Home Phone comparison Samsung Galaxy S21 and OnePlus 15T - Which is better?

Samsung Galaxy S21 vs OnePlus 15T

65 out 100
Samsung Galaxy S21
VS
92 out 100
OnePlus 15T
Samsung Galaxy S21
OnePlus 15T

Compared 2 smartphones : Samsung Galaxy S21 Manufactured in February, 2021, with display 6.2 with chipsetSamsung Exynos 2100, vs OnePlus 15T, Manufactured in March, 2026 with chipsetQualcomm Snapdragon 8 Elite Gen 5. 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 Samsung Galaxy S21
  • Lighter design: 169g vs 194g
  • Supports newer USB: 3.2 vs 2
  • Supports Dolby Atmos
Reasons to choose OnePlus 15T
  • Larger display: 6.32in
  • Higher pixel density: 460ppi
  • Higher refresh rate: 165Hz
  • Higher battery capacity: 7500mAh vs 4000mAh
  • Newer Bluetooth version: 6.0 vs 5
  • Supports DisplayPort
  • Infrared port
  • Includes charger

Versions

Available versions and configurations
Memory Options - 8/128 GB
- 8/256 GB		 - 12/256 GB
- 12/512 GB
- 16/256 GB
- 16/512 GB
- 16/1024 GB

Review

Key Specs Samsung Galaxy S21 and OnePlus 15T
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.
Customize your score
Function
Importance (Weight)
Display:
Camera:
Performance:
Gaming:
Battery:
Connectivity:
Higher weight means greater impact on NanoReview score.

Tests & specs

Specs & test comparison
Smartphones:
Samsung Galaxy S21
vs
OnePlus 15T

Display

Display quality comparison
Type Dynamic AMOLED AMOLED
Size 6.2 in 6.32 in
Resolution 1080x2400 pixels 1216x2640 pixels
Aspect ratio 20:9 19.5:9
Pixel density 421 ppi 460 ppi
Refresh rate 120 Hz 165 Hz
Adaptive refresh rate Yes (48-120 Hz) Yes (60-165 Hz)
Max brightness 800 nits 1800 nits
HDR support Yes HDR10+ Yes, Dolby Vision
Touch Sampling Rate n/a 330 Hz
Screen-to-body ratio 85.9 % 90.7 %
Features - DCI-P3
- Always-On Display		 - DCI-P3
- Always-On Display
- DC dimming
Display test
Peak brightness (auto)
Samsung Galaxy S21
854 nits
OnePlus 15T
1103 nits
sRGB gamut99.5 %99.9 %
PWM (Flicker)240 Hz120 Hz
Response time5 ms6 ms
Contrast∞ Infinite∞ Infinite
Sources: NotebookCheck [Samsung Galaxy S21], [OnePlus 15T]

Design & Build

Design and ergonomics comparison
Height 151.7 mm (5.97 in) 150.56 mm (5.93 in)
Width 71.2 mm (2.8 in) 71.82 mm (2.83 in)
Thickness 7.9 mm (0.31 in) 8.35 mm (0.33 in)
Weight 169 g (5.96 oz) 194 g (6.84 oz)
Water resistance IP68 IP69
Cooling system n/a Vapor chamber
Back panel Plastic Plastic
Frame Metal Metal
Colors - White
- Gray
- Pink
- Purple		 - White
- Green
- Brown
Fingerprint sensor Yes In-Display Yes, In-Display
Screen-to-body ratio
Samsung Galaxy S21
85.9 %
OnePlus 15T
90.7 %

Performance

Testing Samsung Galaxy S21 and OnePlus 15T In benchmarks
Processor
Chipset Samsung Exynos 2100 Qualcomm Snapdragon 8 Elite Gen 5
Max Frequency 2900 MHz 4608 MHz
CPU Cores 8 (1 + 3 + 4) 8 (2 + 6)
Architecture - 4/2.2 (Cortex-A55)
- 3/2.81 (Cortex-A78)
- 1/2.91 (Cortex-X1)		 - 6/3.63 (Oryon Gen 3 Performance)
- 2/4.61 (Oryon Gen 3 Prime)
Process Samsung TSMC
Transistor Size 5 nm 3 nm
Neural Processor Yes Hexagon
Graphics Mali-G78 MP14 n/a
GPU Cores 896 n/a
GPU Frequency 854 MHz n/a
FLOPS 1530.4 GFLOPS n/a
GeekBench v6
Geekbench 6 (Single-Core)
Samsung Galaxy S21
1331
OnePlus 15T
3640
Geekbench 6 (Multi-Core)
Samsung Galaxy S21
3593
OnePlus 15T
11033
Geekbench 6 (Single-Core)13313640
Geekbench 6 (Multi-Core)359311033
Sources: Geekbench v6 [OnePlus 15T]
AnTuTu 10
AnTuTu 10
Samsung Galaxy S21
903780
OnePlus 15T
3676955
CPU2533911052960
GPU2816761369637
Memory158352479431
UX210361774927
NanoReview Score9037803676955
3DMark Wild Life
3DMark Wild Life
Samsung Galaxy S21
5715
OnePlus 15T
n/a
Max Surface Temp.38.9 °Cn/a
Stability66 %n/a
Graphics Test34 fpsn/a
Graphics Score5715n/a
Sources: 3DMark [Samsung Galaxy S21]
PCMark 3.0
PCMark 3.0
Samsung Galaxy S21
13123
OnePlus 15T
n/a
Writing score16101n/a
Web score11909n/a
Video editing7097n/a
Data manipulation10153n/a
NanoReview Score13123n/a

Memory

RAM
RAM Size 8 GB 12 GB
Memory Type LPDDR5 LPDDR5X
Memory Frequency 2750 MHz 5300 MHz
Channels 2 4
Storage
Storage Capacity- 128 GB
- 256 GB		256 GB
Storage TypeUFS 3.1UFS 4.1
Memory CardNoNo

Software

OS Android 11 (Upgradeable to Android 14) Android 16
OS Size 28.1 GB 57 GB
UI Skin One UI 6.0 ColorOS 16

Battery

Volume 4000 mAh 7500 mAh
Max Charging Power 25 W 100 W
Battery Type Li-ion Silicon Carbon (Si/C)
Removable No No
Wireless Charging Yes (15 W) Yes (50 W)
Reverse Charging Yes (Wireless) Yes
Fast Charging Yes (55% in 50 min) Yes (61% in 30 min)
Full Charge Time 1:35 h 0:46 h
Battery Life Test
Battery Life
Samsung Galaxy S21
17:54
OnePlus 15T
n/a
Web Browsing06:01 hn/a
Video Playback11:06 hn/a
Games04:21 hn/a
Standby Mode95 hn/a

Main camera

Matrix 12 MP 50 MP
Photo resolution 4000x3000 pixels 8192x6144 pixels
Zoom Optical, 1.1x Optical, 3.5x
Flash Dual LED Dual LED
Stabilization Optical Optical
8K Recording Up to 24FPS Yes (Up to 30 fps)
4K Recording Yes (Up to 60 fps) Yes (Up to 120 fps)
1080p Recording Yes (Up to 60 fps) Yes (Up to 120 fps)
Slow Motion 960 fps (720p) 480 fps (720p)
Wide-angle lens 120 ° n/a
Lenses count Standard: 12 MP
Telephoto: 64 MP
Ultra-wide: 12 MP		 Standard: 50 MP
Telephoto: 50 MP
Features - Bokeh effect
- Pro mode
- RAW support		 - Bokeh effect
- Pro mode
- RAW support
Main lens
Matrix12 MP50 MP
Aperturef/1.8f/1.8
Focal length26 mm24 mm
SensorSony IMX555Sony IMX906
Sensor size1/1.761/1.56 (0.64)
Pixel size1.8 μm1 μm
AutofocusPhase autofocus (Dual Pixel)Phase autofocus
StabilizationOpticalOptical
Telephoto
Matrix64 MP50 MP
Aperturef/2.0f/2.8
Focal length28 mm85 mm
SensorSamsung Bright S5KGW2Samsung S5KJN5
Sensor size1/1.721/2.76 (0.36)
Pixel size0.8 μm0.64 μm
StabilizationOpticalOptical
Ultra-wide lens
Matrix12 MPn/a
Aperturef/2.2n/a
Focal length13 mmn/a
SensorSony IMX563n/a
Sensor size1/2.55n/a
Pixel size1.4 μmn/a
StabilizationDigitaln/a
Main camera DxOMark results
Photo quality
Samsung Galaxy S21
129
OnePlus 15T
n/a
Video quality
Samsung Galaxy S21
137
OnePlus 15T
n/a
Overall camera score
Samsung Galaxy S21
133
OnePlus 15T
n/a
Bokeh70n/a
Preview72n/a
Zoom126n/a
Sources: DxOMark [Samsung Galaxy S21]

Front camera

Matrix 10 MP 16 MP
Photo resolution 3872x2592 pixels n/a
Aperture f/2.2 f/2.4
Focal length 26 mm 23 mm
Sensor Sony IMX374 CMOS
Sensor size 1/3.24 n/a
Pixel size 1.22 μm 1 μm
Autofocus Phase autofocus (Dual Pixel) No
Stabilization Digital Digital
Video resolution 2160p (4K) at 60 fps 1080p (Full HD) 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 7 (802.11 a/b/g/n/ac/ax/be)
Wi-Fi features - Dual Band
- Wi-Fi MiMO
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display		 - Dual Band
- Wi-Fi MiMO
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display
Bluetooth version 5 6.0
Bluetooth features LE, A2DP LE
USB type USB Type-C USB Type-C
USB version 3.2 2
USB features - Charging
- USB Storage Mode
- USB-Host mode
- OTG		 - Charging
- USB Storage Mode
- OTG
DisplayPort n/a Yes
GPS - GPS
- GLONASS
- Beidou
- Galileo		 - GPS
- GLONASS
- Beidou
- Galileo
- QZSS
NFC* Yes Yes
Infrared Port No Yes
Connectivity
SIM Count*22
SIM TypeNanoNano
SIM ModeDual SIM StandbyDual SIM Standby
eSIM Support *YesYes
Hybrid SlotNoNo
2G BandsGSM 850, 900, 1800, 1900 MHzGSM 850/900/1800MHz
3G BandsWCDMA Band 1, 2, 4, 5, 8WCDMA 1/2/4/5/8
LTE Bands*LTE (B1/B2/B3/B4/B5/B7/B8/B12/B13/B17/B18/B19/B20/B25/B26/B28/B32/B38/B39/B40/B41/B66)LTE (B1/B2/B3/B4/B5/B7/B8/B18/B19/B26/B28/B34/B38/B39/B40/B41/B42/B43/B48/B66)
LTE category24n/a
5G SupportYesYes

Sound

Speakers Stereo n/a
3.5 mm Jack No No
FM Radio No No
Dolby Atmos Yes No
Speaker Test
Max Volume
Samsung Galaxy S21
87 dB
OnePlus 15T
81.5 dB

Other

Class Flagship Flagship
Announced January, 2021 yr March, 2026 yr
Release Date February, 2021 yr March, 2026 yr
Launch Price ($) 800 n/a
MSRP ($) n/a 799
Sensors - Hall Sensor
- Barometer
- Proximity Sensor
- Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor		 - Proximity Sensor
- Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor
Charger Included n/a Yes, 100 W
* Attention! Config, frequencies, NFC, and other specs may vary by region.

Results

After analyzing the data, we consider OnePlus 15T the clear winner in this comparison.

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