Samsung Galaxy S21 FE 5G vs Xiaomi Redmi A3x - Detailed Phone Comparison

Detailed Comparison

Specification

General

Launch Date January 7, 2022 May 24, 2024
Release Year 2022 2024

Physical

Volume 91.64 cm³ 106.65 cm³
Screen Size to Weight Ratio 3.62 "/g 3.48 "/g
Weight 177 g 193 g
Height 155.7 mm 168.4 mm
Width 74.5 mm 76.3 mm
Thickness 7.9 mm 8.3 mm
Foldable Design No No
Available Colors
  • White
  • Graphite
  • Lavender
  • Olive
  • Midnight Black
  • Olive Green
  • Moonlight White (Starry White)
  • Aurora Green (Ocean Green)

Display

Screen Size 6.4 " 6.71 "
Resolution 1080 x 2340 720 x 1650
Aspect Ratio 19.5:9 21:9
Screen-to-Body Ratio 86.7 % 82.9 %
Pixel Density 403 PPI 268 PPI
Refresh Rate 120 Hz 90 Hz
Typical Brightness N/A 500 nits
HBM Brightness N/A N/A
Peak Brightness N/A N/A

Hardware

Battery Capacity per Screen Area 109.86 mAh/in² 111.05 mAh/in²
Battery Density 49.11 mAh/cm³ 46.88 mAh/cm³
Battery Capacity 4500 mAh 5000 mAh
NFC Support Yes No
Chipset Qualcomm SM8350 Snapdragon 888 5G (5 nm) - Version 1 Unisoc T603 (22 nm)
CPU Octa-core (1x2.84 GHz Cortex-X1 & 3x2.42 GHz Cortex-A78 & 4x1.80 GHz Cortex-A55) - Version 1 Octa-core 1.8 GHz
GPU Adreno 660 - Version 1 8

Connectivity

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

Software

Operating System Android Android
Initial OS Version 12 14
Maximum OS Version 16 16

Comparison Summary

Alright, let's dive into a head-to-head comparison of the Samsung Galaxy S21 FE 5G and the Xiaomi Redmi A3x. We'll break down the specs, analyze what they mean for you, and help you decide which phone might be the better fit.

1. Specifications Breakdown

Here's a detailed comparison, breaking down specs into categories with a focus on real-world implications:

FeatureSamsung Galaxy S21 FE 5GXiaomi Redmi A3xReal-World Implications
Design
Launch Date2022-01-072024-05-24Redmi A3x is much newer with updated software and potentially longer support.
Dimensions155.7 x 74.5 x 7.9 mm168.4 x 76.3 x 8.3 mmS21 FE is smaller and more pocketable. Redmi A3x is larger and might feel bulkier.
Weight177g193gS21 FE is significantly lighter, feels more comfortable for long use.
Display
Size6.4"6.71"Redmi A3x offers a larger screen, potentially better for media consumption.
Resolution1080x2340720x1650S21 FE has a sharper, more detailed display. Text and images will look clearer.
Pixel Density (PPI)403268S21 FE offers a much crisper image than Redmi A3x.
TechnologyAMOLEDIPS LCDS21 FE has superior contrast, deeper blacks, and vibrant colors and it is more power efficient with dark themes.
Refresh Rate120Hz90HzS21 FE offers smoother scrolling and animations.
Brightness (nits)13000S21 FE is significantly better for outdoor visibility, especially in bright sunlight.
Performance
ChipsetSnapdragon 888 (5nm)Unisoc T603 (22nm)S21 FE's chipset is vastly more powerful, offering much better performance for gaming and demanding tasks.
AnTuTu Score923,836239,000S21 FE is a much more responsive and capable phone for any task.
GPUAdreno 660Mali-G57 MP1S21 FE will handle high-end graphics much better (gaming, video editing).
Battery
Capacity4500mAh5000mAhRedmi A3x has a larger battery that may offer a slightly longer usage time, however this is likely offset by the weaker chipset.
Charging25W Fast Charging10W Fast ChargingS21 FE will charge faster.
Battery FeaturesWireless Charging, Reverse ChargingNon-removableS21 FE offers convenient charging options not available on the Redmi A3x.
Camera
Rear Main Camera12MP, f/1.88MP, f/2.2S21 FE has better low-light performance and image quality.
Telephoto Camera8MP, f/2.0NoneS21 FE offers optical zoom for better quality at distant subjects.
Wide Angle Camera13MP, f/2.2NoneS21 FE can capture wider shots.
Selfie Camera32MP, f/2.25MP, f/2.2S21 FE takes much higher resolution and better quality selfies.
Video RecordingUp to 4K@60fps1080p@30fpsS21 FE can record much higher quality, smoother videos.
FeaturesOIS, 4k Video, Optical ZoomDual Camera, AutofocusS21 FE offers significantly more advanced camera features.
Software & Connectivity
OSAndroid 12 (up to 16)Android 14 (up to 16)Redmi A3x comes with a newer version of Android.
WiFiWiFi 6 (802.11ax)802.11acS21 FE supports faster and more reliable WiFi speeds.
Bluetooth5.0 LE4.2 LES21 FE has a more modern Bluetooth version with better stability and battery performance.
GPSGPS, A-GPS, GLONASS, Beidou, GalileoGPS, A-GPS, GLONASS, BeidouS21 FE offers slightly better GPS accuracy with additional Galileo support.
Storage & Audio
Internal Storage128/256GB64/128GBS21 FE offers more storage options.
RAM6/8GB3/4GBS21 FE is better for multitasking.
Expandable StorageNoNoNeither phone supports expandable storage.
AudioDolby Atmos, Stereo SpeakersBasic Audio featuresS21 FE offers a superior audio experience with better sound quality.
Security & Build Quality
Fingerprint Sensorbasic in-displayside-mountedRedmi A3x features a more advanced fingerprint sensor.
Screen ProtectionGorilla Glass VictusGorilla Glass 3S21 FE offers much better protection against screen scratches and drops.

2. Key Insights

Samsung Galaxy S21 FE 5G Strengths:

  • Superior Performance: The Snapdragon 888 chipset provides flagship-level performance for demanding tasks, gaming, and multitasking.
  • High-Quality Display: The AMOLED display with a 120Hz refresh rate offers vibrant colors, deep blacks, and smooth visuals, along with higher peak brightness.
  • Advanced Camera System: Features like OIS, 4K recording, and a versatile triple-lens setup produce much better photos and videos.
  • Premium Features: Wireless charging, reverse charging, and stereo speakers add convenience and value.
  • Better Build Quality: Gorilla Glass Victus offers excellent screen protection and durability.

Xiaomi Redmi A3x Strengths:

  • Larger Display: The 6.71" screen is good for media consumption and those who prefer larger phones.
  • Larger Battery: The 5000mAh battery is likely to offer longer battery life for basic usage.
  • Newer OS out of the box: Comes with Android 14.
  • Side-Mounted Fingerprint Sensor: Arguably more reliable and convenient than in-display sensors.
  • Price: Likely more budget-friendly.

Trade-offs and Limitations:

  • S21 FE: Older device compared to the Redmi A3x, but benefits from higher end specifications.
  • Redmi A3x: Sacrifices performance, camera quality, display quality and build materials to achieve a budget-friendly price point.

3. User Profiles and Recommendations

Samsung Galaxy S21 FE 5G is best for:

  • Power users: Those who need a responsive device for gaming, multitasking, and demanding apps.
  • Photography enthusiasts: Users who want a high-quality camera system with versatile features.
  • Media lovers: People who appreciate a vibrant, smooth display with good audio and video capabilities.
  • Tech Enthusiasts: Those who want modern features like wireless charging and premium build quality.

Xiaomi Redmi A3x is best for:

  • Budget-conscious users: People looking for an affordable phone for basic tasks like calls, social media, and casual browsing.
  • Casual users: Those who prioritize battery life and a larger screen over top-tier performance and image quality.
  • Users with basic needs: Those who don't require intensive apps or advanced features and simply want a functional smartphone.

4. Buying Decision Framework

Here are three practical questions to guide your decision:

  1. What is your budget? The Redmi A3x is likely much more affordable, if budget is the primary concern.
  2. How important is performance? If you need a phone that can handle gaming, intensive apps, or multitasking, the S21 FE is the clear choice.
  3. How important is camera quality? If you value capturing photos and videos with high quality, the S21 FE offers a significantly better experience.

Scenario-Based Recommendations:

  • "I need a reliable phone for work and entertainment": The Samsung Galaxy S21 FE 5G is the superior option due to its performance, display, and overall features.
  • "I just want a phone for basic tasks and prefer a large screen": The Xiaomi Redmi A3x will be adequate and cost less.
  • "I am looking for the best overall value for the money": This is tricky, it depends on your priorities. If you want performance, build quality, and camera, the S21 FE would be a better value at the cost of a higher price point. If you just want a basic smartphone, then the A3x might be the better value.

My Choice

If I were choosing between the two, I would personally opt for the Samsung Galaxy S21 FE 5G. While it's an older device, the trade-offs I would make with the Redmi A3x are not palatable. The vastly superior performance of the Snapdragon 888, combined with the much better display, camera system, and build quality, outweighs its age. I also value having premium features like wireless charging and stereo speakers. Although the A3x has a larger battery, the weaker chipset will likely negate any benefits. Overall, the S21 FE would provide me with the better experience.

In short, the S21 FE is a more capable device while the A3x is a much more budget oriented device and comes down to what one needs in a smartphone.

Alex Griffin
Alex Griffin

Technology analyst specializing in mobile devices and consumer electronics.

Core Expertise

  • Mobile technology analysis
  • Consumer electronics evaluation
  • Technical specification interpretation
  • User experience insights

Professional Mission Empowering readers to make informed technology decisions by transforming intricate specifications into understandable, practical guidance.

Demystifying technology, one device at a time.