Xiaomi Redmi 9C vs Oppo A55 - Detailed Phone Comparison

Detailed Comparison

Specification
Oppo A55
Oppo A55
Oppo

General

Launch Date August 12, 2020 October 1, 2021
Release Year 2020 2021

Physical

Volume 114.28 cm³ 104.03 cm³
Screen Size to Weight Ratio 3.33 "/g 3.37 "/g
Weight 196 g 193 g
Height 164.9 mm 163.6 mm
Width 77 mm 75.7 mm
Thickness 9 mm 8.4 mm
Foldable Design No No
Available Colors
  • Midnight Gray
  • Sunrise Orange
  • Twilight Blue
  • Green
  • Starry Black
  • Rainbow Blue

Display

Screen Size 6.53 " 6.51 "
Resolution 720 x 1600 720 x 1600
Aspect Ratio 20:9 20:9
Screen-to-Body Ratio 81.1 % 82.6 %
Pixel Density 269 PPI 270 PPI
Refresh Rate N/A N/A
Typical Brightness 400 nits 480 nits
HBM Brightness N/A N/A
Peak Brightness N/A 550 nits

Hardware

Battery Capacity per Screen Area 117.26 mAh/in² 117.98 mAh/in²
Battery Density 43.75 mAh/cm³ 48.06 mAh/cm³
Battery Capacity 5000 mAh 5000 mAh
NFC Support No Yes
Chipset Mediatek MT6765G Helio G35 (12 nm) Mediatek MT6765G Helio G35 (12 nm)
CPU Octa-core (4x2.3 GHz Cortex-A53 & 4x1.8 GHz Cortex-A53) Octa-core (4x2.3 GHz Cortex-A53 & 4x1.8 GHz Cortex-A53)
GPU PowerVR GE8320 PowerVR GE8320

Connectivity

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

Software

Operating System Android Android
Initial OS Version 10 11
Maximum OS Version

Comparison Summary

1. Specifications Comparison

Design

FeatureXiaomi Redmi 9COppo A55Practical Impact
Dimensions164.9 × 77 × 9 mm163.6 × 75.7 × 8.4 mmRedmi 9C is slightly larger and thicker, potentially less comfortable for one-handed use. Oppo A55 is more pocketable.
Weight196g193gNegligible difference in weight.
BuildNot specifiedNot specifiedWithout details on materials, hard to assess durability.
Fingerprint SensorRear-mountedSide-mountedSide-mounted sensors are generally faster and more ergonomic, especially for right-handed users.

Display

FeatureXiaomi Redmi 9COppo A55Practical Impact
Size6.53"6.51"Virtually identical screen size; negligible difference.
Resolution720x1600720x1600Same sharpness, but lower resolution can appear less crisp compared to FHD displays, especially for reading text.
PPI269270Virtually identical pixel density.
TechnologyIPS LCDIPS LCDSimilar color accuracy and viewing angles.
Refresh Rate60Hz60HzStandard refresh rate, not as smooth as 90Hz or 120Hz displays found on more expensive phones.
Brightness0 nits0 nitsThe peak brightness is not specified so it is hard to estimate how visible both displays will be in direct sunlight.

Performance

FeatureXiaomi Redmi 9COppo A55Practical Impact
ChipsetMediatek MT6765G Helio G35 (12 nm)Mediatek MT6765G Helio G35 (12 nm)Same chipset, means similar base-level performance for basic tasks.
AnTuTu Score110,490379,800Massive difference in performance. The Oppo A55 will offer a significantly smoother experience, especially with demanding apps and multitasking.
GPUPowerVR GE8320 (IMG PowerVR GE8320)PowerVR GE8320 (Arm Mali-G57 MC2)The Oppo A55 has a much better GPU meaning that it will perform much better in gaming.
RAM2/3/4 GB6/8 GBOppo A55 offers significantly more RAM, leading to better multitasking capabilities and less app reloading.

Camera

FeatureXiaomi Redmi 9COppo A55Practical Impact
Main Camera13MP, f/2.213MP, f/2.2Similar main camera performance in good lighting conditions.
Selfie Camera5MP, f/2.28MP, f/2.0Oppo A55 has a higher resolution and wider aperture, resulting in better selfies, especially in low light.
Portrait Lens2MP, f/2.42MP, f/2.4Similar depth sensing for portrait mode.
Macro Lens2MP, f/2.42MP, f/2.4Similar macro capabilities for close-up shots.
Video1080p@30fps, No stabilization, No slow motion1080p@30fps, Digital image stabilization, 120fps slow motionOppo A55's image stabilization improves video quality. The slow-motion capabilities add creative options.
FeaturesDigital Zoom, Continuous Shooting4K Video, Digital Image Stabilization, PDAFOppo A55 offers more advanced features such as 4k video and PDAF.

Battery

FeatureXiaomi Redmi 9COppo A55Practical Impact
Capacity5000mAh5000mAhSimilar battery life under typical usage.
Charging10W, Li-Ion10W, Li-PolymerBoth phones have the same charging speed which is very slow.
RemovableNoNoBoth batteries are non-removable.

Software and Connectivity

FeatureXiaomi Redmi 9COppo A55Practical Impact
OSAndroid 10Android 11Oppo A55 has a newer OS, potentially offering more features and security updates.
Wi-Fi802.11 b/g/n802.11 a/b/g/n/acOppo A55 supports faster Wi-Fi standards (802.11ac), offering better performance on compatible networks.
Bluetooth5.05.1Oppo A55 has a newer Bluetooth version for improved connectivity and audio codec support (aptX, LDAC).
GPSGPS, A-GPS, GLONASS, BeidouGPS, A-GPS, GLONASS, Beidou, QZSS, GalileoOppo A55 provides more accurate location tracking with additional satellite systems.
Storage32/64/128 GB128 GBOppo A55 only comes in 128GB
Expandable StorageNoNoNo expandable storage on either phone.

2. Key Differences Analysis

Xiaomi Redmi 9C Advantages:

  • Potentially lower price (depending on the specific configuration).

Oppo A55 Advantages:

  • Significantly better performance: Higher AnTuTu score indicates a much smoother and faster user experience for everyday tasks, gaming, and multitasking.
  • Better Camera Performance: Better front facing camera.
  • Newer Software: Comes with Android 11 out of the box, likely to receive more updates.
  • Better connectivity: The Oppo A55 offers better connectivity, especially with the newer Wi-Fi and Bluetooth versions.
  • More RAM: Oppo A55 has way more RAM so multitasking and app loading will be a much better experience.
  • Gyroscope: Oppo A55 has a gyroscope which is better for gaming and other applications.

Trade-offs:

  • Choosing the Redmi 9C means sacrificing performance, camera quality, and connectivity for potentially a lower price.

3. User Profiles & Recommendations

Xiaomi Redmi 9C:

  • Ideal User: Budget-conscious users with very basic smartphone needs.
  • Use Cases: Simple calling, texting, basic social media, and light web browsing.
  • Justification: Suitable for those who prioritize affordability above all else.

Oppo A55:

  • Ideal User: Users who need a reliable and responsive phone for daily tasks, multimedia consumption, and casual gaming.
  • Use Cases: Social media, video streaming, photography, light gaming, and multitasking.
  • Justification: Offers a much better user experience for the money, particularly if the price difference isn't substantial.

4. Decision Framework

Key Questions for Buyers:

  1. What is my absolute maximum budget? If the Redmi 9C is significantly cheaper, and budget is the primary concern, it might be the only option.
  2. How important is performance? If you plan to use demanding apps or games, or multitask frequently, the Oppo A55 is the clear winner.
  3. How important is camera quality? The Oppo A55's better selfie camera and features make it a better choice for photography enthusiasts.

Scenario-Based Recommendations:

  • Scenario 1: Extremely Tight Budget: Choose the Redmi 9C, understanding the performance limitations.
  • Scenario 2: Balanced Budget & Performance: The Oppo A55 offers a significantly better experience for a relatively small price increase.
  • Scenario 3: Photography Focus: The Oppo A55 is better because it has an overall better camera.

My Choice

I would choose the Oppo A55. The significantly better performance, combined with the superior camera and newer software, make it a much more compelling device. While the Redmi 9C might be slightly cheaper, the Oppo A55 offers a much better user experience that is well worth the extra cost, making it the better value proposition overall. The improved multitasking capabilities and smoother performance are key factors for my daily usage.

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.

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Bridging technical complexity with engaging, accessible narratives.