Samsung Galaxy S25 Ultra vs. Samsung Galaxy S21 Plus

Samsung Galaxy S25 Ultra vs. Samsung Galaxy S21 Plus

Here’s a comprehensive comparison between the Samsung Galaxy S25 Ultra and the Samsung Galaxy S21 Plus:

Table of Contents

  • Size Comparison
  • Display Comparison
  • Battery Life
  • Charging Speed
  • Speaker Test
  • Performance
  • Benchmark Performance
  • Camera Comparison
  • Video Quality
  • Overall Verdict

📏 Size Comparison

Feature Samsung Galaxy S25 Ultra Samsung Galaxy S21 Plus
Height ~163.4 mm 161.5 mm
Width ~78.1 mm 75.6 mm
Thickness ~8.9 mm 7.8 mm
Weight ~234 g 202 g
Display Size 6.8 inches 6.7 inches
Screen-to-Body Ratio ~89% ~87%
Build Glass front & back, Titanium frame Glass front & back, Aluminum frame




🖥️ Display Comparison

Specification Galaxy S25 Ultra Galaxy S21 Plus
Size 6.9 inches 6.7 inches
Resolution 1440 x 3120 pixels 1080 x 2400 pixels
Pixel Density 498 ppi 394 ppi
Refresh Rate 120 Hz 120 Hz
Peak Brightness 2600 nits 1300 nits
Display Type QHD+ Dynamic LTPO AMOLED 2X Dynamic AMOLED 2X

🔋 Battery Life

Feature Samsung Galaxy S25 Ultra  Samsung Galaxy S21 Plus
Battery Capacity ~5,000 mAh 4,800 mAh
Charging Speed 45W wired, 15W wireless 25W wired, 15W wireless, 4.5W reverse wireless
Screen-on Time (SOT) ~8-10 hours ~6-8 hours
Battery Optimization Advanced AI-based power management (expected) AI-based power management
Processor Efficiency Snapdragon 8 Gen 4 or Exynos 2500 Exynos 2100 or Snapdragon 888 (5nm process)
Display Efficiency Dynamic LTPO AMOLED 2X (1-120Hz adaptive refresh rate) Dynamic AMOLED 2X (120Hz refresh rate)
Software Optimization One UI 7 (expected, based on Android 15) One UI 3.1 (upgradable to One UI 6, based on Android 14)
Standby Time ~2-3 days ~1.5-2 days
Real-World Usage Expected to last longer due to larger battery and efficiency improvements Good for moderate to heavy usage, but aging batteries may reduce performance over time

⚡ Charging Speed

Feature Samsung Galaxy S25 Ultra Samsung Galaxy S21 Plus
Battery Capacity ~5,000 mAh 4,800 mAh
Wired Charging Speed 45W 25W
Wireless Charging Speed 15W 15W
Reverse Wireless Charging Yes Yes
Charging Technology USB Power Delivery 3.0 USB Power Delivery 3.0
Time to 50% ~20-25 minutes ~30 minutes
Time to 100% ~60-70 minutes ~75-80 minutes
Fast Charging Support Yes Yes
Adapter Included Likely not No (25W adapter sold separately)




🔊 Speaker Test

Feature Samsung Galaxy S25 Ultra Samsung Galaxy S21 Plus
Speaker Type Stereo speakers (dual) with Dolby Atmos support Stereo speakers (dual) with Dolby Atmos support
Speaker Placement Bottom-firing + earpiece (hybrid stereo setup) Bottom-firing + earpiece (hybrid stereo setup)
Audio Quality Enhanced clarity, deeper bass, and improved spatial audio Good clarity and bass, but less advanced spatial audio
Volume Levels Louder and more balanced output Loud but slightly less balanced at higher volumes
Dolby Atmos Yes (improved tuning and wider soundstage) Yes (standard tuning)
3.5mm Headphone Jack No No
Bluetooth Audio Bluetooth 5.4, improved codec support Bluetooth 5.0, supports standard codecs (SBC, AAC, aptX)
Speaker Durability Improved water and dust resistance (IP68 or higher) IP68 water and dust resistance
Microphone Quality Enhanced noise cancellation and voice clarity Good noise cancellation and voice clarity
Audio Features AI-based sound optimization, adaptive audio tuning Standard sound optimization
Speaker Performance Superior for gaming, movies, and multimedia consumption Good for general use, but less immersive for multimedia

🚀 Performance

Feature Samsung Galaxy S25 Ultra Samsung Galaxy S21 Plus
Processor Qualcomm Snapdragon 8 Gen 4 or Exynos 2500 (4nm) Qualcomm Snapdragon 888 or Exynos 2100 (5nm)
CPU Octa-core (1x Cortex-X5 + 3x Cortex-A7xx + 4x Cortex-A5xx) Octa-core (1x Cortex-X1 + 3x Cortex-A78 + 4x Cortex-A55)
GPU Adreno 750 (Snapdragon) or Xclipse 950 (Exynos) Adreno 660 (Snapdragon) or Mali-G78 MP14 (Exynos)
RAM 12GB/16GB LPDDR5X 8GB LPDDR5
Storage 256GB/512GB/1TB UFS 4.0 128GB/256GB UFS 3.1
AI Engine Next-gen AI engine with improved NPU 5th-gen AI engine with NPU
Cooling System Advanced vapor chamber cooling Standard vapor chamber cooling
Geekbench 6 (Est.) Single-core: ~2,300; Multi-core: ~7,500 Single-core: ~1,100; Multi-core: ~3,500
AnTuTu Benchmark (Est.) ~1,800,000+ ~700,000
5G Modem Integrated Snapdragon X75 or Exynos 5300 Integrated Snapdragon X60 or Exynos 5123
Wi-Fi Wi-Fi 7 (802.11be) Wi-Fi 6E (802.11ax)
Bluetooth Bluetooth 5.4 Bluetooth 5.2
Operating System Android 15 with One UI 7.0 Launched with Android 11, upgradable to Android 14
Performance Summary Significant leap in CPU/GPU performance, AI, and efficiency Solid performance for its time, but outdated compared to newer chipsets.

📊 Benchmark Performance

GeekBench 6

Specification Galaxy S25 Ultra Galaxy S21 Plus
Single-Core Score 2788 1094
Multi-Core Score 10098 3721

Antutu 10

Specification Galaxy S25 Ultra Galaxy S21 Plus
Total Score 3,088,959 643,775

3DMark

Specification Galaxy S25 Ultra Galaxy S21 Plus
Graphics Score 21628  5,538




📸 Camera Comparison

Feature Samsung Galaxy S25 Ultra  Samsung Galaxy S21 Plus
Main Camera 200 MP (f/1.7, 1/1.12″, PDAF, OIS) 12 MP (f/1.8, 1/1.76″, Dual Pixel PDAF, OIS)
Ultra-Wide Camera 48 MP (f/2.2, 120° FoV, 1/2.0″) 12 MP (f/2.2, 120° FoV, 1/2.55″)
Telephoto Camera 50 MP (f/3.4, 5x optical zoom, OIS) 64 MP (f/2.0, 1.1x optical zoom, PDAF, OIS)
Periscope Telephoto 10 MP (f/4.9, 10x optical zoom, OIS) N/A
Front Camera 40 MP (f/2.2, 1/2.8″, PDAF) 10 MP (f/2.2, 1/3.24″, Dual Pixel PDAF)
Video Recording 8K @ 30fps, 4K @ 120fps, HDR10+ 8K @ 24fps, 4K @ 60fps, HDR10+
Zoom Capabilities Up to 100x Space Zoom (hybrid) Up to 30x Space Zoom (hybrid)
Low-Light Performance Enhanced AI-based night mode, larger sensor size Decent low-light performance with Night Mode
AI Features Advanced AI scene optimization, real-time object tracking AI scene optimization, single take mode
Stabilization Improved Super Steady mode, OIS on all cameras Super Steady mode, OIS on main and telephoto cameras
Lens Quality Gorilla Glass DX+ lens coating Standard lens coating
Camera Software One UI 6.1 with enhanced camera app features One UI 3.1 with standard camera app features

🎥 Video Quality

Feature Samsung Galaxy S25 Ultra Samsung Galaxy S21 Plus
Max Video Resolution 8K @ 30fps (possibly 8K @ 60fps with upgrades) 8K @ 24fps
Stabilization Advanced AI Stabilization + Super Steady Mode 2.0 Super Steady Mode (1080p)
HDR Video Recording HDR10+, Dolby Vision HDR10+
Slow Motion 960fps @ 1080p, 480fps @ 4K 960fps @ 1080p, 240fps @ 4K
Zoom in Video Up to 20x Space Zoom (AI-enhanced) Up to 10x Space Zoom
Low-Light Video Enhanced Night Mode with AI for 4K/8K Standard Night Mode for 1080p/4K
Audio in Video Stereo Recording with 3D Audio, Wind Noise Reduction Stereo Recording with Wind Noise Reduction
Front Camera Video 4K @ 60fps with HDR10+ 4K @ 60fps
AI Features AI Scene Optimization, Auto Framing, Real-Time Editing AI Scene Optimization
Video Formats HEVC, H.264, ProRes HEVC, H.264
Bitrate Higher bitrate for 4K/8K Standard bitrate for 4K/8K




🏆 Overall Verdict

✔️ Pros:

  • Galaxy S25 Ultra:
    • ✅Superior display with higher resolution and brightness.
    • ✅Enhanced performance with the latest Snapdragon processor.
    • ✅Advanced camera system with higher megapixel count.
    • ✅Larger battery capacity with faster charging.
  • Galaxy S21 Plus:
    • ✅Lighter weight, making it more comfortable to handle.
    • ✅Proven performance and reliability over time.

❌ Cons:

  • Galaxy S25 Ultra:
    • ❌ Heavier and slightly bulkier design.
    • ❌ Higher price point.
  • Galaxy S21 Plus:
    • ❌ Lower display resolution and brightness.
    • ❌ Less powerful processor and camera system.
    • ❌ Slower charging speeds.

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