g) 8.04 oz (229.0 g)
Materials
Back: Plastic Back: Glass (Corning Gorilla Glass Victus)
Frame: Aluminum
Resistance
Water, Dust; IP68
Biometrics
Fingerprint (touch) 2D Face unlock, Ultrasonic in-screen fingerprint
Keys
Right: Volume control, Lock/Unlock key Right: Volume control, Lock/Unlock key
Colors
Black, Purple, White Phantom black, Silver

Display

Size
5.6-inch 6.8-inch
Resolution
2220x1080px, 18.5:9 ratio, 444 PPI 3200x1440px, 20:9 ratio, 516 PPI
Technology
OLED Dynamic AMOLED
Refresh rate
120Hz (adaptable)
Screen-to-body
73.93 % 89.33 %
Peak brightness
1500 cd/m2 (nit)
Features
Scratch-resistant glass (Dragontrail), Ambient light sensor, Proximity sensor HDR support, Scratch-resistant glass (Corning Gorilla Glass Victus), Ambient light sensor, Proximity sensor

Hardware

System chip
Qualcomm Snapdragon 670 SDM670 (10 nm) Qualcomm Snapdragon 888 SM8350 (5 nm)
Processor
Octa-core
2000 MHz
Kryo 360
Octa-core
1x 2.84GHz Kryo 680 + 3x 2.42GHz Kryo 680 + 4x 1.80GHz Kryo 680
GPU
Adreno 615 Adreno 660
Memory
4GB (LPDDR4)/64GB (eMMC) 12GB (LPDDR5)/128GB (UFS 3.1)
Storage expansion
not expandable not expandable
OS
Android (12, 11, 10, 9.0 Pie) Android (14, 13, 12, 11)

Battery

Type
3000 mAh 5000 mAh, Li - Polymer
Charging
USB Power Delivery Qualcomm Quick Charge 2.0, USB Power Delivery, Samsung Adaptive Fast Charging
Qi and Powermat wireless charging, Reverse wireless charging
Charge speed
Wired: 25.0W
Wireless: 15.0W
PhoneArena Battery Tests
Battery Life Estimate
Untested
Browsing
9h 48min
Video
6h 30min
Gaming
Untested
Battery Life Estimate
6h 15min
Browsing
14h 43min
Video
8h 52min
Gaming
8h 40min

Camera

Rear
Single camera Quad camera
Main camera
12.2 MP (OIS, PDAF)
Aperture size: F1.8
Focal length: 28 mm
Sensor size: 1/2.55"
Pixel size: 1.4 μm
108 MP (OIS, Laser and PDAF)
Aperture size: F1.8
Focal length: 24 mm
Sensor size: 1/1.33"
Pixel size: 0.8 μm
Second camera
12 MP (Ultra-wide, PDAF)
Aperture size: F2.2
Focal Length: 13 mm
Sensor size: 1/2.55"
Pixel size: 1.4 μm
Third camera
10 MP (Telephoto, OIS, PDAF)
Optical zoom: 3.0x
Aperture size: F2.4
Focal Length: 70 mm
Sensor size: 1/3.2"
Pixel size: 1.22 μm
Fourth camera
10 MP (Telephoto, Periscope, OIS, PDAF)
Optical zoom: 3.0x
Aperture size: F2.4
Focal Length: 70 mm
Sensor size: 1/3.2"
Pixel size: 1.22 μm
Flash
Dual LED LED
Video recording
4K UHD (30 fps), 1080p (120 fps), 720p (240 fps)
EIS
8K UHD (24 fps), 4K UHD (60 fps), 1080p (240 fps), 720p (960 fps)
OIS, HDR, Hyperlapse, Video light, EIS
Front
8 MP
Video capture: 1080p
40 MP (PDAF, HDR)
Video capture: 4K UHD (60 fps)

Connectivity & Features

Bluetooth
5.0 5.1
WLAN
802.11 a,b,g,n,ac,dual-band
MIMO, Wi-Fi Direct, Hotspot
802.11 a,b,g,n,ac,ax(Wi-Fi 6),dual-band
MIMO, Wi-Fi Direct, Hotspot
USB
Type-C, USB 2.0 Type-C, USB 3.2
Hearing aid compatible
M3/T3 M3/T3
Location
GPS, A-GPS, Glonass, Galileo, Cell ID, Wi-Fi positioning GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning
Sensors
Accelerometer, Gyroscope, Compass, Barometer Accelerometer, Gyroscope, Compass, Hall (for flip covers), Barometer
Other
NFC, VoIP, Tethering, Computer sync, OTA sync NFC, ANT+

Multimedia

Headphones
3.5mm jack No 3.5mm jack
Speakers
Earpiece, Multiple speakers Earpiece, Multiple speakers
Features
aptX-HD 32-Bit DAC, Dolby Atmos, aptX, Dolby Digital, Dolby Digital Plus
Screen mirroring
Wireless screen share Wireless screen share
Radio
FM, Stereo, RDS
Additional microphone(s)
Noise cancellation Noise cancellation, Video recording

Cellular

5G
Bands n2, n5, n12, n25, n41, n66, n71, n77, n260, n261, SA, NSA, Sub-6, mmWave
4G (FDD)
Bands 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 20, 25, 26, 28, 32(1500 L-band), 66(AWS-3) Bands 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 30(2300 WCS), 66(AWS-3), 71(600)
4G (TDD)
Bands 38, 40, 41 Bands 38, 39, 40, 41, 46, 48
3G
Bands 1, 2, 4, 5, 8 Bands 1, 2, 4, 5, 8
Data Speed
LTE-A Cat 11 (600/75 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s LTE-A Pro Cat 20 (2000/150 Mbit/s)
SIM type
Nano SIM Nano SIM
HD Voice
Yes

Regulatory Approval

FCC approval
Date approved: Feb 25, 2019
FCC ID value: A4RG020G
Date approved: Dec 22, 2020
FCC ID value: A3LSMG998U
Measured SAR
Head: 1.15 W/kg
Body: 1.13 W/kg
Simultaneous Transmission: 1.59 W/kg
Wireless Router: 1.19 W/kg
Head: 0.77 W/kg
Body: 1.02 W/kg
Simultaneous Transmission: 1.59 W/kg
Wireless Router: 1.16 W/kg
Phablet: 3.15 W/kg

Buyers information

MSRP
$ 399 $ 1200 / € 1399
In The Box
18W USB-C power adapter, 1M USB-C to USB-C cable (USB 2.0), Quick Start Guide, Quick Switch Adapter, SIM tool C to C Data Cable, Ejection Pin

Availability

Officially announced
May 07, 2019 Jan 14, 2021

Alternative variants

4G (FDD) Bands 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 17, 20, 25, 26, 28, 29(700 d), 30(2300 WCS), 66(AWS-3), 71(600)
with 256GB storage
Memory 256GB
Colors Phantom black
MSRP $ 1250
with 512GB storage
Memory 16GB/512GB
Colors Phantom black
MSRP $ 1380
for Europe
System chip Samsung Exynos 2100 (5 nm)
Processor Octa-core
1x 2.91GHz Cortex-X1 + 3x 2.81GHz Cortex-A78 + 4x 2.2GHz Cortex-A55
GPU Mali G78 MP14
Weight 8.01 oz (227.0 g)
5G Bands SA, NSA, Sub-6
FCC approval Date approved: Dec 22, 2020
FCC ID value: A3LSMG998B
Measured SAR Head: 0.16 W/kg
Body: 0.72 W/kg
Simultaneous Transmission: 1.59 W/kg
Wireless Router: 1.34 W/kg
Phablet: 3.86 W/kg
FCC OKs Cingular\'s purchase of AT&T Wireless