Screen size
Galaxy S21 5G6.2"
Galaxy Tab S12 UltraWinner: 14.6"+58%
Quick verdict
Galaxy Tab S12 Ultra leads the measured specs 14-3.
Measured wins
Galaxy S21 5G
3
spec wins
Ties
6
equal specs
Galaxy Tab S12 Ultra
14
spec wins
Overall winner
Screen size
Technology
Galaxy S21 5G
GSM / CDMA / HSPA / EVDO / LTE / 5G
Galaxy Tab S12 Ultra
GSM / HSPA / LTE / 5G
2G bands
Galaxy S21 5G
GSM 850 / 900 / 1800 / 1900 , CDMA 800 / 1900 & TD-SCDMA
Galaxy Tab S12 Ultra
GSM 850 / 900 / 1800 / 1900
3G bands
Galaxy S21 5G
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 , CDMA2000 1xEV-DO
Galaxy Tab S12 Ultra
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
4G bands
Galaxy S21 5G
Resolution
Refresh rate
equal specsPeak brightness
Pixel density
CPU speed
RAM
Storage
Main camera
Front camera
Battery
Wired charging
Weight
Thickness
IP rating
equal specsWi‑Fi
Bluetooth
USB
equal specs5G support
equal specsNFC
3.5mm jack
equal specsSD card
Stereo speakers
equal specs1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 30, 38, 39, 40, 41, 46, 48, 66, 71 - SM-G991U1, 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 38, 39, 40, 41, 66 - SM-G991B
Galaxy Tab S12 Ultra
LTE
5G bands
Galaxy S21 5G
2, 5, 25, 41, 66, 71, 260, 261 SA/NSA/Sub6/mmWave - SM-G991U1, 1, 3, 5, 7, 8, 20, 28, 38, 40, 41, 66, 77, 78 SA/NSA/Sub6 - SM-G991B
Galaxy Tab S12 Ultra
SA/NSA/Sub6
Speed
Galaxy S21 5G
HSPA 42.2/5.76 Mbps, LTE (7CA) Cat20 2000/200 Mbps, 5G (5+ Gbps DL)
Galaxy Tab S12 Ultra
HSPA, LTE, 5G - cellular model only
Announced
Galaxy S21 5G
2021, January 14
Galaxy Tab S12 Ultra
2026, September 30
Status
Galaxy S21 5G
Available. Released 2021, January 29
Galaxy Tab S12 Ultra
Released Oct 7, 2026
Dimensions
Galaxy S21 5G
151.7 x 71.2 x 7.9 mm (5.97 x 2.80 x 0.31 in)
Galaxy Tab S12 Ultra
326.3 x 208.5 x 5.1 mm (12.85 x 8.21 x 0.20 in)
Weight
Galaxy S21 5G
169 g (Sub6), 171 g (mmWave) (5.96 oz)
Galaxy Tab S12 Ultra
692 g or 695 g (1.53 lb)
Build
Galaxy S21 5G
Glass front (Gorilla Glass Victus), plastic back, aluminum frame
Galaxy Tab S12 Ultra
Glass front, aluminum frame, aluminum back
SIM
Galaxy S21 5G
· Nano-SIM + eSIM· Nano-SIM + Nano-SIM + eSIM (max 2 at a time)
Galaxy Tab S12 Ultra
Nano-SIM + eSIM (cellular model only)
Other
Galaxy S21 5G
IP68 dust tight and water resistant (immersible up to 1.5m for 30 min)
Galaxy Tab S12 Ultra
IP68 dust tight and water resistant (immersible up to 1.5m for 30 min) Stylus support Enhanced Armor Aluminum
Type
Galaxy S21 5G
Dynamic AMOLED 2X, 120Hz, HDR10+, 1300 nits (peak)
Galaxy Tab S12 Ultra
Dynamic AMOLED 2X, 120Hz, HDR10+, 1000 nits (HBM), 1600 nits (peak)
Size
Galaxy S21 5G
6.2 inches, 94.1 cm2 (~87.2% screen-to-body ratio)
Galaxy Tab S12 Ultra
14.6 inches, 617.8 cm2 (~90.8% screen-to-body ratio)
Resolution
Galaxy S21 5G
1080 x 2400 pixels, 20:9 ratio (~421 ppi density)
Galaxy Tab S12 Ultra
1848 x 2960 pixels, 16:10 ratio (~239 ppi density)
Protection
Galaxy S21 5G
Corning Gorilla Glass Victus
Galaxy Tab S12 Ultra
-
OS
Galaxy S21 5G
Android 11, up to 4 major Android upgrades, One UI 6.1
Galaxy Tab S12 Ultra
Android 17, up to 7 major OS updates, One UI 9
Chipset
Galaxy S21 5G
Exynos 2100 (5 nm) - InternationalQualcomm SM8350 Snapdragon 888 5G (5 nm) - USA/China
Galaxy Tab S12 Ultra
MediaTek Dimensity 9500 (3 nm)
CPU
Galaxy S21 5G
Octa-core (1x2.9 GHz Cortex-X1 & 3x2.80 GHz Cortex-A78 & 4x2.2 GHz Cortex-A55) - InternationalOcta-core (1x2.84 GHz Cortex-X1 & 3x2.42 GHz Cortex-A78 & 4x1.80 GHz Cortex-A55) - USA/China
Galaxy Tab S12 Ultra
Octa-core (1x4.21 GHz C1-Ultra & 3x3.5 GHz C1-Premium & 4x2.7 GHz C1-Pro)
GPU
Galaxy S21 5G
Mali-G78 MP14 - InternationalAdreno 660 - USA/China
Galaxy Tab S12 Ultra
Mali-G1 Ultra MC12
Card slot
Galaxy S21 5G
No
Galaxy Tab S12 Ultra
microSDXC (dedicated slot)
Internal
Galaxy S21 5G
128GB 6GB RAM, 128GB 8GB RAM, 256GB 8GB RAM
Galaxy Tab S12 Ultra
256GB 12GB RAM, 512GB 12GB RAM, 1TB 16GB RAM
Other
Galaxy S21 5G
UFS 3.1
Galaxy Tab S12 Ultra
UFS
Triple
Galaxy S21 5G
12 MP, f/1.8, 26mm (wide), 1/1.76", 1.8µm, dual pixel PDAF, OIS 64 MP, f/2.0, 29mm (telephoto), 1/1.72", 0.8µm, PDAF, OIS, 1.1x optical zoom, 3x hybrid zoom 12 MP, f/2.2, 13mm, 120˚ (ultrawide), 1/2.55" 1.4µm, Super Steady video
Galaxy Tab S12 Ultra
-
Features
Galaxy S21 5G
LED flash, auto-HDR, panorama
Galaxy Tab S12 Ultra
LED flash, HDR, panorama
Video
Galaxy S21 5G
8K@24fps, 4K@30/60fps, 1080p@30/60/120/240fps, HDR10+, stereo sound rec., gyro-EIS
Galaxy Tab S12 Ultra
4K@30fps, 1080p@30fps
Dual
Galaxy S21 5G
-
Galaxy Tab S12 Ultra
13 MP, f/2.0, 26mm (wide), 1/3.4", 1.0µm, AF 8 MP, f/2.2, (ultrawide)
Single
Galaxy S21 5G
10 MP, f/2.2, 26mm (wide), 1/3.24", 1.22µm, dual pixel PDAF
Galaxy Tab S12 Ultra
12 MP, f/2.4, 120˚ (ultrawide)
Features
Galaxy S21 5G
HDR
Galaxy Tab S12 Ultra
HDR
Video
Galaxy S21 5G
4K@30/60fps, 1080p@30fps
Galaxy Tab S12 Ultra
4K@30fps, 1080p@30fps
Loudspeaker
Galaxy S21 5G
Yes, with stereo speakers
Galaxy Tab S12 Ultra
Yes, with stereo speakers (4 speakers)
3.5mm jack
Galaxy S21 5G
No
Galaxy Tab S12 Ultra
No
Other
Galaxy S21 5G
High-bitrate audio support
Galaxy Tab S12 Ultra
-
WLAN
Galaxy S21 5G
Wi-Fi 802.11 a/b/g/n/ac/6, dual-band, Wi-Fi Direct
Galaxy Tab S12 Ultra
Wi-Fi 802.11 a/b/g/n/ac/6e/7, tri-band, Wi-Fi Direct
Bluetooth
Galaxy S21 5G
5.0, A2DP, LE
Galaxy Tab S12 Ultra
6.0, A2DP, LE
Positioning
Galaxy S21 5G
GPS, GLONASS, BDS, GALILEO
Galaxy Tab S12 Ultra
GPS, GLONASS, BDS, GALILEO
NFC
Galaxy S21 5G
Yes
Galaxy Tab S12 Ultra
No
Radio
Galaxy S21 5G
FM radio (Snapdragon model only; market/operator dependent)
Galaxy Tab S12 Ultra
No
USB
Galaxy S21 5G
USB Type-C 3.2, OTG
Galaxy Tab S12 Ultra
USB Type-C 3.2, magnetic connector
Sensors
Galaxy S21 5G
Fingerprint (under display, ultrasonic), accelerometer, gyro, proximity, compass, barometer
Galaxy Tab S12 Ultra
Fingerprint (under display, optical), accelerometer, gyro, proximity, compass
Other
Galaxy S21 5G
Samsung DeX, Samsung Wireless DeX (desktop experience support)
Galaxy Tab S12 Ultra
Wireless Samsung DeX (desktop experience support)
Type
Galaxy S21 5G
Li-Ion 4000 mAh
Galaxy Tab S12 Ultra
Li-Po 11600 mAh
Charging
Galaxy S21 5G
25W wired, PD3.0 15W wireless (Qi) 4.5W reverse wireless
Galaxy Tab S12 Ultra
45W wired, 100% in 95 min
Colors
Galaxy S21 5G
Phantom Gray, Phantom White, Phantom Violet, Phantom Pink
Galaxy Tab S12 Ultra
Gray, Silver
Models
Galaxy S21 5G
SM-G991B, SM-G991B/DS, SM-G991U, SM-G991U1, SM-G991W, SM-G991N, SM-G9910, SM-G991Q, SCG09
Galaxy Tab S12 Ultra
SM-X940, SM-X946
SAR
Galaxy S21 5G
0.74 W/kg (head) 1.08 W/kg (body)
Galaxy Tab S12 Ultra
-
SAR EU
Galaxy S21 5G
0.46 W/kg (head) 1.51 W/kg (body)
Galaxy Tab S12 Ultra
0.47 W/kg (body)
Price
Galaxy S21 5G
$ 159.99 / C$ 271.75 / £ 146.90 / € 189.99
Galaxy Tab S12 Ultra
About 1570 EUR