Both Realme C21Y (4GB RAM + 64GB) and Samsung Galaxy A03s (4GB RAM + 64GB) comes with same RAM. Both have the same amount of internal memory.
| Name | Realme C21Y (4GB RAM + 64GB) | Samsung Galaxy A03s (4GB RAM + 64GB) | 
| RAM | 4 GB | 4 GB | 
|---|---|---|
| Display | 6.5 in | 6.5 in | 
| Internal Memory | 64 GB | 64 GB | 
| Battery | 5000 mAh | 5000 mAh | 
| Camera | 13 MP + 2 MP + 2 MP Triple | 13 MP + 2 MP + 2 MP Triple | 
| Price | Rs. 8499 | Rs. 13990 | 
The launch Date of the first phone is August 23, 2021. The cost of Realme C21Y (4GB RAM + 64GB) is Rs. 8499. The launch Date of the second phone is August 18, 2021. The cost of Samsung Galaxy A03s (4GB RAM + 64GB) is Rs. 13990.
Realme C21Y (4GB RAM + 64GB) has IPS LCD Screen type where as Samsung Galaxy A03s (4GB RAM + 64GB) has Screen type. Samsung's phone has display density of 270 PPI & Realme's phone has only 269 PPI display density. In terms of screen to body ratio, Realme's phone has better screen to body ratio of ~ 88.7% than Samsung's phone ~ 81.8%. Both mobiles have same aspect ratio of 20:9.
Both mobiles come with 4 GB RAM and both have same Internal Memory of 64 GB.
Realme C21Y (4GB RAM + 64GB) has 13 MP + 2 MP + 2 MP Triple Rear Camera in comparison to Samsung Galaxy A03s (4GB RAM + 64GB)'s 13 MP + 2 MP + 2 MP Triple Rear Camera. Both of them stand equal in terms of Front Camera Resolution as both have 5 MP Front Camera.
Both the phones run on Android Operating System Version 11.
| Name | Realme C21Y (4GB RAM + 64GB) | Samsung Galaxy A03s (4GB RAM + 64GB) | 
| General | ||
| Model | C21Y | Galaxy A03s | 
| Sim Type | Dual Sim, GSM+GSM | Dual Sim, GSM+GSM | 
| Dual Sim | Yes | Yes | 
| Sim Size | Nano+Nano SIM | Nano+Nano SIM | 
| Device Type | Smartphone | Smartphone | 
| Release Date | August 23, 2021 | August 18, 2021 | 
| Design | ||
| Dimensions | 76 x 164.5 x 9.1 mm | 75.9 x 164.2 x 9.1 mm | 
| Weight | 200 g | 196 g | 
| Display | ||
| Type | Color IPS LCD Screen (16.7M) | Color PLS TFT LCD (16M Colors) | 
| Touch | Yes | Yes | 
| Size | 6.5 inches, 720 x 1600 pixels, 60 Hz | 6.5 inches, 720 x 1600 pixels | 
| Aspect Ratio | 20:9 | 20:9 | 
| PPI | ~ 269 PPI | ~ 270 PPI | 
| Screen to Body Ratio | ~ 88.7% | ~ 81.8% | 
| Features | Sunlight Screen Support, COG Sealing Process | |
| Notch | Yes, Water Drop Notch | Yes, Water Drop Notch | 
| Memory | ||
| RAM | 4 GB | 4 GB | 
| Storage | 64 GB | 64 GB | 
| Card Slot | Yes, upto 256 GB | Yes, upto 1 TB | 
| Connectivity | ||
| GPRS | Yes | Yes | 
| EDGE | Yes | Yes | 
| 3G | Yes | Yes | 
| 4G | Yes | Yes | 
| VoLTE | Yes, Dual Stand-By | Yes, Dual Stand-By | 
| Wifi | Yes, with wifi-hotspot | Yes, with wifi-hotspot | 
| Bluetooth | Yes, v5.0 | Yes, v5.0, A2DP | 
| USB | Yes, microUSB | Yes, USB-C v2.0 | 
| USB Features | USB Tethering, USB on-the-go, USB Charging | USB Tethering, USB on-the-go, USB Charging | 
| Extra | ||
| GPS | With A-GPS, Beidou, Glonass | Yes, with A-GPS, Glonass, Beidou, Galileo | 
| Fingerprint Sensor | Yes, Rear | Yes, Side | 
| Face Unlock | Yes | Yes | 
| Sensors | Magnetic Induction Sensor, Light Sensor, Proximity Sensor, Gyro-meter, Acceleration Sensor, Compass | Accelerometer, Light Sensor, Proximity Sensor | 
| 3.5mm Headphone Jack | Yes | Yes | 
| Camera | ||
| Rear Camera | 13 MP ƒ/2.2 (Main) 2 MP ƒ/2.4 (Macro) Macro 2 MP ƒ/2.4 Portrait  | 13 MP ƒ/2.2 (Wide Angle) 2 MP ƒ/2.4 (Macro) Macro 2 MP ƒ/2.4 (Depth Sensor)  | 
| Camera Sensor | CMOS Sensor | |
| Auto Focus | Yes | Yes | 
| Features | Beauty, Filter, HDR, Panoramic View, Refocus, Timelapse, Slo-mo, NightScape, Expert | |
| Video Recording | 1080p @ 30 fps FHD, 720P | 1080p @ 30 fps FHD | 
| Flash | Yes, LED | Yes, LED | 
| Front Camera | 5 MP ƒ/2.2 Screen Flash  | 5 MP ƒ/2.2 Screen Flash  | 
| Front Video Recording | 720p | 1080p | 
| Technical | ||
| OS | Android v11 | Android v11 | 
| Chipset | Unisoc T610 | Mediatek Helio P35 | 
| CPU | 1.8 GHz, Octa Core Processor | 2.3 GHz, Octa Core Processor | 
| Core Details | 4x2.3 GHz Cortex-A53 & 4x1.8 GHz Cortex-A53 | |
| GPU | Mali-G52 | PowerVR GE8320 | 
| Java | No | No | 
| Browser | Yes | Yes | 
| Multimedia | ||
| Yes | Yes | |
| Music | MPEG, AMRNB, AMRWB, AAC, G711.ALAW, G711.MLAW, VORBIS, OPUS, FLAC | MP3, M4A, 3GA, AAC, OGG, OGA, WAV, AMR, AWB, FLAC, MID, MIDI, XMF, MXMF, IMY, RTTTL, RTX, OTA | 
| Video | H.264, MPEG-4, H.263, Sorenson Spark, VP8, VP9, H.265 | MP4, M4V, 3GP, 3G2, AVI, FLV, MKV, WEBM | 
| FM Radio | No | No | 
| Document Reader | Yes | Yes | 
| Battery | ||
| Type | Non-Removable Battery | Non-Removable Battery | 
| Size | 5000 mAh, Li-Po Battery | 5000 mAh, Li-Po Battery | 
| Fast Charging | Yes, 15W Fast Charging | |