Both OPPO A57 4G (4GB RAM + 64 GB) and Oppo A15s (4GB RAM + 128GB) comes with same RAM. In terms of display resolution, OPPO A57 4G (4GB RAM + 64 GB) has better resolution of 1612 x 720 than Oppo A15s (4GB RAM + 128GB) which has resolution of 1600 x 720. Oppo A15s (4GB RAM + 128GB) has more internal memory than OPPO A57 4G (4GB RAM + 64 GB)
| Name | OPPO A57 4G (4GB RAM + 64 GB) | Oppo A15s (4GB RAM + 128GB) | 
| RAM | 4 GB | 4 GB | 
|---|---|---|
| Display | 6.56 in | 6.52 in | 
| Internal Memory | 64 GB | 128 GB | 
| Battery | 5000 mAh | 4230 mAh | 
| Camera | 13 MP + 2 MP Dual | 13 MP + 2 MP + 2 MP Triple | 
| Price | Rs. 16990 | Rs. 10434 | 
The launch Date of the first phone is May 27, 2022. The cost of OPPO A57 4G (4GB RAM + 64 GB) is Rs. 16990. The launch Date of the second phone is December 16, 2020. The cost of Oppo A15s (4GB RAM + 128GB) is Rs. 10434.
Oppo A15s (4GB RAM + 128GB) has screen size of 6.52 inches which falls short to OPPO A57 4G (4GB RAM + 64 GB)'s 6.56 inch screen. There is IPS LCD Screen Type in both the phones. Both have same 269 PPI. In terms of screen to body ratio, OPPO A57 4G (4GB RAM + 64 GB) has better screen to body ratio of ~ 89.8% than Oppo A15s (4GB RAM + 128GB)'s ~ 83%. Both phones have same aspect ratio of 20:9.
Both phones come with 4 GB RAM Oppo A15s (4GB RAM + 128GB) has more Internal Memory (128 GB) than OPPO A57 4G (4GB RAM + 64 GB) (64 GB).
They both have the same 13 MP + 2 MP Dual Rear Camera. Both of them stand equal in terms of Front Camera Resolution as both have 8 MP Front Camera.
Both the phones has Android Operating System but the first one runs on version 12 and the second one on 10 version.
| Name | OPPO A57 4G (4GB RAM + 64 GB) | Oppo A15s (4GB RAM + 128GB) | 
| General | ||
| Model | A57 4G | A15s | 
| 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 | May 27, 2022 | December 16, 2020 | 
| Design | ||
| Dimensions | 75.03 x 163.74 x 7.99 mm | 75.4 x 164 x 7.9 mm | 
| Weight | 187 g | 177 g | 
| Display | ||
| Type | Color IPS LCD Screen (16.7M) | Color IPS LCD Screen (16M Colors) | 
| Touch | Yes | Yes | 
| Size | 6.56 inches, 720 x 1612 pixels, 60 Hz | 6.52 inches, 720 x 1600 pixels, 60 Hz | 
| Aspect Ratio | 20:9 | 20:9 | 
| PPI | ~ 269 PPI | ~ 269 PPI | 
| Screen to Body Ratio | ~ 89.8% | ~ 83% | 
| Glass Type | Panda MN228 | |
| Features | 480 nits (typ), 600 nits (HBM) | |
| Notch | Yes, Water Drop Notch | Yes, Water Drop Notch | 
| Memory | ||
| RAM | 4 GB | 4 GB | 
| Expandable RAM | Upto 4 GB Extra Virtual RAM | |
| Storage | 64 GB | 128 GB | 
| Card Slot | Yes | Yes, upto 256 GB | 
| Connectivity | ||
| GPRS | Yes | Yes | 
| EDGE | Yes | Yes | 
| 3G | Yes | Yes | 
| 4G | Yes | Yes | 
| 5G | No | |
| VoLTE | Yes, Dual Stand-By | Yes | 
| Wifi | Yes, with wifi-hotspot | Yes, with wifi-hotspot | 
| Wifi Version | IEEE 802.11a/b/g/n/ac | |
| Bluetooth | Yes, v5.3, A2DP, LE, aptX HD | Yes, v5.0, A2DP, LE | 
| USB | Yes, USB-C v2.0 | Yes, microUSB v2.0 | 
| USB Features | USB on-the-go | USB on-the-go, USB Charging | 
| Extra | ||
| GPS | Yes, with A-GPS, GLONASS, GALILEO, BDS, QZSS | Yes, with A-GPS, GLONASS, BDS | 
| Fingerprint Sensor | Yes, Side | Yes, Rear | 
| Face Unlock | Yes | Yes | 
| Sensors | Accelerometer, Gyro, Proximity, Compass | Accelerometer, Proximity, Compass | 
| 3.5mm Headphone Jack | Yes | Yes | 
| Camera | ||
| Rear Camera | 13 MP ƒ/2.2 (Wide Angle) 2 MP ƒ/2.4 (Depth Sensor) | 13 MP ƒ/2.2 (Wide Angle) 2 MP ƒ/2.4 (Macro) Macro 2 MP ƒ/2.4 (Depth Sensor) | 
| Auto Focus | Yes | Yes | 
| Features | HDR, Panorama | Professional Mode, Night Mode, Panorama Mode, Portrait, Time-lapse Photography, Slow Motion | 
| Video Recording | 1080p @ 30 fps FHD | 1080p @ 30 fps FHD | 
| Flash | Yes, LED | Yes, LED | 
| Front Camera | 8 MP ƒ/2 (Wide Angle) | 8 MP ƒ/2.4 (Wide Angle) | 
| Front Video Recording | 1080p @ 30 fps FHD | 1080p | 
| Technical | ||
| OS | Android v12 | Android v10 | 
| Chipset | MediaTek Helio G35 | Mediatek Helio P35 | 
| CPU | 2.3 GHz, Octa Core Processor | 2.3 GHz, Octa Core Processor | 
| Core Details | 4x2.3 GHz Cortex-A53 & 4x1.8 GHz Cortex-A53 | 4x2.3 GHz Cortex-A53 & 4x1.8 GHz Cortex-A53 | 
| GPU | PowerVR GE8320 | PowerVR GE8320 | 
| Java | No | No | 
| Browser | Yes | Yes, supports HTML5 | 
| Multimedia | ||
| Yes | Yes | |
| Music | Yes | Yes | 
| Video | Yes | Yes | 
| FM Radio | No | Yes | 
| Document Reader | Yes | Yes | 
| Battery | ||
| Type | Non-Removable Battery | Non-Removable Battery | 
| Size | 5000 mAh, Li-Po Battery | 4230 mAh, Li-Po Battery | 
| Fast Charging | Yes, 33W Fast Charging | |