Realme C21 vs OPPO A3
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Overview
| Specs Score | 61 / 100 | 66 / 100 Better Specs | 
| Display Resolution | 1600 x 720 pixels | 1080 x 2280 pixels Better Resolution | 
| Screen To Body Ratio | ~ 89.5% Less Bezels | |
| RAM | 3 GB | 4 GB More RAM | 
| Storage | 32 GB | 128 GB More Storage | 
| CPU Clock Speed | 2.3 GHz Faster Clock Speed | 2 GHz | 
| Rear Camera | 13 MP + 2 MP + 2 MP Triple | 16 MP Better Camera Resolution | 
| Front Camera | 5 MP | 8 MP Better Front Camera Resolution | 
| Weight | 190 g | 159 g Lighter | 
| Thickness | 8.9 mm | 7.8 mm Slimmer | 
| Battery | 5000 mAh Bigger Battery | 3400 mAh | 
| Unique Features |  Fingerprint Sensor  No  Reverse Charging |  No  FM Radio  No | 
General
| Model | RMX3201, C21 | |
| Sim Type | Dual Sim, GSM+GSM | Dual Sim, GSM+GSM | 
| Dual Sim | Yes | Yes | 
| Sim Size | Nano+Nano SIM | Nano SIM | 
| Device Type | Smartphone | Smartphone | 
| Release Date | April 8, 2021 | April, 2018 | 
Design
| Dimensions | 76.4 x 165.2 x 8.9 mm | 75.3 x 156 x 7.8 mm | 
| Weight | 190 g | 159 g | 
Display
| Type | Color IPS LCD Screen (16.7M) | Color IPS Screen (16M colors Colors) | 
| Touch | Yes, 120 Hz Touch Sampling Rate | Yes | 
| Size | 6.5 inches, 1600 x 720 pixels, 60 Hz | 6.2 inches, 1080 x 2280 pixels | 
| Aspect Ratio | 20:09 | 19:9 | 
| PPI | ~ 269 PPI | ~ 407 PPI | 
| Screen to Body Ratio | ~ 89.5% | |
| Features | 120 Hz Touch , Sunlight Screen Support, COG Sealing Process, WideVine L3 | |
| Notch | Yes, Water Drop Notch | 
Memory
| RAM | 3 GB | 4 GB | 
| Storage | 32 GB | 128 GB | 
| Card Slot | Yes, upto 256 GB | Yes | 
Connectivity
| GPRS | Yes | Yes | 
| EDGE | Yes | Yes | 
| 3G | Yes | Yes | 
| 4G | Yes | Yes | 
| VoLTE | Yes | Yes | 
| Wifi | Yes, with wifi-hotspot | Yes, with wifi-hotspot | 
| Bluetooth | Yes, v5.0 | Yes | 
| USB | Yes, microUSB | Yes, microUSB | 
| USB Features | USB on-the-go, USB Charging | USB on-the-go | 
Extra
| GPS | Yes | Yes, with A-GPS Support | 
| Fingerprint Sensor | Yes, Rear | |
| Face Unlock | Yes | |
| Sensors | Magnetic Induction Sensor, Light Sensor, Proximity Sensor, Acceleration Sensor | Accelerometer, Gyroscope, Compass | 
| 3.5mm Headphone Jack | Yes | Yes | 
| Extra Features | Night Shield, Step Tracker, Game Space, APP Market, Theme Store, Clone Phone, Phone Manager, Telephone Number Identification, TUV Rheinland Certified | 
Camera
| Rear Camera | 13 MP ƒ/2.2 (Main) 2 MP ƒ/2.4 (Macro) Macro 2 MP ƒ/2.4 Mono | 16 MP | 
| Camera Sensor | CMOS Sensor | |
| Auto Focus | Yes | Yes | 
| Features | Supports 20 Continuous Shooting, Photograph Functions: Night Mode, Panoramic View, Expert, Timelapse, Portrait Mode, HDR, Ultra Macro, AI Beauty, Filter, Chroma Boost, Video Recording Functions: Filter, Slow Motion, HDR | Face detection, Geo tagging, Panorama, Touch to focus | 
| Video Recording | 720p, 720P | 1080p @ 30 fps FHD | 
| Flash | Yes, LED | Yes, LED | 
| Front Camera | 5 MP | 8 MP | 
| Front Video Recording | 720p | 
Technical
| OS | Android v10, upgradable to v11 | Android v8.1 (Oreo) | 
| Chipset | MediaTek Helio G35 | Mediatek Helio P60 | 
| CPU | 2.3 GHz, Octa Core Processor | 2 GHz, Octa Core Processor | 
| Core Details | Arm Cortex-A53 | |
| GPU | IMG GE8320 | Mali-G72 MP3 | 
| Java | No | Yes, via 3rd party | 
| Browser | Yes | Yes, supports HTML | 
Multimedia
| Supports | MMS | |
| Yes | Yes, with Push Email | |
| Music | AAC, HE-AAC v1, HE-AAC v2, AMR, AWB, MIDI, MP3, OGG VORBIS | FLAC, MP3, eAAC+, WAV | 
| Video | MP4, 3GP, 3G2, 3GPP, 3GPP2, M4V, MKV | MP4, H.264 | 
| FM Radio | No | Yes | 
| Document Reader | Yes | 
Battery
| Type | Non-Removable Battery | Non-Removable Battery | 
| Size | 5000 mAh, Li-Po Battery | 3400 mAh, Li-ion Battery | 
| Reverse Charging | Yes | 
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