Samsung Galaxy S21 Ultra 5G (16GB RAM + 512GB) vs Samsung Galaxy S25 Plus (12GB RAM + 512GB)
Quick Comparison
Samsung Galaxy S21 Ultra 5G (16GB RAM + 512GB) has better RAM than Samsung Galaxy S25 Plus (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 Plus (12GB RAM + 512GB) which has resolution of 3120 x 1440. Both have the same amount of internal memory.
| Name | Samsung Galaxy S21 Ultra 5G (16GB RAM + 512GB) | Samsung Galaxy S25 Plus (12GB RAM + 512GB) |
| RAM | 16 GB | 12 GB |
|---|---|---|
| Display | 6.8 in | 6.7 in |
| Internal Memory | 512 GB | 512 GB |
| Battery | 5000 mAh | 4900 mAh |
| Camera | 108 MP Quad | 50 MP + 12 MP + 10 MP Triple |
| Price | Rs. 111999 | Rs. 86999 |
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Detailed Comparison
Price And Launch
The launch Date of the first phone is January 14, 2021. The cost of Samsung Galaxy S21 Ultra 5G (16GB RAM + 512GB) is Rs. 111999. The launch Date of the second phone is January 22, 2025. The cost of Samsung Galaxy S25 Plus (12GB RAM + 512GB) is Rs. 86999.
Display comparison
Samsung Galaxy S21 Ultra 5G (16GB RAM + 512GB) has larger screen size of 6.8 inches in comparison to Samsung Galaxy S25 Plus (12GB RAM + 512GB)'s 6.7 inch screen. Samsung Galaxy S21 Ultra 5G (16GB RAM + 512GB) has Screen type where as Samsung Galaxy S25 Plus (12GB RAM + 512GB) has LTPO AMOLED Screen type. Samsung Galaxy S21 Ultra 5G (16GB RAM + 512GB) has display density of 515 PPI & Samsung Galaxy S25 Plus (12GB RAM + 512GB) has only 513 PPI display density. In terms of screen to body ratio, Samsung Galaxy S25 Plus (12GB RAM + 512GB) has better screen to body ratio of ~ 91.8% than Samsung Galaxy S21 Ultra 5G (16GB RAM + 512GB)'s ~ 89.8%. Samsung Galaxy S21 Ultra 5G (16GB RAM + 512GB) has 20:9 aspect ratio where as Samsung Galaxy S25 Plus (12GB RAM + 512GB) has 20.5:9 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 Plus (12GB RAM + 512GB)'s lower 12 GB RAM. and both have same Internal Memory of 512 GB.
Camera comparison
Samsung Galaxy S21 Ultra 5G (16GB RAM + 512GB)'s 108 MP Quad Rear Camera outclasses Samsung Galaxy S25 Plus (12GB RAM + 512GB)'s 50 MP + 12 MP + 10 MP Triple 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 Plus (12GB RAM + 512GB)'s 12 MP Front Camera.
Technical comparison
Both the phones has Android Operating System but the first one runs on version 10 and the second one on 15 version.
Related Comparisons
Full Comparison
| Name | Samsung Galaxy S21 Ultra 5G (16GB RAM + 512GB) | Samsung Galaxy S25 Plus (12GB RAM + 512GB) |
| General | ||
| Country of Origin | India | |
| Model | Galaxy S21 Ultra 5G | SM-S936B, SM-S936B/DS, SM-S936U, SM-S936U1, SM-S936W, SM-S936N, SM-S9360, SM-S936E, SM-S936E/DS,SM-S936BZSCINS |
| Sim Type | Dual Sim, GSM+GSM | Dual Sim, GSM+GSM |
| Dual Sim | Yes | Yes |
| Sim Size | Nano+Nano SIM | eSIM+eSIM SIM |
| Device Type | Smartphone | Smartphone |
| Release Date | January 14, 2021 | January 22, 2025 |
| In The Box | Handset, Data Cable (Type C to C), Sim Ejection Pin | |
| Design | ||
| Dimensions | 75.6 x 165.1 x 8.9 mm | 75.8 x 158.4 x 7.3 mm |
| Weight | 227 g | 190 g |
| Bezel less | Yes | |
| Colors | Icy Blue, Mint, Navy, Silver Shadow | |
| Display | ||
| Type | Color Dynamic AMOLED 2X (16M Colors) | Color LTPO AMOLED Screen (1B Colors) |
| Touch | Yes | Yes |
| Size | 6.8 inches, 1440 x 3200 pixels, 120 Hz | 6.7 inches, 1440 x 3120 pixels, 120 Hz |
| Aspect Ratio | 20:9 | 20.5:9 |
| PPI | ~ 515 PPI | ~ 513 PPI |
| Screen to Body Ratio | ~ 89.8% | ~ 91.8% |
| Glass Type | Corning Gorilla Glass Victus | Corning Gorilla Glass Victus 2 |
| Features | Always-on Display, HDR10+ | HDR10+, 2600 nits (peak) |
| Notch | Yes, Punch Hole | Yes, Punch Hole |
| Memory | ||
| RAM | 16 GB | 12 GB |
| Storage | 512 GB | 512 GB |
| Storage Type | UFS 3.1 | UFS 4 |
| 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 |
| Vo5G | Yes | |
| 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 v3.2 |
| USB Features | USB on-the-go, USB Charging | USB on-the-go, USB Charging |
| Performance | ||
| AnTuTu Score | 2,193,691 (Total) (v10) 518,255 (CPU) 884,552 (GPU) 449,756 (Memory) 341,128 (UX) | |
| Extra | ||
| GPS | Yes, with A-GPS, GLONASS, BDS, GALILEO | Yes, with A-GPS, Glonass, Beidou, Galileo, QZSS |
| Fingerprint Sensor | Yes, In Display | Yes, In Display |
| Face Unlock | Yes | Yes |
| Sensors | Accelerometer, Gyro, Proximity, Compass, Barometer | 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 | |
| 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) | 50 MP ƒ/1.8 (Wide Angle) 24mm (wide), 1/1.56", 1.0µm, dual pixel PDAF, OIS 10 MP ƒ/2.4 (Telephoto) 67mm (telephoto), 1/3.94", 1.0µm, PDAF, OIS, 3x optical zoom 12 MP ƒ/2.2 (Ultra Wide) 13mm, 120˚ (ultrawide), 1/2.55" 1.4µm, Super Steady video |
| OIS | Yes | Yes |
| Auto Focus | Yes | Yes |
| Features | Auto-HDR, Panorama | Bixby Vision, Dual Recording, Food, Hyperlapse, Night, Panorama, Photo, Portrait, Portrait Video, Pro, Pro Video, Single Take, Slow Motion, Video |
| Video Recording | 8K @ 24 fps UHD, 4K @ 30/60 fps UHD, 1080p @ 240/30/60 fps FHD, 720p @ 960 fps HD | 8K @ 30 fps UHD, 4K @ 60 fps UHD, 1080p @ 30 fps FHD |
| Flash | Yes, LED | Yes, LED |
| Front Camera | 40 MP ƒ/2.2 (Wide Angle) Punch Hole, Autofocus | 12 MP ƒ/2.2 (Wide Angle) Punch Hole |
| Front Video Recording | 4K @ 30/60 fps UHD, 1080p @ 30 fps FHD | 4K @ 60 fps UHD, 1080p @ 60 fps FHD |
| Technical | ||
| OS | Android v10 | Android v15 |
| Custom UI | One UI 7 | |
| Chipset | Samsung Exynos 2100 | Qualcomm Snapdragon 8Elite |
| CPU | 2.9 GHz, Octa Core Processor | 4.47 GHz, Octa Core Processor |
| Core Details | 1x2.9 GHz Cortex-X1 & 3x2.80 GHz Cortex-A78 & 4x2.2 GHz Cortex-A55 | 2x4.47 GHz Oryon V2 Phoenix L + 6x3.53 GHz Oryon V2 Phoenix M |
| GPU | Mali-G78 MP14 | Adreno 830 |
| Java | No | No |
| Browser | Yes | Yes |
| Multimedia | ||
| Yes | Yes | |
| Music | Yes | MP3, M4A, 3GA, AAC, OGG, OGA, WAV, AMR, AWB, FLAC, MID, MIDI, XMF, MXMF, IMY, RTTTL, RTX, OTA, DFF, DSF, APE |
| Video | Yes | MP4, M4V, 3GP, 3G2, AVI, FLV, MKV, WEBM |
| FM Radio | No | No |
| Document Reader | Yes | Yes |
| Battery | ||
| Type | Non-Removable Battery | Non-Removable Battery |
| Size | 5000 mAh, Li-Po Battery | 4900 mAh, Li-ion Battery |
| Fast Charging | Yes, 25W Fast Charging | Yes, 45W |
| Wireless Charging | Yes, 15W | Yes, 15W |
| Reverse Charging | Yes, 4.5W | Yes |
| Reverse Wireless Charging | Yes, 4.5W | |