OnePlus 9 vs Oppo A55 - Detailed Phone Comparison

Detailed Comparison

Specification
OnePlus 9
OnePlus 9
Oneplus
Oppo A55
Oppo A55
Oppo

General

Launch Date March 26, 2021 October 1, 2021
Release Year 2021 2021

Physical

Volume 103.29 cm³ 104.03 cm³
Screen Size to Weight Ratio 3.41 "/g 3.37 "/g
Weight 192 g 193 g
Height 160 mm 163.6 mm
Width 74.2 mm 75.7 mm
Thickness 8.7 mm 8.4 mm
Foldable Design No No
Available Colors
  • Winter Mist
  • Arctic Sky
  • Astral Black
  • Green
  • Starry Black
  • Rainbow Blue

Display

Screen Size 6.55 " 6.51 "
Resolution 1080 x 2400 720 x 1600
Aspect Ratio 20:9 20:9
Screen-to-Body Ratio 87.2 % 82.6 %
Pixel Density 402 PPI 270 PPI
Refresh Rate 120 Hz N/A
Typical Brightness N/A 480 nits
HBM Brightness N/A N/A
Peak Brightness 1100 nits 550 nits

Hardware

Battery Capacity per Screen Area 104.89 mAh/in² 117.98 mAh/in²
Battery Density 43.57 mAh/cm³ 48.06 mAh/cm³
Battery Capacity 4500 mAh 5000 mAh
NFC Support Yes Yes
Chipset Qualcomm SM8350 Snapdragon 888 5G (5 nm) Mediatek MT6765G Helio G35 (12 nm)
CPU Octa-core (1x2.84 GHz Cortex-X1 & 3x2.42 GHz Cortex-A78 & 4x1.80 GHz Cortex-A55) Octa-core (4x2.3 GHz Cortex-A53 & 4x1.8 GHz Cortex-A53)
GPU Adreno 660 PowerVR GE8320

Connectivity

USB Version 3.1 2.0
OTG Support 1 1
DisplayPort
DisplayPort Version N/A N/A
USB Features USB Type-C 3.1, OTG USB Type-C 2.0, OTG

Software

Operating System Android Android
Initial OS Version 11 11
Maximum OS Version 13

Comparison Summary

Smartphone Comparison: OnePlus 9 vs. Oppo A55

1. Specifications Comparison

FeatureOnePlus 9Oppo A55Practical Impact
Design
Dimensions160 × 74.2 × 8.7 mm163.6 × 75.7 × 8.4 mmOppo A55 is slightly taller and wider, OnePlus 9 is marginally thicker. Differences are minor and unlikely to be noticeable.
Weight192g193gBoth phones are virtually identical in weight.
Display
Size6.55"6.51"Negligible size difference, both offer a similar viewing experience.
Resolution1080x2400720x1600OnePlus 9 provides a significantly sharper and more detailed display.
PPI402270OnePlus 9 has much higher pixel density resulting in text and images that look noticeably clearer.
TechnologyAMOLEDIPS LCDOnePlus 9 offers superior contrast, deeper blacks, and more vibrant colors, enhancing the viewing experience, especially for dark content or in bright sunlight.
Refresh Rate120Hz60HzOnePlus 9 displays much smoother animations, scrolling and gaming feel more fluid.
Brightness1100 nits0 nits (Not Specified)OnePlus 9 will be significantly more visible in direct sunlight. The Oppo A55's brightness is not specified, which could be a major disadvantage in outdoor visibility
Performance
ChipsetQualcomm Snapdragon 888 5G (5 nm)Mediatek Helio G35 (12 nm)OnePlus 9 offers vastly superior processing power, leading to snappier apps, smoother multitasking, and better gaming performance.
AnTuTu Score880,900379,800OnePlus 9 is significantly faster in benchmarks, indicating a much more powerful user experience.
GPUAdreno 660PowerVR GE8320OnePlus 9 provides significantly better graphics performance suitable for gaming and demanding applications.
Camera
Main Camera48MP, f/1.79, 1/1.4" Sony IMX68913MP, f/2.2OnePlus 9 has a much higher resolution and a wider aperture, leading to better low-light performance and detail.
Selfie Camera16MP, f/2.4, 1/3.13" Sony IMX4718MP, f/2.0OnePlus 9 provides higher resolution selfies, while the Oppo A55 has a wider aperture for potentially better low-light selfies.
Wide Angle Lens50MP, f/2.2, 1/1.56" Sony IMX766NoneOnePlus 9 offers a versatile wide angle camera for capturing more expansive scenes.
Portrait Camera (Depth)None2MP, f/2.4Oppo A55 includes a dedicated depth sensor, potentially improving portrait mode with a more pronounced bokeh effect
Macro CameraNone2MP, f/2.4Oppo A55 offers a macro lens for taking close-up pictures.
Black & White Camera2MP, f/2.4NoneOnePlus 9 has an additional black and white sensor which may enhance monochrome photography
VideoUp to 8K@30fpsUp to 1080p@30fpsOnePlus 9 records much higher quality video (including 8K), suitable for professional use.
Features8K Video, RAW 12 bit, OIS, moreBasic featuresOnePlus 9 has a wider range of features for photography and videography
Battery
Capacity4500mAh5000mAhOppo A55 has a slightly larger battery, potentially offering longer battery life, however this can be offset by other factors such as display technology.
Charging65W Fast Charging + 15W Wireless10W Fast ChargingOnePlus 9 charges much faster, and offers wireless charging.
Software
OSAndroid 11, upgradable to 13Android 11OnePlus 9 will get two major os updates, Oppo A55 will not receive further updates
Connectivity
WiFiWiFi 6WiFi 5OnePlus 9 supports a newer Wi-Fi standard (Wi-Fi 6), providing better performance.
Bluetooth5.25.1OnePlus 9 has a slightly newer Bluetooth standard.
GPSMultiple systemsMultiple systemsOnePlus 9 supports more satellite systems for better accuracy and faster location locking.
Storage
Internal128GB/256GB128GBOnePlus 9 offers a larger storage option, double the base capacity of Oppo A55.
RAM8GB/12GB6GB/8GBOnePlus 9 offers more RAM, supporting heavy multitasking.
Expandable StorageNoNoNeither phone has expandable storage
Audio
QualityStereo speakers, Dolby AtmosBasicOnePlus 9 provides superior audio with stereo speakers, Dolby Atmos support, and noise-canceling microphone.
Security
Fingerprint SensorBasicSide-mountedOppo A55 has a more convenient side-mounted fingerprint sensor.
Build Quality
Screen ProtectionGorilla Glass 5UnknownOnePlus 9 offers better screen protection with Gorilla Glass.
Sensors
Accelerometer, Compass, Gyroscope, Proximity, FingerprintAccelerometer, Gyroscope, Proximity, Fingerprint, Gravity, GeomagneticOnePlus 9 has a compass sensor. Oppo A55 has gravity and geomagnetic sensors

2. Key Differences Analysis

OnePlus 9 Advantages:

  • Significantly Superior Display: AMOLED, higher resolution, 120Hz refresh rate, and higher brightness leading to much better viewing experiences, especially for media and gaming.
  • Vastly Better Performance: A flagship-level Snapdragon 888 chipset offers significantly faster app loading, smoother multitasking, and high-end gaming capabilities.
  • Superior Camera System: Higher resolution main and wide-angle cameras, better low-light performance, 8K video recording, and additional features like 12-bit RAW and OIS (Optical Image Stabilization).
  • Much Faster Charging: 65W fast charging and 15W wireless charging offer a big advantage in terms of convenience and speed.
  • Enhanced Audio: Stereo speakers and Dolby Atmos provide a more immersive audio experience.
  • Future proof: Two major Android OS updates

Practical Implications: The OnePlus 9 is a high-performance device suitable for demanding users who need a fast, responsive, and feature-rich smartphone with a great display and camera.

Oppo A55 Advantages:

  • Slightly Larger Battery: A 5000mAh battery provides slightly more power for potentially better battery life.
  • Side Mounted Fingerprint Scanner: Arguably more convenient than the in-display scanner on the OnePlus 9.
  • Dedicated Portrait and Macro Lenses: Offers more options for creative photography, while not necessarily being higher quality.
  • Lower Cost: The Oppo A55 is typically sold at a lower price point, making it more budget-friendly.

Practical Implications: The Oppo A55 is suitable for budget-conscious users who prioritize basic functionality, longer battery life, and are content with a more basic performance.

Trade-offs:

  • OnePlus 9: Higher cost, less battery capacity (though faster charging mitigates this), lacks dedicated macro/depth sensors.
  • Oppo A55: Significantly lower performance, lower resolution display, basic camera system, very slow charging, and missing essential display and connectivity features.

3. User Profiles & Recommendations

OnePlus 9 Ideal User:

  • Performance Enthusiasts: Users who play demanding games, multitask heavily, and require a fast and responsive device.
  • Media Consumers: Users who watch a lot of videos, movies, and streaming content, and prioritize a vibrant display with excellent viewing angles.
  • Photography and Videography Enthusiasts: Users who want a versatile camera system with the ability to shoot high-quality photos and videos in various scenarios.
  • Tech Enthusiasts: Users who appreciate the latest technologies and features, such as a 120Hz refresh rate, fast charging, and high-end performance.

Oppo A55 Ideal User:

  • Budget-Conscious Buyers: Users who need a functional smartphone at a low price, without many frills.
  • Casual Users: Users who primarily use their phones for calling, texting, browsing social media, and basic tasks.
  • Battery Life Prioritizers: Users who need a phone that can last a full day without needing to be charged, and are not concerned about charge speed.
  • First Time Smartphone Buyers: Users who do not have any reference for quality, and may not need the premium features of the OnePlus 9.

Specific Use Cases:

  • OnePlus 9:
    • High-end gaming
    • Video editing and creation
    • Professional photography
    • Watching HDR content
    • Heavy multitasking
  • Oppo A55:
    • Basic social media use
    • Web browsing
    • Making calls/texts
    • Casual photography
    • Long battery life

Price-to-Value Ratio:

  • OnePlus 9: Offers a high performance to price ratio for users that need high-end features.
  • Oppo A55: Offers a strong value proposition for those on a strict budget.

4. Decision Framework

Key Questions for Buyers:

  1. What is your budget? The price difference between these phones is considerable.
  2. How important is performance to you? Are you a heavy gamer or multi-tasker, or do you only use your phone for basic tasks?
  3. What are your primary camera needs? Do you need high-quality photos and videos, or are basic snapshots sufficient?

Scenario-Based Recommendations:

  • Scenario 1: High performance and quality is a priority, budget isn't a major issue:
    • Recommendation: OnePlus 9. Its superior display, performance, camera, and charging capabilities provide a much better experience overall, especially for high demand users.
  • Scenario 2: Budget is the main concern, basic functionality is all that is needed:
    • Recommendation: Oppo A55. It's a budget-friendly option that provides basic functionality. However, be aware that it severely underperforms compared to the OnePlus 9.
  • Scenario 3: Need a reliable phone for daily use, but still want some premium features:
    • Recommendation: OnePlus 9. While a more expensive option, it provides a much better user experience compared to the Oppo A55 in terms of display quality, camera capabilities, and overall performance. The additional cost will be justified by the value it provides.

My Choice

Personally, I would choose the OnePlus 9. While it is more expensive, the performance difference is substantial, and the overall user experience would be significantly better. The superior display, faster charging, and more capable camera system are compelling enough to justify the higher price. As someone who often uses my phone for demanding tasks like photo editing, video streaming, and playing games, the OnePlus 9 would be a much better fit for my needs. The Oppo A55 simply does not offer the features or performance I need and would feel like a significant downgrade in terms of technology.

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.