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

Detailed Comparison

Specification
Realme 8
Realme 8
Realme

General

Launch Date January 29, 2021 March 25, 2021
Release Year 2021 2021

Physical

Volume 111.09 cm³ 94.95 cm³
Screen Size to Weight Ratio 3 "/g 3.62 "/g
Weight 227 g 177 g
Height 165.1 mm 160.6 mm
Width 75.6 mm 73.9 mm
Thickness 8.9 mm 8 mm
Foldable Design No No
Available Colors
  • Phantom Black
  • Phantom Silver
  • Phantom Titanium
  • Phantom Navy
  • Phantom Brown
  • Navy
  • Cyber Silver
  • Cyber Black

Display

Screen Size 6.8 " 6.4 "
Resolution 1440 x 3200 1080 x 2400
Aspect Ratio 20:9 20:9
Screen-to-Body Ratio 89.4 % 83.3 %
Pixel Density 515 PPI 411 PPI
Refresh Rate 120 Hz N/A
Typical Brightness N/A N/A
HBM Brightness N/A N/A
Peak Brightness 1500 nits 1000 nits

Hardware

Battery Capacity per Screen Area 108.13 mAh/in² 122.07 mAh/in²
Battery Density 45.01 mAh/cm³ 52.66 mAh/cm³
Battery Capacity 5000 mAh 5000 mAh
NFC Support Yes Yes
Chipset Exynos 2100 (5 nm) - International Mediatek MT6785V/CD Helio G95 (12 nm)
CPU Octa-core (1x2.9 GHz Cortex-X1 & 3x2.80 GHz Cortex-A78 & 4x2.2 GHz Cortex-A55) - International Octa-core (2x2.05 GHz Cortex-A76 & 6x2.0 GHz Cortex-A55)
GPU Mali-G78 MP14 - International Mali-G76 MC4

Connectivity

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

Software

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

Comparison Summary

1. Specifications Comparison

Here's a detailed comparison of the Samsung Galaxy S21 Ultra 5G and the Realme 8, focusing on practical implications:

Design

FeatureSamsung Galaxy S21 Ultra 5GRealme 8Practical Impact
Dimensions165.1 × 75.6 × 8.9 mm160.6 × 73.9 × 8 mmS21 Ultra is larger, potentially less comfortable for smaller hands or pockets. Realme 8 is more compact and easier to handle.
Weight227g177gS21 Ultra is significantly heavier, which may lead to fatigue during prolonged use. Realme 8 is much lighter and easier to carry around.
Build MaterialNot specifiedNot specifiedWithout this information, we cannot compare durability.

Display

FeatureSamsung Galaxy S21 Ultra 5GRealme 8Practical Impact
Size6.8"6.4"S21 Ultra offers more screen real estate, better for media consumption and multitasking. Realme 8 is more pocketable.
Resolution1440x32001080x2400S21 Ultra's display is sharper, with finer details and clearer text.
Pixel Density (PPI)515411S21 Ultra has a noticeably sharper display, with images looking crisper.
TechnologyAMOLEDAMOLEDBoth offer vibrant colors and deep blacks, but the S21 Ultra leverages its higher resolution.
Refresh Rate120Hz60HzS21 Ultra has smoother animations, especially noticeable when scrolling or gaming. Realme 8 can appear less fluid.
Brightness1500 nits1000 nitsS21 Ultra is much more readable in direct sunlight, offering better outdoor visibility.

Performance

FeatureSamsung Galaxy S21 Ultra 5GRealme 8Practical Impact
ChipsetExynos 2100 (5 nm)Mediatek Helio G95 (12 nm)S21 Ultra offers significantly faster processing, more responsive apps and smoother gaming.
AnTuTu Score749,000409,874S21 Ultra is much more powerful overall, suitable for demanding users. Realme 8 will have noticeable performance limitations.
GPUMali-G78 MP14Mali-G76 MC4S21 Ultra has a more powerful GPU, enabling higher graphics settings in games and better overall graphics performance.

Camera

FeatureSamsung Galaxy S21 Ultra 5GRealme 8Practical Impact
Standard Rear Camera108MP, f/1.8, 1/1.33"64MP, f/1.79, 1/2"S21 Ultra's larger sensor and higher resolution capture more detailed images, especially in low light.
Telephoto Camera10.8MP, f/2.4, 1/2.65" and 10.8MP, f/4.9, 1/2.65"NoneS21 Ultra offers optical zoom capabilities, crucial for lossless zooming and better portrait shots.
Selfie Camera44MP, f/2.2, 1/2.65"16MP, f/2.45, 1/3.13"S21 Ultra's front camera captures much sharper selfies, with a larger sensor and better light-gathering ability.
Wide-Angle Camera12.2MP, f/2.2, 1/2.55"8MP, f/2.25S21 Ultra has a dedicated ultrawide lens for capturing expansive scenes. Realme 8 does have a Wide angle lens but it has a smaller sensor compared to S21 Ultra
Macro CameraNone2MP, f/2.4Realme 8 can take close-up macro shots, but at a lower quality. The S21 Ultra does not have a dedicated Macro Lens but uses its ultrawide angle lens for macro photography which offers better image quality.
Black & White CameraNone2MP, f/2.4Realme 8 has a dedicated Black and White lens.
Video RecordingUp to 8K@24fpsUp to 4K@30fpsS21 Ultra offers professional-grade video recording with higher resolution and multiple frame rates.
DXOMark ScoreMobile: 115, Photo: 121, Video: 100; Selfie: Main 135, Photo 133, Video 140No DataS21 Ultra has superior and well-documented camera capabilities.
Camera Features8K Video, Optical zoom, OIS, Continuous autofocus, Manual focus, Laser AF, PDAF, Continuous shooting, Panorama, RAW, Night ModeUltra stable videoS21 Ultra boasts a wider set of pro-level features while Realme 8 offers ultra-stable video recording.

Battery

FeatureSamsung Galaxy S21 Ultra 5GRealme 8Practical Impact
Capacity5000mAh5000mAhSimilar battery life under comparable usage scenarios.
Charging Speed25W30WRealme 8 charges slightly faster.
Charging FeaturesWireless Charging 15W, Reverse Wireless 9WNoneS21 Ultra can charge wirelessly and reverse charge other devices

Software & Connectivity

FeatureSamsung Galaxy S21 Ultra 5GRealme 8Practical Impact
OSAndroid 11 (upgradable to 15)Android 11 (no upgrade info)S21 Ultra has guaranteed software updates, offering longer-term usability.
Wi-FiWi-Fi 6 (802.11ax)Wi-Fi 5 (802.11ac)S21 Ultra supports the latest Wi-Fi standard for better speeds and network performance.
Bluetooth5.25.1S21 Ultra has a slightly newer Bluetooth version, potentially offering improved connectivity.
GPSDual-band GPSSingle-band GPSS21 Ultra's dual-band GPS offers more accurate location tracking.

Storage

FeatureSamsung Galaxy S21 Ultra 5GRealme 8Practical Impact
Internal Storage128/256/512 GB64/128 GBS21 Ultra offers more storage options for users with lots of files and apps.
RAM12/16 GB4/6/8 GBS21 Ultra offers superior RAM, enabling seamless multitasking with multiple apps.
Expandable StorageNoNoNeither phone offers expandable storage.

Audio

FeatureSamsung Galaxy S21 Ultra 5GRealme 8Practical Impact
Audio QualityDolby Atmos, Hi-Res Audio, Stereo SpeakersHi-Res AudioS21 Ultra offers enhanced audio with Dolby Atmos, and stereo speakers provides a more immersive sound experience.

Security |Feature|Samsung Galaxy S21 Ultra 5G|Realme 8|Practical Impact| |---|---|---|---| |Fingerprint Sensor|Basic Fingerprint sensor|Basic Fingerprint sensor|Both offer basic fingerprint sensor functionality.|

Build Quality |Feature|Samsung Galaxy S21 Ultra 5G|Realme 8|Practical Impact| |---|---|---|---| |Screen Protection|Corning Gorilla Glass Victus|Unknown|S21 Ultra offers superior screen protection|

Sensors |Feature|Samsung Galaxy S21 Ultra 5G|Realme 8|Practical Impact| |---|---|---|---| |Sensors|Biometric: Fingerprint; Proximity: Proximity; Motion: Accelerometer, Compass, Gyroscope; Environmental: Barometer|Biometric: Fingerprint; Proximity: Proximity; Motion: Accelerometer, Gyroscope, Magnetometer|S21 Ultra offers additional environmental sensors like a barometer and compass while Realme 8 offers a magnetometer. S21 Ultra offers more sensor options useful in several applications.|

2. Key Differences Analysis

Samsung Galaxy S21 Ultra 5G Advantages:

  • Superior Display: Larger, higher resolution, higher pixel density, and a 120Hz refresh rate make it much smoother and more enjoyable for media consumption and gaming.
  • Significantly Higher Performance: The Exynos 2100 chipset provides vastly superior speed, handling heavy apps and multitasking without issues, making it better for gaming.
  • More Advanced Camera System: Multiple telephoto lenses, a higher-resolution primary sensor, and more advanced video features make it a versatile option for photography and videography.
  • Better Battery Features: Offers wireless charging and reverse wireless charging, allowing users to charge other devices.
  • Longer Software Support: Guaranteed upgrades to Android 15 and a likely longer update period overall.
  • Enhanced Audio: Dolby Atmos and stereo speakers provide a much more immersive audio experience.
  • Superior screen protection: Corning Gorilla Glass Victus offers better protection against scratches and drops.
  • Additional Sensors: Offers environmental sensors such as a barometer and compass for advanced applications and improved navigation.

Realme 8 Advantages:

  • Lighter and More Compact: Easier to handle and carry around, making it more comfortable for extended use.
  • Faster Charging: Has a slightly faster charging speed, making it quicker to top-up the battery.
  • Lower Price: Typically available at a much lower price point, making it accessible to a broader audience.
  • Macro Lens: Realme 8 offers a dedicated macro camera that the Samsung Galaxy S21 Ultra does not possess
  • Black & White Lens: Realme 8 has a dedicated Black and white lens.

Trade-offs:

  • Samsung S21 Ultra: Heavier, bulkier, and considerably more expensive than the Realme 8.
  • Realme 8: Significantly less powerful, has a lower-quality display, and a less versatile camera system.

3. User Profiles & Recommendations

Samsung Galaxy S21 Ultra 5G Ideal Users:

  • Power Users: Individuals who demand high performance for gaming, video editing, or heavy multitasking.
  • Photography Enthusiasts: Those who value a versatile camera system with great zoom capabilities, high quality images, and multiple pro-level features.
  • Media Consumers: Users who watch videos or play games frequently, and desire a large, high-quality screen with a smooth refresh rate.
  • Users desiring the best of the best: Users who need and want the best features on the market.

Specific Use Cases for S21 Ultra:

  • Professional Photography: High-quality images, RAW support, and advanced zoom for professional use.
  • Mobile Gaming: High frame rates and smooth graphics due to the powerful chipset and display.
  • Video Editing: Smooth editing experience due to the powerful processor and larger screen.
  • Content Creation: Recording high-quality 8K videos and capturing pro level videos.

Realme 8 Ideal Users:

  • Budget-Conscious Buyers: Users looking for a capable smartphone at a more affordable price point.
  • Everyday Users: People who primarily use their phones for social media, browsing, and basic communication.
  • Users who prioritize portability: Those who prefer a lightweight and comfortable phone for one-handed use.
  • Those who are keen on Macro Photography: Users who enjoy close-up photography may benefit from the dedicated Macro lens.

Specific Use Cases for Realme 8:

  • Daily Communication: Reliable for calls, texting, and social media.
  • Casual Photography: Decent performance for everyday photos and videos.
  • Basic Gaming: Suitable for less demanding games and casual gameplay.
  • Macro Photography: Capturing close-up images using its dedicated macro lens

Price-to-Value Ratio:

  • S21 Ultra: Offers premium features and top-tier performance but comes at a higher cost. Good value for those who need the best features.
  • Realme 8: Provides a solid experience for its price, making it an attractive option for users on a tight budget.

4. Decision Framework

Here are three key questions potential buyers should ask themselves:

  1. What is your budget? If the budget is limited, the Realme 8 offers a capable experience for much less.
  2. How important is performance? If you need a phone that can handle demanding tasks and gaming, the S21 Ultra is the clear choice.
  3. How important is camera quality? If photography is a priority, the S21 Ultra's advanced camera system is unmatched.

Scenario-Based Recommendations:

  • Scenario 1: Professional Photographer: Choose the Samsung Galaxy S21 Ultra for its versatile camera system and professional-level features.
  • Scenario 2: Casual User on a Budget: Choose the Realme 8 for its affordability and reliable everyday performance.
  • Scenario 3: Mobile Gamer: Choose the Samsung Galaxy S21 Ultra for its high-performance chipset, high refresh rate display, and superior graphics capabilities.
  • Scenario 4: Macro Photography Enthusiast: Choose the Realme 8 for its dedicated macro lens.

My Choice

If I had to choose, I would opt for the Samsung Galaxy S21 Ultra 5G. While the Realme 8 is a good budget phone, the S21 Ultra offers a significantly better overall experience that matches my needs and preferences. My main priorities are:

  • Top-Tier Performance: As someone who uses my phone for a variety of demanding tasks like occasional gaming and video editing, the Exynos 2100 is much better than the Helio G95.
  • Excellent Camera Quality: I appreciate the versatility of the S21 Ultra's camera system and the ability to capture high-quality images and videos.
  • Superior Display: I often consume a lot of media and play games, making the large, sharp, and smooth 120Hz AMOLED display a great feature for my needs.
  • Longer Software Support: The knowledge that the phone will be supported with the latest software for a longer time is important for me.
  • Premium Audio and other features: I love the inclusion of Dolby Atmos, Stereo Speakers, Wireless Charging and Reverse Wireless Charging.

While the S21 Ultra is more expensive, the premium features, superior performance, and future proofing make it the better choice for my specific use case. The Realme 8, while a great device for the price, simply does not offer the same level of performance or the same feature set.

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.