Samsung Galaxy S21 Ultra 5G vs realme 8 - Detailed Phone Comparison

Detailed Comparison

Specification
realme 8
Realme

General

Launch Date January 29, 2021 May 28, 2024
Release Year 2021 2024

Physical

Volume 111.09 cm³ 105.85 cm³
Screen Size to Weight Ratio 3 "/g 3.55 "/g
Weight 227 g 191 g
Height 165.1 mm 162 mm
Width 75.6 mm 75.1 mm
Thickness 8.9 mm 8.7 mm
Foldable Design No No
Available Colors
  • Phantom Black
  • Phantom Silver
  • Phantom Titanium
  • Phantom Navy
  • Phantom Brown
  • Navy
  • Fluid Silver
  • Razor Green

Display

Screen Size 6.8 " 6.78 "
Resolution 1440 x 3200 1264 x 2780
Aspect Ratio 20:9 20:9
Screen-to-Body Ratio 89.4 % 91.8 %
Pixel Density 515 PPI 450 PPI
Refresh Rate 120 Hz 120 Hz
Typical Brightness N/A 1000 nits
HBM Brightness N/A 1600 nits
Peak Brightness 1500 nits 6000 nits

Hardware

Battery Capacity per Screen Area 108.13 mAh/in² 119.65 mAh/in²
Battery Density 45.01 mAh/cm³ 51.96 mAh/cm³
Battery Capacity 5000 mAh 5500 mAh
NFC Support Yes Yes
Chipset Exynos 2100 (5 nm) - International Qualcomm SM7675 Snapdragon 7+ Gen 3 (4 nm)
CPU Octa-core (1x2.9 GHz Cortex-X1 & 3x2.80 GHz Cortex-A78 & 4x2.2 GHz Cortex-A55) - International Octa-core (1x2.8 GHz Cortex-X4 & 4x2.6 GHz Cortex-A720 & 3x1.9 GHz Cortex-A520)
GPU Mali-G78 MP14 - International Adreno 732

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 USB Type-C 2.0

Software

Operating System Android Android
Initial OS Version 11 14
Maximum OS Version 15

Comparison Summary

Smartphone Comparison: Samsung Galaxy S21 Ultra 5G vs. realme 8

1. Specifications Comparison

FeatureSamsung Galaxy S21 Ultra 5Grealme 8Practical Impact
Design
Launch Date2021-01-292024-05-28realme 8 is newer by 3 months, 29 days
Dimensions165.1 x 75.6 x 8.9 mm162 x 75.1 x 8.7 mmS21 Ultra is slightly larger and thicker, impacting pocketability and one-handed use.
Weight227g191gS21 Ultra is significantly heavier, potentially less comfortable for long periods.
Display
Size6.8"6.78"Minimal difference in screen size.
Resolution1440x32001264x2780S21 Ultra's higher resolution results in noticeably sharper text and images.
PPI515450S21 Ultra has a sharper display with higher pixel density.
TechnologyAMOLEDAMOLEDBoth have vibrant colors, excellent contrast, and deep blacks.
Refresh Rate120Hz120HzBoth offer smooth scrolling and animations.
Brightness1500 nits0 nitsS21 Ultra has much better outdoor visibility in bright sunlight. Realme 8 brightness not listed.
Performance
ChipsetExynos 2100 (5 nm)Qualcomm SM7675 Snapdragon 7+ Gen 3 (4 nm)Realme 8 has a newer, more power-efficient chipset, though actual performance needs benchmark data.
Antutu Score749,000N/AS21 Ultra has a high score, but realme 8 score is not listed making direct performance comparison difficult.
GPUMali-G78 MP14Adreno 732Different GPUs; real world performance difference unknown without benchmarks.
Camera
Standard Camera108MP, f/1.8, 1/1.33"N/AS21 Ultra has a high resolution main camera. Realme 8's main camera is not specified.
Telephoto + Portrait10.8MP, f/2.4, 1/2.65"N/AS21 Ultra has a dedicated telephoto lens for zoomed shots and portrait mode.
Selfie Camera44MP, f/2.2, 1/2.65"N/AS21 Ultra has a high resolution selfie camera.
Telephoto Lens10.8MP, f/4.9, 1/2.65"N/AS21 Ultra has an additional telephoto lens.
Wide Angle + Macro12.2MP, f/2.2, 1/2.55"N/AS21 Ultra has an ultra-wide angle lens with macro capabilities.
VideoUp to 8K@24fps, with HDR, EISUp to 4K@60fps, with OIS, EISS21 Ultra offers higher resolution video with a wider variety of frame rates and HDR and better stabilization.
DXOMark Mobile115 (Photo: 121, Video: 100)N/AS21 Ultra has a high DxOMark score, indicating good image quality.
DXOMark Selfie135 (Photo: 133, Video: 140)N/AS21 Ultra has a very good DXOMark score for its selfie camera.
Features8K video, optical zoom, quadruple camera, OIS, etc.N/AS21 Ultra offers a wider array of camera features.
Battery
Capacity5000mAh0 mAhS21 Ultra has a larger battery for potentially longer battery life. Real me 8's battery capacity is not listed.
Charging25W Fast Charging, Wireless 15W, Reverse Wireless 9WStandard ChargingS21 Ultra has faster charging and wireless charging.
FeaturesReverse charging, wireless chargingStandard FeaturesS21 Ultra has a larger battery and more charging options.
Software
OSAndroid 11 (upgradable to 15)Android 14Realme 8 has a newer version out of the box.
Connectivity
Wi-FiWi-Fi 6N/AS21 Ultra supports faster Wi-Fi standards.
BluetoothBluetooth 5.2 LEN/AS21 Ultra has a newer Bluetooth version with more audio profiles.
GPSDual band GPSN/AS21 Ultra offers more precise location tracking.
SIMDual Nano SIM, Dual StandbyN/AS21 Ultra supports two SIM cards at the same time.
Storage
Internal128/256/512GBN/AS21 Ultra offers higher internal storage options.
RAM12/16GBN/AS21 Ultra has greater RAM options for more demanding applications.
ExpandableNoNoNeither phone offers expandable storage.
Audio
QualityDolby Atmos, Hi-Res Audio, Stereo SpeakersBasic FeaturesS21 Ultra offers a premium audio experience with advanced features.
Security
FeaturesBasic fingerprint sensorBasic fingerprint sensorBoth have fingerprint sensor for security.
Build
ProtectionCorning Gorilla Glass VictusScreen protection is unknownS21 Ultra provides better screen protection.
Sensors
FeaturesFingerprint, Proximity, Accelerometer, Compass, Gyroscope, Barometer, Hall, GeomagneticBasic SensorsS21 Ultra has a full sensor suite.

2. Key Differences Analysis

Samsung Galaxy S21 Ultra 5G Advantages:

  • Superior Display: Significantly higher resolution and brightness provide a much sharper and more visible display, especially outdoors.
  • Advanced Camera System: Offers a versatile quad-camera setup with higher resolution sensors, optical zoom, and 8K video recording, resulting in higher quality photos and videos, and more flexibility.
  • Faster Charging and Wireless Capabilities: Supports faster wired charging, wireless charging, and reverse wireless charging for convenience.
  • Premium Audio: Offers a high-quality audio experience with Dolby Atmos, Hi-Res audio, and stereo speakers.
  • Robust Connectivity: Supports the latest Wi-Fi and Bluetooth standards and dual-band GPS.
  • More RAM and Storage options: Offers higher RAM and internal storage configurations, leading to improved multitasking and storage capacity.
  • Comprehensive Sensor Suite: Includes a broader range of sensors that provide a richer user experience with added functionality.
  • Better Build Quality: Offers superior screen protection with Corning Gorilla Glass Victus.

Realme 8 Advantages:

  • Newer Operating System: Runs a newer version of Android out of the box (Android 14), which may offer more features and security updates compared to the older Android 11 of the S21 Ultra.
  • Lighter Weight: More comfortable for extended use.
  • Newer Chipset: The Snapdragon 7+ Gen 3 chipset is more recent, likely offering better efficiency and newer features, although the exact performance vs the Exynos 2100 is unknown without benchmark data.

Trade-offs:

  • Samsung Galaxy S21 Ultra 5G: The S21 Ultra is heavier and bulkier, with an older chipset, despite its performance advantages; also lacks a headphone jack.
  • Realme 8: Lack of detailed specifications and test results limit comparison, but, from the information available, the Realme 8 is significantly less capable in the camera, display, and battery categories.

3. User Profiles & Recommendations

Samsung Galaxy S21 Ultra 5G:

  • Ideal User:

    • Photography enthusiasts who need top-tier camera capabilities.
    • Power users who demand high performance, smooth multitasking, and top of the line specifications.
    • Users who consume high quality media and want a vibrant, sharp display, and a great audio experience
    • Users who require advanced features for gaming and productivity.
    • Users who need robust build quality, protection, and a more premium experience.
  • Use Cases:

    • Professional photography and videography.
    • High-end mobile gaming.
    • Demanding tasks like video editing or 3D rendering.
    • Outdoor use in bright sunlight.
    • Long usage without frequent charging.

Realme 8:

  • Ideal User:

    • Users who prioritize a newer OS version out of the box.
    • Budget-conscious users who prioritize light weight and are not concerned with the premium features of the S21 Ultra.
    • Users who are not primarily concerned with advanced features or a top-end camera.
  • Use Cases:

    • Everyday tasks like social media and browsing.
    • General media consumption.
    • Casual mobile gaming.

Price-to-Value Ratio:

  • Samsung Galaxy S21 Ultra 5G: Offers a more premium experience, so commands a higher price. Its value proposition lies in its advanced camera, display, and performance for the demanding user.
  • Realme 8: As it is an unlisted and undefined product with lacking information. it is likely positioned as a budget-friendly option, focusing on basic smartphone functionality at a lower price point.

4. Decision Framework

Key Questions to Consider:

  1. Camera Needs: How important is a high-quality camera with features like optical zoom, 8K video, and advanced stabilization?
  2. Display Quality: How much do you value a sharp, bright display for media consumption and outdoor visibility?
  3. Performance and Battery: How crucial is high performance for gaming or productivity, and how important is long battery life and fast charging?

Scenario-Based Recommendations:

  • Scenario 1: Photography Enthusiast: If you take a lot of photos and videos and want the best possible quality, the Samsung Galaxy S21 Ultra 5G is the clear choice due to its advanced camera system.
  • Scenario 2: Casual User on a Budget: If you only use your phone for basic tasks and want a more budget friendly device, the realme 8 might be the appropriate choice, however, there is no listed information or price which makes it hard to consider.
  • Scenario 3: Performance User: If you use your phone for heavy gaming, multitasking, and need top-tier performance, the Samsung Galaxy S21 Ultra 5G is the better option with more ram, even though the chipset is slightly older, it's performance is still more advanced.

My Choice

Based on the provided information, I would choose the Samsung Galaxy S21 Ultra 5G. While it is an older device, its superior camera system, brighter and sharper display, advanced audio features, wireless charging capabilities, larger battery capacity, and overall more advanced sensor suite make it the better choice for a premium experience, especially for photography, media, and gaming. The S21 Ultra provides a more reliable experience even though the realme 8 is newer, due to lacking information about the realme 8. The S21 Ultra has been tried and tested and still holds up. While the newer chipset of the realme 8 is alluring, the missing specifications and lack of benchmark data make it a riskier choice and for someone that uses their phone for demanding tasks, the S21 Ultra is a better choice.

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
  • Digital media communication
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Bridging technical complexity with engaging, accessible narratives.