Samsung Galaxy S25 Ultra (12GB RAM + 512GB) vs Samsung Galaxy S21 Ultra 5G (16GB RAM + 512GB)
Quick Comparison
Samsung Galaxy S21 Ultra 5G (16GB RAM + 512GB) has better RAM than Samsung Galaxy S25 Ultra (12GB RAM + 512GB). In terms of display resolution, Samsung Galaxy S21 Ultra 5G (16GB RAM + 512GB) has better resolution of 3200 x 1440 than Samsung Galaxy S25 Ultra (12GB RAM + 512GB) which has resolution of 3120 x 1440. Both have the same amount of internal memory.
| Name | Samsung Galaxy S25 Ultra (12GB RAM + 512GB) | Samsung Galaxy S21 Ultra 5G (16GB RAM + 512GB) |
| RAM | 12 GB | 16 GB |
|---|---|---|
| Display | 6.9 in | 6.8 in |
| Internal Memory | 512 GB | 512 GB |
| Battery | 5000 mAh | 5000 mAh |
| Camera | 200 MP Quad | 108 MP Quad |
| Price | Rs. 141999 | Rs. 111999 |
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Detailed Comparison
Price And Launch
The launch Date of the first phone is January 22, 2025. The cost of Samsung Galaxy S25 Ultra (12GB RAM + 512GB) is Rs. 141999. The launch Date of the second phone is January 14, 2021. The cost of Samsung Galaxy S21 Ultra 5G (16GB RAM + 512GB) is Rs. 111999.
Display comparison
Samsung Galaxy S21 Ultra 5G (16GB RAM + 512GB) has screen size of 6.8 inches which falls short to Samsung Galaxy S25 Ultra (12GB RAM + 512GB)'s 6.9 inch screen. Samsung Galaxy S25 Ultra (12GB RAM + 512GB) has LTPO AMOLED Screen type where as Samsung Galaxy S21 Ultra 5G (16GB RAM + 512GB) has Screen type. Samsung Galaxy S21 Ultra 5G (16GB RAM + 512GB) has display density of 515 PPI & Samsung Galaxy S25 Ultra (12GB RAM + 512GB) has only 498 PPI display density. In terms of screen to body ratio, Samsung Galaxy S25 Ultra (12GB RAM + 512GB) has better screen to body ratio of ~ 92.5% than Samsung Galaxy S21 Ultra 5G (16GB RAM + 512GB)'s ~ 89.8%. Samsung Galaxy S25 Ultra (12GB RAM + 512GB) has 19.5:9 aspect ratio where as Samsung Galaxy S21 Ultra 5G (16GB RAM + 512GB) has 20:9 aspect ratio.
Memory comparison
Samsung Galaxy S21 Ultra 5G (16GB RAM + 512GB)'s larger 16 GB RAM is better for playing games and all with respect to Samsung Galaxy S25 Ultra (12GB RAM + 512GB)'s lower 12 GB RAM. and both have same Internal Memory of 512 GB.
Camera comparison
Samsung Galaxy S25 Ultra (12GB RAM + 512GB)'s 200 MP Quad Rear Camera outshines Samsung Galaxy S21 Ultra 5G (16GB RAM + 512GB)'s 108 MP Quad Rear Camera in terms of resolution. Samsung Galaxy S21 Ultra 5G (16GB RAM + 512GB) will be better choice if you're looking to click lot of selfies as it has better 40 MP Front Camera in comparison to Samsung Galaxy S25 Ultra (12GB RAM + 512GB)'s 12 MP Front Camera.
Technical comparison
Both the phones has Android Operating System but the first one runs on version 15 and the second one on 10 version.
Related Comparisons
Full Comparison
| Name | Samsung Galaxy S25 Ultra (12GB RAM + 512GB) | Samsung Galaxy S21 Ultra 5G (16GB RAM + 512GB) |
| General | ||
| Model | SM-S938B, SM-S938B/DS, SM-S938U, SM-S938U1, SM-S938W, SM-S938N, SM-S9380, SM-S938E, SM-S938E/DS | Galaxy S21 Ultra 5G |
| Sim Type | Dual Sim, GSM+GSM | Dual Sim, GSM+GSM |
| Dual Sim | Yes | Yes |
| Sim Size | eSIM+Nano SIM | Nano+Nano SIM |
| SAR | 1.26 W/kg (Head) 0.64 W/kg (Body) | |
| Device Type | Smartphone | Smartphone |
| Release Date | January 22, 2025 | January 14, 2021 |
| In The Box | Handset, Stylus Pen, Data Cable (Type C to C), Sim Ejection Pin | |
| Design | ||
| Dimensions | 77.6 x 162.8 x 8.2 mm | 75.6 x 165.1 x 8.9 mm |
| Weight | 218 g | 227 g |
| Bezel less | No | |
| Qwerty | No | |
| Colors | Titanium Silverblue, Titanium Black, Titanium Whitesilver, Titanium Gray | |
| Display | ||
| Type | Color LTPO AMOLED Screen (1B Colors) | Color Dynamic AMOLED 2X (16M Colors) |
| Touch | Yes | Yes |
| Size | 6.9 inches, 1440 x 3120 pixels, 120 Hz | 6.8 inches, 1440 x 3200 pixels, 120 Hz |
| Aspect Ratio | 19.5:9 | 20:9 |
| PPI | ~ 498 PPI | ~ 515 PPI |
| Screen to Body Ratio | ~ 92.5% | ~ 89.8% |
| Glass Type | Corning Gorilla Armor 2 | Corning Gorilla Glass Victus |
| Features | HDR10+, 2600 nits (Peak), Always-on Display | Always-on Display, HDR10+ |
| Notch | Yes, Punch Hole | Yes, Punch Hole |
| Curved Display | No | |
| Memory | ||
| RAM | 12 GB | 16 GB |
| Storage | 512 GB | 512 GB |
| Storage Type | UFS 4 | UFS 3.1 |
| Card Slot | No | |
| Connectivity | ||
| GPRS | Yes | Yes |
| EDGE | Yes | Yes |
| 3G | Yes | Yes |
| 4G | Yes | Yes |
| 5G | Yes | Yes |
| 5G Bands | TDD Sub6: N38(2600), N40(2300), N41(2500), N77(3700), N78(3500), FDD Sub6: N1(2100), N2(1900), N3(1800), N5(850), N7(2600), N8(900), N12(700), N20(800), N25(1900), N26(850), N28(700), N66(AWS-3) | |
| VoLTE | Yes, Dual Stand-By | Yes, Dual Stand-By |
| Vo5G | Yes | |
| Wifi | Yes, with wifi-hotspot | Yes, with wifi-hotspot |
| Wifi Version | Wi-Fi 7, 802.11a/b/g/n/ac/ax/be 2.4GHz+5GHz+6GHz, EHT320, MIMO, 4096-QAM | |
| Bluetooth | Yes, v5.4, A2DP, LE | Yes, v5.2, A2DP, LE |
| USB | Yes, USB-C v3.2 | Yes, USB-C v3.2 |
| USB Features | USB Tethering, USB on-the-go, USB Charging, USB Storage | USB on-the-go, USB Charging |
| Performance | ||
| AnTuTu Score | 2,216,272 (Total) (v10) 562,773 (CPU) 880,816 (GPU) 427,168 (Memory) 345,515 (UX) | |
| Extra | ||
| GPS | Yes with A-GPS, Glonass, Beidou, Galileo, QZSS | Yes, with A-GPS, GLONASS, BDS, GALILEO |
| Fingerprint Sensor | Yes, In Display | Yes, In Display |
| Face Unlock | Yes | Yes |
| Sensors | Accelerometer, Barometer, Gyro Sensor, Geomagnetic Sensor, Hall Sensor, Light Sensor, Proximity Sensor | Accelerometer, Gyro, Proximity, Compass, Barometer |
| 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 |
| Extra Features | Photo Assist, Notes Assist, Drawing Assist, Circle to Search, Google Gemini (AI Mobile), 7 Years of Major OS Updates and 7 Years of Security Updates, Titanium Frame, Samsung Care+, Samsung Health, Samsung Wallet, S Pen Included, Glass Front (Corning Gorilla Armor 2), Glass Back (Corning Gorilla Armor 2), Titanium Frame (Grade 5), Stereo Speakers, DisplayPort 1.2, Samsung DeX, Samsung Wireless DeX, Ultra Wideband (UWB) Support | |
| Camera | ||
| Rear Camera | 200 MP ƒ/1.7 (Wide Angle) 24mm (wide), 1/1.3", 0.6µm, Multi-directional PDAF, OIS 10 MP ƒ/2.4 (Telephoto) 67mm (telephoto), 1/3.52", 1.12µm, PDAF, OIS, 3x Optical Zoom 50 MP ƒ/3.4 (Telephoto) 111mm (Periscope Telephoto), 1/2.52", 0.7µm, PDAF, OIS, 5x Optical Zoom 50 MP ƒ/1.9 (Ultra Wide) 120˚ (Ultrawide), 0.7µm, Dual Pixel PDAF, Super Steady Video | 108 MP ƒ/1.8 10 MP ƒ/4.9 (Telephoto) 10 MP ƒ/2.4 (Telephoto) 12 MP ƒ/2.2 (Ultra Wide) |
| OIS | Yes | Yes |
| Auto Focus | Yes, Laser AF | Yes |
| Features | Bixby Vision, Dual Recording, Food, Hyperlapse, Night, Panorama, Photo, Portrait, Portrait Video, Pro, Pro Video, Single Take, Slow Motion, Video, Upto 100X Digital Zoom | Auto-HDR, Panorama |
| Video Recording | 8K @ 24/30 fps UHD, 4K @ 120/30/60 fps UHD, 1080p @ 240/30/60 fps FHD | 8K @ 24 fps UHD, 4K @ 30/60 fps UHD, 1080p @ 240/30/60 fps FHD, 720p @ 960 fps HD |
| Flash | Yes, LED | Yes, LED |
| Front Camera | 12 MP ƒ/2.2 (Wide Angle) 26mm (Wide), 1/3.2", 1.12µm, Dual Pixel PDAF Punch Hole, Autofocus, Screen Flash | 40 MP ƒ/2.2 (Wide Angle) Punch Hole, Autofocus |
| Front Video Recording | 4K @ 30/60 fps UHD, 1080p @ 30 fps FHD | 4K @ 30/60 fps UHD, 1080p @ 30 fps FHD |
| Technical | ||
| OS | Android v15 | Android v10 |
| Custom UI | One UI 7 | |
| Chipset | Qualcomm Snapdragon 8 Elite | Samsung Exynos 2100 |
| CPU | 4.32 GHz, Octa Core Processor | 2.9 GHz, Octa Core Processor |
| Core Details | 2x4.47 GHz Oryon V2 Phoenix L + 6x3.53 GHz Oryon V2 Phoenix M | 1x2.9 GHz Cortex-X1 & 3x2.80 GHz Cortex-A78 & 4x2.2 GHz Cortex-A55 |
| GPU | Adreno 830 | Mali-G78 MP14 |
| Java | No | No |
| Browser | Yes | Yes |
| Multimedia | ||
| Yes | Yes | |
| Music | Yes | Yes |
| Video | Yes | Yes |
| FM Radio | No | No |
| Document Reader | Yes | Yes |
| Battery | ||
| Type | Non-Removable Battery | Non-Removable Battery |
| Size | 5000 mAh, Li-ion Battery | 5000 mAh, Li-Po Battery |
| Fast Charging | Yes, 45W Fast Charging PD3.0, 65% in 30 min | Yes, 25W Fast Charging |
| Wireless Charging | Yes, 15W | Yes, 15W |
| Reverse Charging | Yes, 10W | Yes, 4.5W |
| Reverse Wireless Charging | Yes, 4.5W | |
| Video Playback Time | 31 hours | |