Oppo F31 5G vs OPPO K13x 5G (8GB RAM +128GB)

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Overview

Specs Score79 / 100
Better Specs
78 / 100
Display Resolution1080 x 2412 pixels
Better Resolution
720 x 1604 pixels
Front Camera16 MP
Better Front Camera Resolution
8 MP
Weight194 g
Lighter
Thickness7.9 mm
Slimmer
Battery7000 mAh
Bigger Battery
6000 mAh
Unique Features
No
No
Water Resistant
Reverse Charging
IR Blaster
3.5mm Audio Jack
FM Radio
No
No
No

General

Country of OriginIndiaIndia
ModelCPH2781K13x
Sim TypeDual Sim, GSM+GSM (Hybrid Slot)Dual Sim, GSM+GSM (Hybrid Slot)
Dual SimYesYes
Sim SizeNano+Nano SIMNano+Nano SIM
Device TypeSmartphoneSmartphone
Release DateSeptember 15, 2025June 23, 2025
In The BoxHandset, Charger, USB Data Cable, Sim Ejector Tool, Quick Guide, Protective CaseHandset, Charger, USB Data Cable, Sim Ejector Tool, Quick Guide, Protective Case

Design

Dimensions76.2 x 165.7 x 7.9 mm
Weight194 g
ColorsMidnight Violet

Display

TypeColor AMOLED Screen (16M Colors)Color HD+ LCD (16.7 Million)
TouchYes, 360 Hz Touch Sampling RateYes, 240 Hz Touch Sampling Rate
Size6.57 inches, 1080 x 2412 pixels, 120 Hz6.67 inches, 720 x 1604 pixels, 120 Hz
Aspect Ratio20:920:9
PPI~ 402 PPI~ 264 PPI
Screen to Body Ratio~ 92.2%~ 89.9%
Glass TypeAGC DT-Star D+
BrightnessBrightness: 850nit (Normal), 1000nit (HBM)
Features10 Touch Points, Contrast Ratio: 1500:1 (Typical), Color Saturation: 83% NTSC, Color Gamut: 88% DCI-P3 (Vivid Mode), 100% sRGB (Natural Mode), Supports Dark Mode, DC Dimming, Supports Eye Comfort, Supports Sunlight Screen
NotchYes, Punch HoleYes, Punch Hole

Memory

RAM8 GB8 GB
Expandable RAMUpto 8 GB Extra Virtual RAM
Storage128 GB128 GB
Storage TypeUFS 2.2UFS
Card SlotYes, (Hybrid Slot)Yes, (Hybrid Slot), upto 2 TB

Connectivity

GPRSYesYes
EDGEYesYes
3GYesYes
4GYesYes
5GYesYes
5G Bandsn1/n3/n5/n7/n8/n20/n28A/n28B/n66/n38/n40/n41/n77/n78n1/n3/n5/n8/n28B/n40/n41/n77/n78
VoLTEYes, Dual Stand-ByYes
WifiYes, with wifi-hotspotYes, with wifi-hotspot
Wifi Version802.11 a/b/g/n/ac, Wi-Fi 5 (802.11 ac), 802.11 a/b/g/n, WLAN (2.4 GHz | 5 GHz), WLAN Display, WLAN Tethering, 1 x 1 SOSOWiFi 5 (802.11 ac), 802.11 b/g/a/n, WLAN 2.4 GHz, WLAN 5 GHz, Dual Band (WiFi 2.4 GHz, WiFi 5 GHz)
BluetoothYes, v5.4, Support SBC, AAC, aptX, aptX HD, LDAC, LHDCYes, v5.4, SBC, AAC, aptX, aptX HD, and LDAC
USBYes, USB-C v2.0Yes, USB-C v2.0
USB FeaturesUSB on-the-go, USB ChargingUSB Tethering, USB on-the-go, USB Charging
IR BlasterYes

Extra

GPSYes, with A-GPS, GLONASS, BDS, GALILEO, QZSSYes, BEIDOU, GPS, GLONASS, GALILEO, QZSS, AGPS
Fingerprint SensorYes, SideYes, Side
Face UnlockYesYes
SensorsGeomagnetic Induction, Ambient Light Induction, Proximity Sensor, Acceleration Sensor, Gravity Sensor, Gyroscope, Infrared Sensor, Step Recording Function, Facial Recognition SensorProximity Sensor, Ambient Light Sensor, E-Compass, Accelerometer
3.5mm Headphone JackNoYes
AI FeaturesSmart Document (AI summaries, translations, rewriting), Smart Note (AI-enhanced note-taking), and high-quality scanning. Integrated Google Gemini delivers multimodal AI intelligenceAI Eraser, AI Clarity Enhancer, AI Smart Image Matting 2.0, AI Reflection Remover, AI Unblur, AI Motion, AI Portrait, AI Reimage, AI Summary, AI Writer
Water ResistanceYes1.18 m upto 1.05 min
Splash ResistantYes
IP RatingIP69+IP68+IP66IP65
Dust ResistantYesYes
Extra Features4300 mm² VC cooling systemDual-view Video, Outdoor Mode and Glove Touch, Ultra-Volume Mode, Trinity Engine, Screen Translator, Google Gemini App

Camera

Rear Camera50 MP ƒ/1.8 (Wide Angle)
Sensor: OV50D40, Sensor size: 1/2.88″, Single pixel size: 0.612 um, Aperture size: f/1.8, Focal length: 27 mm, Lens configuration: 5P, Supporting AF
2 MP
Sensor: GC02M1-C24YK, Sensor size: 1/5″, Single pixel size: 1.75 um, Aperture size: f/2.4, Focal length: 22 mm, Lens configuration: 3P
50 MP ƒ/1.8 (Wide Angle)
OV50D, 1/2.88 inch Sensor Size, 0.61um Pixel Size, CMOS(4-in-1), FOV: 76 Degree, Equivalent Focal Length: 27mm, 5P Lens, Effective Focal Length: 3.98mm, PDAF
2 MP ƒ/2.4 (Depth Sensor)
1.75um Pixel Size, CMOS, 1/5 inch Sensor Size, FOV: 89 Degree, Equivalent Focal Length: 22mm, 3P Lens, Effective Focal Length: 1.77mm, Fixed Focus)
Auto FocusYesYes
FeaturesPhoto, Video, Portrait, Night, Pro, Panorama, Slo-Mo, Dual View Video, Timelapse, Sticker, Hypertext, Hi-Res, Google Lens, Supports Fill Light for Video Shooting
Video Recording1080p @ 30 fps FHD, 720p1080p @ 60 fps FHD, 720p @ 30 fps HD
FlashYes, LEDYes, LED
Front Camera16 MP (Wide Angle)
Sensor size: 1/3.09″, Single pixel size: 1.0 um, Aperture size: f/2.4, Focal length: 23 mm, Lens configuration: 4P
Punch Hole
8 MP ƒ/2 (Wide Angle)
1.12um Pixel Size, CMOS, 1/4 inch Sensor Size, FOV: 80 Degree, Equivalent Focal Length: 25mm, 4P Lens, Effective Focal Length: 2.66mm, Fixed Focus
Punch Hole
Front Video Recording1080p @ 30 fps FHD1080p @ 30 fps FHD, 720p @ 30 fps HD

Technical

OSAndroid v15Android v15
Custom UIColorOS 15ColorOS 15
ChipsetMediatek Dimensity 6300Mediatek Dimensity 6300
CPU2.4 GHz, Octa Core Processor2.4 GHz, Octa Core Processor
Core Details2X Arm Cortex-A76@2.4GHz & 6X Arm Cortex-A55@2.0GHz2X Arm Cortex-A76@2.4GHz & 6X Arm Cortex-A55@2.0GHz
GPUArm Mali-G57 MC2ARM Mali-G57 MC2
JavaNoNo
BrowserYesYes

Multimedia

EmailYesYes
MusicYesMP3, AAC, AMR, APE, OGG, FLAC, WAV, MIDI, WMA
VideoYesAVI, 3GP, MP4, WMV, MKV, MOV, ASF, FLV, Webm, TS
FM RadioNoYes, with FM Recording
Document ReaderYesYes

Battery

TypeNon-Removable BatteryNon-Removable Battery
Size7000 mAh6000 mAh, Li-ion Battery
Fast ChargingYes, 80W SUPERVOOC ChargingYes, 45W SUPERVOOCTM Flash Charging
Reverse ChargingYes

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