Samsung Galaxy S21 vs Realme 15 5G (Global)

65 out 100

VS

72 out 100

Compared 2 smartphones : Samsung Galaxy S21 Manufactured in February, 2021, with display 6.2 with chipsetSamsung Exynos 2100, vs Realme 15 5G (Global), Manufactured in November, 2025 with chipsetMediaTek Dimensity 7300 Plus. Below are specs, tests, pros and cons for each device

Key Differences

Device key advantages

Reasons to choose Samsung Galaxy S21

Higher pixel density: 421ppi
Lighter design: 169g vs 185g
Supports newer USB: 3.2 vs 2
Supports Dolby Atmos
Built-in eSIM

Reasons to choose Realme 15 5G (Global)

Larger display: 6.77in
Higher refresh rate: 144Hz
Higher battery capacity: 7000mAh vs 4000mAh
Newer Bluetooth version: 5.4 vs 5
Infrared port
Includes charger

Versions

Available versions and configurations

Memory Options

- 8/128 GB
- 8/256 GB

n/a

Review

Key Specs Samsung Galaxy S21 and Realme 15 5G (Global)

Display

Color accuracy, sharpness & brightness

Samsung Galaxy S21

75

Realme 15 5G (Global)

88

Camera

Main & front camera tests

Samsung Galaxy S21

75

Realme 15 5G (Global)

72

Performance

App & system performance

Samsung Galaxy S21

53

Realme 15 5G (Global)

47

Games

3D gaming performance

Samsung Galaxy S21

44

Realme 15 5G (Global)

29

Battery

Battery life, charging speed & type

Samsung Galaxy S21

56

Realme 15 5G (Global)

100

Connectivity

Connectivity features

Samsung Galaxy S21

86

Realme 15 5G (Global)

74

NanoReview Score

Overall score by NanoReview

Samsung Galaxy S21

65

Realme 15 5G (Global)

72

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.

Display

Display quality comparison

Type	Dynamic AMOLED	AMOLED
Size	6.2 in	6.77 in
Resolution	1080x2400 pixels	1080x2392 pixels
Aspect ratio	20:9	19.5:9
Pixel density	421 ppi	388 ppi
Refresh rate	120 Hz	144 Hz
Adaptive refresh rate	Yes (48-120 Hz)	Yes
Max brightness	800 nits	1600 nits
HDR support	Yes HDR10+	Yes, HDR10+
Touch Sampling Rate	n/a	240 Hz
Screen-to-body ratio	85.9 %	90.8 %
Features	- DCI-P3 - Always-On Display	- DCI-P3 - Always-On Display - DC dimming

Peak brightness (auto)

Samsung Galaxy S21

854 nits

Realme 15 5G (Global)

n/a

sRGB gamut	99.5 %	n/a
PWM (Flicker)	240 Hz	n/a
Response time	5 ms	n/a
Contrast	∞ Infinite	n/a

Sources: NotebookCheck [Samsung Galaxy S21]

Design & Build

Design and ergonomics comparison

Height	151.7 mm (5.97 in)	163.34 mm (6.43 in)
Width	71.2 mm (2.8 in)	75.88 mm (2.99 in)
Thickness	7.9 mm (0.31 in)	7.66 mm (0.3 in)
Weight	169 g (5.96 oz)	185 g (6.53 oz)
Water resistance	IP68	IP69
Back panel	Plastic	n/a
Frame	Metal	Plastic
Colors	- White - Gray - Pink - Purple	- Gray - Pink - Purple
Fingerprint sensor	Yes In-Display	Yes, In-Display

Screen-to-body ratio

Samsung Galaxy S21

85.9 %

Realme 15 5G (Global)

90.8 %

Performance

Testing Samsung Galaxy S21 and Realme 15 5G (Global) In benchmarks

Chipset	Samsung Exynos 2100	MediaTek Dimensity 7300 Plus
Max Frequency	2900 MHz	2600 MHz
CPU Cores	8 (1 + 3 + 4)	8 (4 + 4)
Architecture	- 4/2.2 (Cortex-A55) - 3/2.81 (Cortex-A78) - 1/2.91 (Cortex-X1)	- 4/2 (Cortex-A55) - 4/2.5 (Cortex-A78)
Process	Samsung	TSMC
Transistor Size	5 nm	4 nm
Neural Processor	Yes	MediaTek APU 655
Graphics	Mali-G78 MP14	Mali-G615 MP2
GPU Cores	896	256
GPU Frequency	854 MHz	1047 MHz
FLOPS	1530.4 GFLOPS	536.1 GFLOPS

Geekbench 6 (Single-Core)

Samsung Galaxy S21

1331

Realme 15 5G (Global)

1012

Geekbench 6 (Multi-Core)

Samsung Galaxy S21

3593

Realme 15 5G (Global)

2976

Geekbench 6 (Single-Core)	1331	1012
Geekbench 6 (Multi-Core)	3593	2976

AnTuTu 10

Samsung Galaxy S21

903780

Realme 15 5G (Global)

730248

CPU	253391	218026
GPU	281676	151416
Memory	158352	187569
UX	210361	173237
NanoReview Score	903780	730248

3DMark Wild Life

Samsung Galaxy S21

5715

Realme 15 5G (Global)

n/a

Max Surface Temp.	38.9 °C	n/a
Stability	66 %	n/a
Graphics Test	34 fps	n/a
Graphics Score	5715	n/a

Sources: 3DMark [Samsung Galaxy S21]

PCMark 3.0

Samsung Galaxy S21

13123

Realme 15 5G (Global)

n/a

Writing score	16101	n/a
Web score	11909	n/a
Video editing	7097	n/a
Data manipulation	10153	n/a
NanoReview Score	13123	n/a

Memory

RAM Size	8 GB	12 GB
Memory Type	LPDDR5	LPDDR4X
Memory Frequency	2750 MHz	2133 MHz
Channels	2	2

Storage Capacity	- 128 GB - 256 GB	256 GB
Storage Type	UFS 3.1	UFS 3.1
Memory Card	No	No

Software

OS	Android 11 (Upgradeable to Android 14)	Android 15
OS Size	28.1 GB	n/a
UI Skin	One UI 6.0	Realme UI 6.0

Battery

Volume	4000 mAh	7000 mAh
Max Charging Power	25 W	80 W
Battery Type	Li-ion	Silicon Carbon (Si/C)
Removable	No	No
Wireless Charging	Yes (15 W)	No
Reverse Charging	Yes (Wireless)	No
Fast Charging	Yes (55% in 50 min)	Yes (50% in 26 min)
Full Charge Time	1:35 h	0:62 h

Battery Life

Samsung Galaxy S21

17:54

Realme 15 5G (Global)

n/a

Web Browsing	06:01 h	n/a
Video Playback	11:06 h	n/a
Games	04:21 h	n/a
Standby Mode	95 h	n/a

Main camera

Matrix	12 MP	50 MP
Photo resolution	4000x3000 pixels	8192x6144 pixels
Zoom	Optical, 1.1x	Digital
Flash	Dual LED	Dual LED
Stabilization	Optical	Optical
8K Recording	Up to 24FPS	No
4K Recording	Yes (Up to 60 fps)	Yes (Up to 30 fps)
1080p Recording	Yes (Up to 60 fps)	Yes (Up to 60 fps)
Slow Motion	960 fps (720p)	240 fps (720p)
Wide-angle lens	120 °	112 °
Lenses count	Standard: 12 MP Telephoto: 64 MP Ultra-wide: 12 MP	Standard: 50 MP Ultra-wide: 8 MP
Features	- Bokeh effect - Pro mode - RAW support	- Bokeh effect - Pro mode

Matrix	12 MP	50 MP
Aperture	f/1.8	f/1.8
Focal length	26 mm	26 mm
Sensor	Sony IMX555	Sony IMX882
Sensor size	1/1.76	1/1.95 (0.51)
Pixel size	1.8 μm	n/a
Autofocus	Phase autofocus (Dual Pixel)	Phase autofocus
Stabilization	Optical	Optical

Matrix	64 MP	n/a
Aperture	f/2.0	n/a
Focal length	28 mm	n/a
Sensor	Samsung Bright S5KGW2	n/a
Sensor size	1/1.72	n/a
Pixel size	0.8 μm	n/a
Stabilization	Optical	n/a

Matrix	12 MP	8 MP
Aperture	f/2.2	f/2.2
Focal length	13 mm	16 mm
Sensor	Sony IMX563	n/a
Sensor size	1/2.55	n/a
Pixel size	1.4 μm	n/a
Stabilization	Digital	Digital

Photo quality

Samsung Galaxy S21

129

Realme 15 5G (Global)

n/a

Video quality

Samsung Galaxy S21

137

Realme 15 5G (Global)

n/a

Overall camera score

Samsung Galaxy S21

133

Realme 15 5G (Global)

n/a

Bokeh	70	n/a
Preview	72	n/a
Zoom	126	n/a

Sources: DxOMark [Samsung Galaxy S21]

Front camera

Matrix	10 MP	50 MP
Photo resolution	3872x2592 pixels	8192x6144 pixels
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	n/a
Autofocus	Phase autofocus (Dual Pixel)	No
Stabilization	Digital	Digital
Video resolution	2160p (4K) at 60 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 6 (802.11 a/b/g/n/ac/ax)
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	5.4
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	No
GPS	- GPS - GLONASS - Beidou - Galileo	- GPS - GLONASS - Beidou - Galileo - QZSS
NFC*	Yes	No
Infrared Port	No	Yes

SIM Count*	2	2
SIM Type	Nano	Nano
SIM Mode	Dual SIM Standby	Dual SIM Standby
eSIM Support *	Yes	No
Hybrid Slot	No	No
2G Bands	GSM 850, 900, 1800, 1900 MHz	GSM 900/1800MHz
3G Bands	WCDMA Band 1, 2, 4, 5, 8	WCDMA 900/2100MHz
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/B3/B5/B8/B40)
LTE category	24	n/a
5G Support	Yes	Yes

Sound

Speakers	Stereo	n/a
3.5 mm Jack	No	No
FM Radio	No	No
Dolby Atmos	Yes	No

Max Volume

Samsung Galaxy S21

87 dB

Realme 15 5G (Global)

n/a

Other

Class	Flagship	Mid-range
Announced	January, 2021 yr	September, 2025 yr
Release Date	February, 2021 yr	November, 2025 yr
Launch Price ($)	800	n/a
MSRP ($)	n/a	350
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, 80 W

Results

No clear favorite identified yet; updates may follow as new data arrives.

Survey

Which smartphone would you pick?

Samsung Galaxy S21

0 (0%)

Realme 15 5G (Global)

0 (0%)

Total Votes: 0

Samsung Galaxy S21 vs Realme 15 5G (Global)

Key Differences

Versions

Review

Tests & specs

Display

Design & Build

Performance

Memory

Software

Battery

Main camera

Front camera

Connectivity

Sound

Other

Results

Survey

User comments