Samsung Galaxy S21 Ultra 5G vs Xiaomi Redmi 12C - Detailed Phone Comparison

Detailed Comparison

Specification

General

Launch Date January 29, 2021 January 1, 2023
Release Year 2021 2023

Physical

Volume 111.09 cm³ 113.49 cm³
Screen Size to Weight Ratio 3 "/g 3.49 "/g
Weight 227 g 192 g
Height 165.1 mm 168.8 mm
Width 75.6 mm 76.4 mm
Thickness 8.9 mm 8.8 mm
Foldable Design No No
Available Colors
  • Phantom Black
  • Phantom Silver
  • Phantom Titanium
  • Phantom Navy
  • Phantom Brown
  • Navy
  • Mint Green
  • Graphite Gray
  • Ocean Blue
  • Lavender Purple

Display

Screen Size 6.8 " 6.71 "
Resolution 1440 x 3200 720 x 1650
Aspect Ratio 20:9 21:9
Screen-to-Body Ratio 89.4 % 82.6 %
Pixel Density 515 PPI 268 PPI
Refresh Rate 120 Hz N/A
Typical Brightness N/A 500 nits
HBM Brightness N/A N/A
Peak Brightness 1500 nits N/A

Hardware

Battery Capacity per Screen Area 108.13 mAh/in² 111.05 mAh/in²
Battery Density 45.01 mAh/cm³ 44.06 mAh/cm³
Battery Capacity 5000 mAh 5000 mAh
NFC Support Yes Yes
Chipset Exynos 2100 (5 nm) - International Mediatek MT6769Z Helio G85 (12 nm)
CPU Octa-core (1x2.9 GHz Cortex-X1 & 3x2.80 GHz Cortex-A78 & 4x2.2 GHz Cortex-A55) - International Octa-core (2x2.0 GHz Cortex-A75 & 6x1.8 GHz Cortex-A55)
GPU Mali-G78 MP14 - International Mali-G52 MC2

Connectivity

USB Version 3.2 2.0
OTG Support 1
DisplayPort
DisplayPort Version N/A N/A
USB Features USB Type-C 3.2, OTG microUSB 2.0

Software

Operating System Android Android
Initial OS Version 11 12
Maximum OS Version 15

Comparison Summary

Smartphone Comparison: Samsung Galaxy S21 Ultra 5G vs. Xiaomi Redmi 12C

1. Specifications Comparison

FeatureSamsung Galaxy S21 Ultra 5GXiaomi Redmi 12CPractical Impact
Design
Dimensions165.1 × 75.6 × 8.9 mm168.8 × 76.4 × 8.8 mmRedmi 12C is slightly taller, negligibly wider and thinner.
Weight227g192gS21 Ultra is noticeably heavier, may be less comfortable for extended use.
Display
Size6.8"6.71"Very similar screen sizes.
Resolution1440x3200720x1650S21 Ultra's display is significantly sharper and clearer, especially for text and images.
PPI515268S21 Ultra has much higher pixel density, resulting in a crisper image.
TechnologyAMOLEDIPS LCDS21 Ultra has deeper blacks, better contrast, and more vibrant colors. Better visibility in bright conditions.
Refresh Rate120Hz60HzS21 Ultra offers much smoother scrolling, animations and gaming.
Brightness1500 nits0 nitsS21 Ultra is much more visible in direct sunlight, Redmi 12C's brightness is not specified.
Performance
ChipsetExynos 2100 (5 nm)Mediatek Helio G85 (12 nm)S21 Ultra's chipset is much more powerful, offering significantly better performance and efficiency.
AnTuTu Score749,000225,154S21 Ultra performs much better in all tasks, from app loading to gaming, and will remain relevant longer.
GPUMali-G78 MP14Mali-G52 MC2S21 Ultra has a more powerful GPU for better graphics in gaming and demanding apps.
Camera
Standard Camera108MP (f/1.8, 1/1.33")50MP (f/1.8)S21 Ultra captures much more detailed images.
Telephoto + Portrait Camera10.8MP (f/2.4, 1/2.65")NoneS21 Ultra can take zoomed images with less loss in quality and better portraits.
Selfie Camera44MP (f/2.2, 1/2.65")5MPS21 Ultra captures significantly sharper and detailed selfies.
Telephoto Lens10.8MP (f/4.9, 1/2.65")NoneS21 Ultra offers an additional dedicated telephoto lens.
Macro LensNone2MP (f/2.4)Redmi 12C has a dedicated macro camera for very close-up shots.
Wide Angle + Macro12.2MP (f/2.2, 1/2.55")NoneS21 Ultra has a versatile wide-angle camera that can also capture macro photos.
Video RecordingUp to 8K@24fpsUp to 1080p@30fpsS21 Ultra can record much higher quality videos with more advanced features, such as HDR and stabilization.
DxOMark Mobile11545S21 Ultra's camera is significantly superior in both photo and video quality.
DxOMark Selfie135N/AS21 Ultra's selfie camera is high-performing.
Battery
Capacity5000mAh5000mAhSimilar battery life expected in general use
Charging25W Fast Charging10W Fast ChargingS21 Ultra charges much faster, reducing waiting times.
FeaturesWireless, Reverse ChargingNoneS21 Ultra offers more flexible charging options.
Software
OSAndroid 11 (Upgradable to 15)Android 12Redmi 12C has a slightly newer initial OS, but less updates guaranteed.
Connectivity
WiFiWiFi 6 (802.11ax)WiFi 5 (802.11ac)S21 Ultra supports faster and more efficient WiFi.
Bluetooth5.25.1S21 Ultra has a slightly newer Bluetooth version, leading to better connectivity, and more features.
Storage
Internal128/256/512 GB32/64/128 GBS21 Ultra offers much higher storage capacity options.
RAM12/16 GB3/4/6 GBS21 Ultra offers much more RAM for smoother multitasking and gaming.
ExpandableNoNoNeither phone supports expandable storage.
Audio
QualityDolby Atmos, Hi-Res AudioBasic Audio FeaturesS21 Ultra delivers much superior audio experience.
Security
FeaturesBasic fingerprint sensorRear-mounted fingerprint sensorBoth phones offer fingerprint security.
Build Quality
Screen ProtectionCorning Gorilla Glass VictusUnknownS21 Ultra has better screen protection.

2. Key Differences Analysis

Samsung Galaxy S21 Ultra 5G Advantages:

  • Superior Display: Significantly higher resolution, pixel density, AMOLED technology, higher refresh rate, and brightness results in a much better viewing experience for all tasks.
  • Much Higher Performance: The Exynos 2100 chipset offers significantly faster processing and graphics capabilities, leading to smoother multitasking and gaming.
  • Professional-Grade Camera System: Features a versatile camera system with higher resolution sensors, multiple telephoto lenses, and 8K video recording capability. Better photo and video quality.
  • Faster Charging & Wireless Charging: 25W fast charging, wireless and reverse wireless charging enhance user convenience and flexibility.
  • Premium Audio: Features like Dolby Atmos and Hi-Res Audio provide a superior audio experience.
  • Better Connectivity: Supports the latest WiFi 6 and Bluetooth 5.2 standards.
  • More RAM & Storage: Higher capacity options for both RAM and storage.
  • Superior Build Quality: Better screen protection with Gorilla Glass Victus.

Xiaomi Redmi 12C Advantages:

  • Lighter Weight: The Redmi 12C is significantly lighter, which may be more comfortable for extended use.
  • Lower Price: Expected to be considerably more affordable.
  • Macro Camera: Offers a dedicated macro camera for close-up shots.
  • Newer Initial OS: Comes with a slightly newer Android version out of the box (however, updates are less guaranteed).

Trade-offs:

  • S21 Ultra: Significantly more expensive, may be overkill for basic users.
  • Redmi 12C: Substantially lower performance, inferior display, and a much less advanced camera system.

3. User Profiles & Recommendations

Samsung Galaxy S21 Ultra 5G Ideal Users:

  • Tech Enthusiasts: Who demand the best possible performance, display, and camera experience.
  • Power Users: Those who engage in heavy multitasking, gaming, or resource-intensive applications.
  • Photography and Videography Enthusiasts: Those who want high-quality camera features for capturing photos and video.
  • Users Who value premium features: Users who value a superior viewing experience, fast charging, wireless charging, and premium audio.

Xiaomi Redmi 12C Ideal Users:

  • Budget-Conscious Users: Who prioritize affordability over high-end features.
  • Basic Smartphone Users: Those who primarily use their phone for calls, texts, basic browsing, and social media.
  • Users who want a lightweight device: Users who want a phone that is comfortable to use for long periods of time and is easy to carry.

Specific Use Cases:

  • S21 Ultra: Ideal for professional photography, videography, graphic design, gaming, and demanding multitasking.
  • Redmi 12C: Suited for simple tasks, light social media use, and casual gaming.

Price-to-Value Ratio:

  • S21 Ultra: Offers very high performance and top of the line features for a premium price. It will be the better value for anyone who is looking for the best specifications.
  • Redmi 12C: Provides basic functionality at an affordable price, making it a better value for the most budget conscious users.

4. Decision Framework

Key Questions to Consider:

  1. What is your budget? The price difference between these phones is substantial.
  2. What are your primary phone usage needs? Do you need a powerful device for demanding tasks, or a basic one for simple communication?
  3. How important is camera quality to you? Do you need professional grade features, or are basic photos sufficient?

Scenario-Based Recommendations:

  • Scenario 1: Budget is a primary concern & basic usage is all that is needed: Choose the Xiaomi Redmi 12C.
  • Scenario 2: Desire a premium phone experience with top performance and camera Choose the Samsung Galaxy S21 Ultra 5G.
  • Scenario 3: Want the best photo & video taking experience on a smartphone: Choose the Samsung Galaxy S21 Ultra 5G.

My Choice

If I were choosing, I would select the Samsung Galaxy S21 Ultra 5G. While acknowledging the substantial price difference, the S21 Ultra's superior display, significantly better performance, professional-grade camera system, faster charging, wireless charging capabilities, and premium audio features are compelling. I would prefer the better build quality, more advanced connectivity, and the large amount of RAM and storage capacity. These features make the phone much better for my use case, as I tend to use my phone for many demanding tasks, which would greatly benefit from the performance and features the S21 Ultra provides. The difference in user experience between the two would be massive.

Emily Harper
Emily Harper

Technology Insights Specialist

Dedicated technology writer specializing in mobile device analysis and technology communication. Expert at translating complex smartphone features into clear, actionable insights for diverse audiences.

Key Strengths:

  • Mobile technology analysis
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Bridging technical complexity with engaging, accessible narratives.