Both Realme C15 (4GB RAM + 64GB) and Realme C31 (4GB RAM + 64GB) comes with same RAM. Both have the same amount of internal memory.
| Name | Realme C15 (4GB RAM + 64GB) | Realme C31 (4GB RAM + 64GB) | 
| RAM | 4 GB | 4 GB | 
|---|---|---|
| Display | 6.52 in | 6.52 in | 
| Internal Memory | 64 GB | 64 GB | 
| Battery | 6000 mAh | 5000 mAh | 
| Camera | 13 MP Quad | 13 MP + 2 MP + 2 MP Triple | 
| Price | Rs. 8366 | Rs. 9490 | 
The launch Date of the first phone is August 18, 2020. The cost of Realme C15 (4GB RAM + 64GB) is Rs. 8366. The launch Date of the second phone is March 31, 2022 . The cost of Realme C31 (4GB RAM + 64GB) is Rs. 9490.
There is IPS LCD Screen Type in both the phones. Realme C31 (4GB RAM + 64GB) has display density of 270 PPI & Realme C15 (4GB RAM + 64GB) has only 269 PPI display density. Realme C15 (4GB RAM + 64GB) has 20:9 aspect ratio where as Realme C31 (4GB RAM + 64GB) has 20:08 aspect ratio.
Both phones come with 4 GB RAM and both have same Internal Memory of 64 GB.
They both have the same 13 MP Quad Rear Camera. Realme C15 (4GB RAM + 64GB) will be better choice if you're looking to click lot of selfies as it has better 8 MP Front Camera in comparison to Realme C31 (4GB RAM + 64GB)'s 5 MP Front Camera.
Both the phones has Android Operating System but the first one runs on version 10 and the second one on 11 version.
| Name | Realme C15 (4GB RAM + 64GB) | Realme C31 (4GB RAM + 64GB) | 
| General | ||
| Model | C15 | C31 | 
| 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 18, 2020 | March 31, 2022 | 
| Design | ||
| Dimensions | 75.9 x 164.5 x 9.8 mm | 76.19 x 164.74 x 8.43 mm | 
| Weight | 209 g | 197 g | 
| Display | ||
| Type | Color IPS LCD Screen (16.7M) | Color IPS LCD Screen (16.7M) | 
| Touch | Yes | Yes, 120 Hz Touch Sampling Rate | 
| Size | 6.52 inches, 720 x 1600 pixels, 60 Hz | 6.52 inches, 720 x 1600 pixels, 60 Hz | 
| Aspect Ratio | 20:9 | 20:08 | 
| PPI | ~ 269 PPI | ~ 270 PPI | 
| Screen to Body Ratio | ~ 88.7% | ~ 88.7% | 
| Glass Type | Corning Gorilla Glass | |
| Features | Screen Contrast: 1500:1, 400 nits Brightness, Color Saturation: 70%, Supports Sunlight Screen | |
| Notch | Yes, Water Drop Notch | Yes, Water Drop Notch | 
| Memory | ||
| RAM | 4 GB | 4 GB | 
| Storage | 64 GB | 64 GB | 
| Storage Type | UFS 2.2 | |
| 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 | 
| Wifi | Yes, with wifi-hotspot | Yes, with wifi-hotspot | 
| Bluetooth | Yes, v5.0, A2DP, LE, aptX | Yes, v5.0 | 
| USB | Yes, microUSB v2.0 | Yes, microUSB v2.0 | 
| USB Features | USB on-the-go, USB Charging | USB on-the-go | 
| Extra | ||
| GPS | Yes, with A-GPS, Glonass, Beidou | GPS, AGPS, GALILEO, BEIDOU | 
| Fingerprint Sensor | Yes, Rear | Yes, Side | 
| Face Unlock | Yes | Yes | 
| Sensors | Magnetic Induction Sensor, Light Sensor, Proximity Sensor, Acceleration Sensor, Compass | Magnetic Induction Sensor, Light Sensor, Proximity Sensor, Gyro-meter, Acceleration Sensor, Compass | 
| 3.5mm Headphone Jack | Yes | Yes | 
| Camera | ||
| Rear Camera | 13 MP ƒ/2.2 (Main) 8 MP ƒ/2.25 (Ultra Wide) 2 MP ƒ/2.4 Mono 2 MP ƒ/2.4 Retro | 13 MP ƒ/1.8 (Wide Angle) 2 MP (Macro) Macro 2 MP ƒ/2.4 (Depth Sensor) | 
| Camera Sensor | Sony IMX258 | |
| Auto Focus | Yes | Yes | 
| Features | Chroma Boost, Ultra-wide Mode, Beauty, Filter, HDR Mode, Panoramic View, Portrait, Timelapse, Slo-mo, Super NightScape, Expert Mode | Mode, Burst, Filter, Timelapse, Pro, Panorama, Macro, Night Pro, Portrait, HDR, 20 Continuous Shots | 
| Video Recording | 1080p @ 30 fps FHD, 720p @ 30 fps HD | 1080p, 720p, 480p | 
| Flash | Yes, LED | Yes, LED | 
| Front Camera | 8 MP ƒ/2 (Main) | 5 MP ƒ/2.2 | 
| Front Video Recording | 1080p @ 30 fps FHD | 1080p | 
| Technical | ||
| OS | Android v10, upgradable to v11 | Android v11 | 
| Chipset | MediaTek Helio G35 | Unisoc Tiger T612 | 
| CPU | 2.3 GHz, Octa Core Processor | 1.82 GHz, Octa Core Processor | 
| Core Details | Octa-core 2.3 GHz Cortex-A53 | 2x1.8 GHz Cortex-A75 & 6x1.8 GHz Cortex-A55 | 
| GPU | PowerVR GE8320 | Mali G52 | 
| Java | No | No | 
| Browser | Yes, supports HTML5 | Yes | 
| Multimedia | ||
| Yes | Yes | |
| Music | AAC, HE-AAC v1, HE-AAC v2, AMR, AWB, MIDI, MP3, OGG, VORBIS | AAC, APE, FLAC, AMR, MIDI, MP3, OGG, WAV, WMA, MKA | 
| Video | MP4, 3GP, 3G2, 3GPP, 3GPP2, M4V, MKV | MP4, 3GP, ASF, AVI, FLV, M2TS, MKV, MPG, TS, WEBM, WMV | 
| FM Radio | Yes | No | 
| Document Reader | Yes | Yes | 
| Battery | ||
| Type | Non-Removable Battery | Non-Removable Battery | 
| Size | 6000 mAh, Li-Po Battery | 5000 mAh, Li-Po Battery | 
| Fast Charging | Yes, 18W Fast Charging | |
| StandBy Time | 57 days | |
| Talk Time | 46 hours | |
| Music Playback Time | 60 hours | |