Samsung Galaxy S21 Ultra (12GB RAM + 128GB) vs Xiaomi Redmi Note 15 Pro Plus (12GB RAM + 512GB)
Here you can compare Samsung Galaxy S21 Ultra (12GB RAM + 1… and Xiaomi Redmi Note 15 Pro Plus (12GB RA…. Comparing Samsung Galaxy S21 Ultra (12GB RAM + 1… vs Xiaomi Redmi Note 15 Pro Plus (12GB RA… on Smartprix enables you to check their respective specs scores and unique features. It would potentially help you understand how Samsung Galaxy S21 Ultra (12GB RAM + 1… stands against Xiaomi Redmi Note 15 Pro Plus (12GB RA… and which one should you buy The current lowest price found for Samsung Galaxy S21 Ultra (12GB RAM + 1… is $280 and for Xiaomi Redmi Note 15 Pro Plus (12GB RA… is $475. The details of both of these products were last updated on Apr 10, 2026.
| Specification | Samsung Galaxy S21 Ultra (12GB RAM + 1… | Xiaomi Redmi Note 15 Pro Plus (12GB RA… |
|---|---|---|
| OS | Android v10 | Android v15 |
| Rear Camera | 108 MP ƒ/1.8 10 MP ƒ/4.9 (Telephoto) 10 MP ƒ/2.4 (Telephoto) 12 MP ƒ/2.2 (Ultra Wide) | 200 MP ƒ/1.7 (Wide Angle) 23mm (wide), 1/1.4", 0.56µm, multi-directional PDAF, OIS 8 MP ƒ/2.2 (Ultra Wide) 15mm, 120˚ (ultrawide), 1/4.0", 1.12µm |
| Display | 6.8 inches, 1440 x 3200 pixels, 120 Hz | 6.83 inches, 1280 x 2772 pixels, 120 Hz |
| Internal Memory | 128 GB | 512 GB |
| Battery | 5000 mAh, Li-Po Battery | 6500 mAh, Li-Po Battery |
| Price | $280 | $475 |
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Overview
| Specs Score | 53 / 100 | 93 / 100 Better Specs |
| Display Resolution | 1440 x 3200 pixels Better Resolution | 1280 x 2772 pixels |
| Storage | 128 GB | 512 GB More Storage |
| CPU Clock Speed | 2.9 GHz Faster Clock Speed | 2.7 GHz |
| Rear Camera | 108 MP Quad | 200 MP + 8 MP Dual Better Camera Resolution |
| Front Camera | 40 MP Better Front Camera Resolution | 32 MP |
| Weight | 227 g | 207 g Lighter |
| Thickness | 8.9 mm | 8.2 mm Slimmer |
| Battery | 5000 mAh | 6500 mAh Bigger Battery |
| Unique Features | Wireless Charging No | No IR Blaster |
General
| Model | Galaxy S21 Ultra 5G | 2510ERA8BG |
| Sim Type | Dual Sim, GSM+GSM | Dual Sim, GSM+GSM |
| Dual Sim | Yes | Yes |
| Sim Size | Nano+Nano SIM | Nano-SIM + eSIM, Nano-SIM + Nano-SIM |
| Device Type | Smartphone | Smartphone |
| Release Date | January 14, 2021 | December 18, 2025 |
Design
| Dimensions | 75.6 x 165.1 x 8.9 mm | 78.3 x 163.3 x 8.2 mm |
| Weight | 227 g | 207 g |
| Colors | Glacier Blue, Mocha Brown, Black |
Display
| Type | Color Dynamic AMOLED 2X (16M Colors) | Color AMOLED Screen (1B Colors) |
| Touch | Yes | Yes |
| Size | 6.8 inches, 1440 x 3200 pixels, 120 Hz | 6.83 inches, 1280 x 2772 pixels, 120 Hz |
| Aspect Ratio | 20:9 | 20.1:9 |
| PPI | ~ 515 PPI | ~ 447 PPI |
| Screen to Body Ratio | ~ 89.8% | ~ 89.6% |
| Glass Type | Corning Gorilla Glass Victus | Corning Gorilla Glass Victus 2 |
| Brightness | 3200 nits (peak) | |
| Features | Always-on Display, HDR10+, Curved Display | 3840Hz PWM, HDR10+, Dolby Vision |
| Notch | Yes, Punch Hole | Yes, Punch Hole |
Memory
| RAM | 12 GB | 12 GB |
| Storage | 128 GB | 512 GB |
| Storage Type | UFS 3.1 | UFS 2.2 |
| Card Slot | No |
Connectivity
| GPRS | Yes | Yes |
| EDGE | Yes | Yes |
| 3G | Yes | Yes |
| 4G | Yes | Yes |
| 5G | Yes | Yes |
| VoLTE | Yes, Dual Stand-By | Yes, Dual Stand-By |
| Wifi | Yes, with wifi-hotspot | Yes, with wifi-hotspot |
| Bluetooth | Yes, v5.2, A2DP, LE | Yes, v5.4, A2DP, LE |
| USB | Yes, USB-C v3.2 | Yes, USB-C v2.0 |
| USB Features | USB on-the-go, USB Charging | USB on-the-go, USB Charging |
| IR Blaster | Yes |
Extra
| GPS | Yes, with A-GPS, GLONASS, BDS, GALILEO | Yes, with A-GPS, Galileo, GLONASS, Beidou, NavIC Support |
| Fingerprint Sensor | Yes, In Display | Yes, In Display |
| Face Unlock | Yes | Yes |
| Sensors | Accelerometer, Gyro, Proximity, Compass, Barometer | Accelerometer, Gyro, Compass, Proximity |
| 3.5mm Headphone Jack | No | No |
| NFC | Yes | Yes |
| Water Resistance | Yes, 1.5 m upto 30 min | Yes, 1.5 m upto 30 min |
| IP Rating | IP68 | IP68 |
| Dust Resistant | Yes | Yes |
Camera
| Rear Camera | 108 MP ƒ/1.8 10 MP ƒ/4.9 (Telephoto) 10 MP ƒ/2.4 (Telephoto) 12 MP ƒ/2.2 (Ultra Wide) | 200 MP ƒ/1.7 (Wide Angle) 23mm (wide), 1/1.4", 0.56µm, multi-directional PDAF, OIS 8 MP ƒ/2.2 (Ultra Wide) 15mm, 120˚ (ultrawide), 1/4.0", 1.12µm |
| OIS | Yes | Yes |
| Auto Focus | Yes | Yes |
| Features | Auto-HDR, Panorama | |
| Video Recording | 8K @ 24 fps UHD, 4K @ 30/60 fps UHD, 1080p @ 240/30/60 fps FHD, 720p @ 960 fps HD | 4K, 1080p |
| Flash | Yes, LED | Yes, LED |
| Front Camera | 40 MP ƒ/2.2 (Wide Angle) Punch Hole, Autofocus | 32 MP ƒ/2.2 (Wide Angle) Punch Hole |
| Front Video Recording | 4K @ 30/60 fps UHD, 1080p @ 30 fps FHD | 1080p @ 30 fps FHD |
Technical
| OS | Android v10 | Android v15 |
| Custom UI | Hyper OS 2 | |
| Chipset | Samsung Exynos 2100 | Qualcomm Snapdragon 7s Gen4 |
| CPU | 2.9 GHz, Octa Core Processor | 2.7 GHz, Octa Core Processor |
| Core Details | 1x2.9 GHz Cortex-X1 & 3x2.80 GHz Cortex-A78 & 4x2.2 GHz Cortex-A55 | 1x2.7 GHz Cortex-A720 & 3x2.4 GHz Cortex-A720 & 4x1.8 GHz Cortex-A520 |
| GPU | Mali-G78 MP14 | Adreno 810 |
| Java | No | No |
| Browser | Yes | Yes, supports HTML5 |
Multimedia
| Yes | Yes | |
| Music | Yes | MP3, AMR, FLAC, APE |
| Video | Yes | MP4, M4V, MKV, XVID |
| FM Radio | No | No |
| Document Reader | Yes | Yes |
Battery
| Type | Non-Removable Battery | Non-Removable Battery |
| Size | 5000 mAh, Li-Po Battery | 6500 mAh, Li-Po Battery |
| Fast Charging | Yes, 25W Fast Charging | Yes, 100W Fast Charging |
| Wireless Charging | Yes, 15W | |
| Reverse Charging | Yes, 4.5W | Yes, 22.5W |
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