Home Phone comparison Realme 15 5G and Samsung Galaxy A51 - Which is better?

Realme 15 5G vs Samsung Galaxy A51

70 out 100
Realme 15 5G
VS
41 out 100
Samsung Galaxy A51
Realme 15 5G
Samsung Galaxy A51

Compared 2 smartphones : Realme 15 5G Manufactured in July, 2025, with display 6.8 with chipsetMediaTek Dimensity 7300 Plus, vs Samsung Galaxy A51, Manufactured in December, 2019with chipsetSamsung Exynos 9 Octa 9611. Below are specs, tests, pros and cons for each device

  1. Differences
  2. Review
  3. Specs
  4. Benchmarks
  5. Battery Life
  6. Cameras
  7. Comments (0)

Key Differences

Device key advantages
Reasons to choose Realme 15 5G
  • Larger display: 6.8in
  • Higher pixel density: 453ppi
  • Higher refresh rate: 144Hz
  • Higher battery capacity: 7000mAh vs 4000mAh
  • Newer Bluetooth version: 5.4 vs 5
  • Infrared port
  • Includes charger
Reasons to choose Samsung Galaxy A51
  • Lighter design: 172g vs 187g
  • Supports Dolby Atmos

Versions

Available versions and configurations
Memory Options - 8/128 GB
- 8/256 GB
- 12/256 GB
- 12/512 GB		 - 4/64 GB
- 4/128 GB
- 6/128 GB
- 8/128 GB
- 8/256 GB

Review

Key Specs Realme 15 5G and Samsung Galaxy A51
Display
Color accuracy, sharpness & brightness
Camera
Main & front camera tests
Performance
App & system performance
Games
3D gaming performance
Battery
Battery life, charging speed & type
Connectivity
Connectivity features
NanoReview Score
Overall score by NanoReview
Adjust each parameter’s importance to find the best match for you.
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Function
Importance (Weight)
Display:
Camera:
Performance:
Gaming:
Battery:
Connectivity:
Higher weight means greater impact on NanoReview score.

Tests & specs

Specs & test comparison
Smartphones:
Realme 15 5G
vs
Samsung Galaxy A51

Display

Display quality comparison
Type OLED Super AMOLED
Size 6.8 in 6.5 in
Resolution 1280x2800 pixels 1080x2400 pixels
Aspect ratio 19.5:9 20:9
Pixel density 453 ppi 405 ppi
Refresh rate 144 Hz 60 Hz
Adaptive refresh rate Yes No
Max brightness 1800 nits 400 nits
HDR support Yes, HDR10+ No
Touch Sampling Rate 240 Hz n/a
Screen-to-body ratio 91.9 % 87.5 %
Features - DCI-P3
- Always-On Display
- DC dimming		 Always-On Display
Display test
Peak brightness (auto)
Realme 15 5G
n/a
Samsung Galaxy A51
631 nits
sRGB gamutn/a98.8 %
PWM (Flicker)n/a242 Hz
Response timen/a25 ms
Contrastn/a∞ Infinite
Sources: NotebookCheck [Samsung Galaxy A51]

Design & Build

Design and ergonomics comparison
Height 162.27 mm (6.39 in) 158.5 mm (6.24 in)
Width 76.16 mm (3 in) 73.6 mm (2.9 in)
Thickness 7.66 mm (0.3 in) 7.9 mm (0.31 in)
Weight 187 g (6.6 oz) 172 g (6.07 oz)
Water resistance IP68 No
Back panel n/a Plastic
Frame Plastic Plastic
Colors - Silver
- Green
- Purple		 - White
- Black
Fingerprint sensor Yes, In-Display Yes In-Display
Screen-to-body ratio
Realme 15 5G
91.9 %
Samsung Galaxy A51
87.5 %

Performance

Testing Realme 15 5G and Samsung Galaxy A51 In benchmarks
Processor
Chipset MediaTek Dimensity 7300 Plus Samsung Exynos 9 Octa 9611
Max Frequency 2600 MHz 2300 MHz
CPU Cores 8 (4 + 4) 8 (4 + 4)
Architecture - 4/2 (Cortex-A55)
- 4/2.5 (Cortex-A78)		 - 4/1.7 (Cortex-A53)
- 4/2.3 (Cortex-A73)
Process TSMC Samsung
Transistor Size 4 nm 10 nm
Neural Processor MediaTek APU 655 Yes
Graphics Mali-G615 MP2 Mali-G72 MP3
GPU Cores 256 54
GPU Frequency 1047 MHz 850 MHz
FLOPS 536.1 GFLOPS 113.8 GFLOPS
GeekBench v6
Geekbench 6 (Single-Core)
Realme 15 5G
1014
Samsung Galaxy A51
512
Geekbench 6 (Multi-Core)
Realme 15 5G
2916
Samsung Galaxy A51
1556
Geekbench 6 (Single-Core)1014512
Geekbench 6 (Multi-Core)29161556
Geekbench Compute (GPU)2497n/a
Sources: Geekbench v6 [Realme 15 5G]
AnTuTu 10
AnTuTu 10
Realme 15 5G
728221
Samsung Galaxy A51
268760
CPU21243783857
GPU14903245166
Memory18508563828
UX18166775909
NanoReview Score728221268760
3DMark Wild Life
3DMark Wild Life
Realme 15 5G
n/a
Samsung Galaxy A51
812
Max Surface Temp.n/a42.2 °C
Stabilityn/a95 %
Graphics Testn/a4 fps
Graphics Scoren/a812
Sources: 3DMark [Samsung Galaxy A51]

Memory

RAM
RAM Size 8 GB - 4 GB
- 6 GB
Memory Type LPDDR4X LPDDR4X
Memory Frequency 2133 MHz 1866 MHz
Channels 2 2
Storage
Storage Capacity128 GB- 64 GB
- 128 GB
Storage TypeUFS 3.1UFS 2.0
Memory CardNoMicroSD

Software

OS Android 15 Android 10 (Upgradeable to Android 13)
OS Size n/a 23 GB
UI Skin Realme UI 6.0 One UI 5.1

Battery

Volume 7000 mAh 4000 mAh
Max Charging Power 80 W 15 W
Battery Type Li-ion Li-Po
Removable No No
Wireless Charging No No
Reverse Charging No No
Fast Charging Yes Yes (40% in 35 min)
Full Charge Time n/a 1:50 h
Battery Life Test
Battery Life
Realme 15 5G
n/a
Samsung Galaxy A51
17:53
Web Browsingn/a07:15 h
Video Playbackn/a11:25 h
Gamesn/a04:49 h
Standby Moden/a81 h

Main camera

Matrix 50 MP 48 MP
Photo resolution 8192x6144 pixels 8000x6000 pixels
Zoom Digital Digital
Flash Dual LED LED
Stabilization Optical Digital
8K Recording No No
4K Recording Yes (Up to 30 fps) Yes (Up to 30 fps)
1080p Recording Yes (Up to 60 fps) Yes (Up to 30 fps)
Slow Motion n/a 960 fps (720p)
Wide-angle lens 112 ° 120 °
Lenses count Standard: 50 MP
Ultra-wide: 8 MP		 Standard: 48 MP
Ultra-wide: 12 MP
Macro: 5 MP
Depth: 5 MP
Features - Bokeh effect
- Pro mode		 - Bokeh effect
- Pro mode
Main lens
Matrix50 MP48 MP
Aperturef/1.8f/2.0
Focal length24 mm26 mm
SensorSony IMX896Sony IMX582
Sensor size1/21/2
Pixel sizen/a0.8 μm
AutofocusPhase autofocusPhase autofocus
StabilizationOpticalDigital
Ultra-wide lens
Matrix8 MP12 MP
Aperturef/2.2f/2.2
Focal length16 mm13 mm
Pixel sizen/a1.12 μm
StabilizationDigitalDigital

Front camera

Matrix 50 MP 32 MP
Photo resolution 8192x6144 pixels 6560x4928 pixels
Aperture n/a f/2.2
Focal length n/a 26 mm
Sensor CMOS Samsung S5KGD1
Sensor size n/a 1/2.8
Pixel size n/a 0.8 μm
Autofocus n/a No
Stabilization Digital Digital
Video resolution 2160p (4K) at 30 fps 2160p (4K) at 30 fps
TOF 3D sensor No No

Connectivity

Wi-Fi version Wi-Fi 6 (802.11 a/b/g/n/ac/ax) Wi-Fi 5 (802.11 a/b/g/n/ac)
Wi-Fi features - Dual Band
- Wi-Fi MiMO
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display		 - Dual Band
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display
Bluetooth version 5.4 5
Bluetooth features LE PBAP/PAB, PAN, OPP, MAP, HSP, HID, HFP, DIP, AVRCP, A2DP
USB type USB Type-C USB Type-C
USB version 2 2
USB features - Charging
- USB Storage Mode
- OTG		 - Charging
- USB Storage Mode
- OTG
DisplayPort No n/a
GPS - GPS
- GLONASS
- Beidou
- Galileo
- QZSS		 - GPS
- GLONASS
- Beidou
- Galileo
NFC* No Yes
Infrared Port Yes No
Connectivity
SIM Count*22
SIM TypeNanoNano
SIM ModeDual SIM StandbyDual SIM Standby
eSIM Support *NoNo
Hybrid SlotNoNo
2G BandsGSM 850/900/1800MHzGSM 850 / 900 / 1800 / 2100 / 2600
3G BandsWCDMA 1/5/8UMTS 850 / 900 / 1900 / 2100
LTE Bands*LTE (B1/B3/B5/B8/B40/B41)LTE (B850/B900/B1800/B2100/B2600)
LTE categoryn/a12
5G SupportYesNo

Sound

Speakers n/a Mono
3.5 mm Jack No Yes
FM Radio No Yes
Dolby Atmos n/a Yes
Speaker Test
Max Volume
Realme 15 5G
n/a
Samsung Galaxy A51
81.7 dB

Other

Class Mid-range Mid-range
Announced July, 2025 yr December, 2019 yr
Release Date July, 2025 yr December, 2019 yr
Launch Price ($) n/a 399
MSRP ($) 280 n/a
Sensors - Proximity Sensor
- Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor		 - Proximity Sensor
- Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor
Charger Included Yes, 80 W n/a
* Attention! Config, frequencies, NFC, and other specs may vary by region.

Results

After analyzing the data, we consider Realme 15 5G the clear winner in this comparison.

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