Device comparison

Two devices. One clear decision.

Choose the exact models, then compare every available specification in one aligned view.

Missing information stays missing. Only stored specifications are shown.

Device A

Galaxy S21 Ultra

Samsung · Phones

Brand Model Open full profile →

Device B

Xiaomi · Phones

Brand Model Open full profile →

Complete comparison

Every available group and stored value, aligned by field.

Differences only

LAUNCH DATE3 fields

NETWORK6 fields

Specification	Galaxy S21 Ultra	Redmi Note 17 Pro Max
2G Bands	GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2	GSM: B2/B3/B5/B8
3G Bands	HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100; CDMA2000 1xEV-DO	WCDMA: B1/B2/B4/B5/B8
4G LTE	1, 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-G998U1; 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 38, 39, 40, 41, 66 - SM-G998B	LTE FDD: B1/B2/B3/B4/B5/B7/B8/B12/B13/B17/B18/B19/B20/ B26/B28/B32/B66; LTE TDD: B38/B40/B41/B42/B48
5G	2, 5, 25, 41, 66, 71, 260, 261 SA/NSA/Sub6/mmWave - SM-G998U1; 1, 3, 5, 7, 8, 20, 28, 38, 40, 41, 66, 77, 78 SA/NSA/Sub6 - SM-G998B	n1/2/3/5/7/8/12/20/26/28/38/40/41/48/66/77/78
Speed	LTE, 5G	LTE, 5G
Technology	5G/4G/LTE/GSM	5G / 4G / 3G / 2G

BODY5 fields

Specification	Galaxy S21 Ultra	Redmi Note 17 Pro Max
Build	Glass front (Gorilla Glass Victus), glass back (Gorilla Glass Victus), aluminum frame	Glass front, glass back, plastic frame
Dimensions	165.1 x 75.6 x 8.9 mm (6.5 x 2.98 x 0.35 in)	163.44 x 78.27 x 8.65 mm
IP Rating	IP68 dust/water resistant (up to 1.5m for 30 min)	IP66, IP68, IP69, IP69K
SIM	Nano-SIM + eSIM Nano-SIM + Nano-SIM + eSIM (max 2 at a time)	Dual SIM (nano SIM + nano SIM or nano SIM + eSIM or eSIM + eSIM)
Weight	227 g (Sub6), 229 g (mmWave) (8.01 oz)	229.5g

DISPLAY9 fields

Specification	Galaxy S21 Ultra	Redmi Note 17 Pro Max
Brightness	1500 nits (peak)	Brightness: 3500 nits (UHBM), 2000 nits (HBM), 1060 nits (typical)
Color	—	DCI- P3 wide color gamut
Features	—	Sunlight display; 3840Hz PWM dimming; HDR10+
Protection	Corning Gorilla Glass Victus	Corning Gorilla Glass Victus 2
Refresh Rate	120Hz	Up to 120Hz
Resolution	1440 x 3200 pixels, 20:9 ratio (~515 ppi density)	1280 x 2772 pixels, 19.5:9 ratio (~447 ppi density)
Screen-to-body	~89.8%	~89.5%
Size	6.8 inches, 112.1 cm2 (~89.8% screen-to-body ratio)	6.83"
Type	Dynamic AMOLED 2X, 120Hz, HDR10+, 1500 nits (peak)	AMOLED

PLATFORM4 fields

Specification	Galaxy S21 Ultra	Redmi Note 17 Pro Max
CPU	Octa-core (1x2.9 GHz Cortex-X1 & 3x2.80 GHz Cortex-A78 & 4x2.2 GHz Cortex-A55) - International Octa-core (1x2.84 GHz Cortex-X1 & 3x2.42 GHz Cortex-A78 & 4x1.80 GHz Cortex-A55) - USA/China	Octa-core, up to 2.6 GHz
Chipset	Exynos 2100 (5 nm) - International / Qualcomm SM8350 Snapdragon 888 5G (5 nm) - USA/China	Snapdragon 6 Gen 5
GPU	Mali-G78 MP14 - International Adreno 660 - USA/China	Adreno
OS	Android 11, up to 4 major Android upgrades, One UI 6.1	Xiaomi HyperOS 3

MEMORY5 fields

Specification	Galaxy S21 Ultra	Redmi Note 17 Pro Max
Card slot	No	No
Internal	128GB, 256GB, 512GB	128GB / 256GB / 512GB
RAM	8GB RAM, 12GB RAM,16GB RAM,	8 GB / 12 GB
Storage Type	—	UFS 4.1 (256GB / 512GB); UFS 2.2 (128GB); UFS 4.1: up to 2,100 MB/s; UFS 2.2: up to 1,000 MB/s
Storage/RAM variants	128GB, 256GB, 512GB; 8GB RAM, 12GB RAM,16GB RAM,	128GB / 256GB / 512GB; 8 GB / 12 GB RAM

MAIN CAMERA3 fields

Specification	Galaxy S21 Ultra	Redmi Note 17 Pro Max
Features	Laser AF, LED flash, auto-HDR, panorama	LED Flash, Panorama, HDR
MAIN CAMERA	108 MP, f/1.8, 24mm (wide), 1/1.33", 0.8µm, PDAF, OIS 10 MP, f/2.4, 72mm (telephoto), 1/3.24", 1.22µm, dual pixel PDAF, OIS, 3x optical zoom 10 MP, f/4.9, 240mm (periscope telephoto), 1/3.24", 1.22µm, dual pixel PDAF, OIS, 10x optical zoom 12 MP, f/2	50MP main camera, f/1.5; 8MP ultra-wide camera, f/2.2
Video	8K@24fps, 4K@30/60fps, 1080p@30/60/120/240fps, HDR10+, stereo sound rec., gyro-EIS	4K at 30 fps; 1080p at 30/60 fps; 720p at 30 fps

SELFIE CAMERA3 fields

SOUND3 fields

COMMUNICATION6 fields

Specification	Galaxy S21 Ultra	Redmi Note 17 Pro Max
Bluetooth	5.2, A2DP, LE	6.0
NFC	Yes	Yes
Positioning	GPS, GLONASS, BDS, GALILEO	GPS, GLONASS, Galileo, BDS, QZSS
Radio	FM radio (Snapdragon model only; market/operator dependent)	No
USB	USB Type-C 3.2, OTG	USB-C
WLAN	Wi-Fi 802.11 a/b/g/n/ac/6e, dual-band, Wi-Fi Direct	Wi-Fi Protocol: Wi-Fi 6, Wi-Fi 5, Wi-Fi 4, 802.11а/b/g

FEATURES2 fields

Specification	Galaxy S21 Ultra	Redmi Note 17 Pro Max
Ai	—	AI Erase Pro, AI Glare Removal, AI Image Expansion, AI Sky, AI Bokeh, AI Cutouts, AI Image Enhancement, AI Beautify, AI Film; Circle to Search with Google, Google Gemini
Sensors	Fingerprint (under display, ultrasonic), accelerometer, gyro, proximity, compass, barometer	Proximity sensor; Ambient light sensor; Accelerometer; Electronic compass; IR blaster; Gyroscope

BATTERY3 fields

Specification	Galaxy S21 Ultra	Redmi Note 17 Pro Max
Capacity	5000 mAh	10000mAh(typ)
Charging Type	25W wired, PD3.0 15W wireless (Qi) 4.5W reverse wireless	100W HyperCharge; Supports 27W wired reverse charging
Type	Li-Ion 5000 mAh	Silicon-carbon

ADDITIONAL INFORMATION5 fields

Specification	Galaxy S21 Ultra	Redmi Note 17 Pro Max
Colors	Phantom Black, Phantom Silver, Phantom Titanium, Phantom Navy, Phantom Brown, Navy	Black; Green; Purple
Compatibility	—	Global specification set
Launch Price (USD)	$399.98 (reference only — see Price in Nigeria above for the actual retail price)	—
Models	SM-G998B, SM-G998B/DS, SM-G998U, SM-G998U1, SM-G998W, SM-G998N, SM-G9980	Redmi Note 17 Pro Max 5G, 2609FRA74G
Price in Nigeria	₦770,000 (Saved seller price · not yet reverified)	₦699,800 (Saved seller price · not yet reverified)

SECURITY1 field

Specification	Galaxy S21 Ultra	Redmi Note 17 Pro Max
Security	Biometric security: Fingerprint (under display, ultrasonic).	In-screen fingerprint sensor; AI face unlock