Samsung Galaxy A18 4G vs Samsung Galaxy S21 Ultra 5G
Side-by-side specs and price comparison for buyers in Algeria.
Samsung Galaxy A18 4G
2category wins
Samsung Galaxy S21 Ultra 5G
2category wins
Quick Verdict
Who wins each category, side by side.
Better price
Samsung Galaxy A18 4G
Faster chip
Even
Bigger battery
Even
Faster charging
Even
Higher-resolution camera
Samsung Galaxy S21 Ultra 5G
Better display
Samsung Galaxy S21 Ultra 5G
Lighter body
Samsung Galaxy A18 4G
Best value for money
Even
Full specs comparison
Display
| Spec | Samsung Galaxy A18 4G | Samsung Galaxy S21 Ultra 5G |
|---|---|---|
| Size (inches) | 6.7 | 6.8 |
| Panel Type | AMOLED | AMOLED |
| Resolution Height | 2340 | 3200 |
| Resolution Width | 1080 | 1440 |
| Refresh Rate | 90 | 120 |
| Peak Brightness | — | 1500 |
| PPI | 385 | 515 |
| Glass Type | Corning Gorilla Glass 3 | Corning Gorilla Glass Victus |
| Screen-to-body | 86 | 89.8 |
Platform
| Spec | Samsung Galaxy A18 4G | Samsung Galaxy S21 Ultra 5G |
|---|---|---|
| CPU | Octa-core (2x2.4 GHz Cortex-A7X & 6x2.0 GHz Cortex-A55) | Octa-core (1x2.9 GHz Cortex-X1 & 3x2.80 GHz Cortex-A78 & 4x2.2 GHz Cortex-A55) |
| GPU | Mali-G68 | Mali-G78 MP14 (International) / Adreno 660 (USA/China) |
| Chipset Name | Exynos 1610 | Exynos 2100 (International) / Snapdragon 888 5G (USA/China) |
| Process (nm) | — | 5 |
| OS Name | Android | Android |
| UI Skin | One UI 9 | One UI 6.1 |
| OS Version | 17 | 11 |
Benchmarks
| Spec | Samsung Galaxy A18 4G | Samsung Galaxy S21 Ultra 5G |
|---|---|---|
| Geekbench (Single-Core) | — | 1,435 (Exynos 2100) / 1,500 (Snapdragon 888 5G) |
| Geekbench (Multi-Core) | — | 3,555 (Exynos 2100) / 3,537 (Snapdragon 888 5G) |
| AnTuTu | — | 1,065,369 (Exynos 2100) / 1,135,878 (Snapdragon 888 5G) |
Memory
| Spec | Samsung Galaxy A18 4G | Samsung Galaxy S21 Ultra 5G |
|---|---|---|
| Card Slot | microSDXC (uses shared SIM slot) | No |
| Variants | 64GB 4GB RAM, 128GB 4GB RAM, 256GB 4GB RAM | 128GB 8GB RAM, 128GB 12GB RAM, 256GB 12GB RAM, 256GB 16GB RAM, 512GB 12GB RAM, 512GB 16GB RAM |
Main Camera
| Spec | Samsung Galaxy A18 4G | Samsung Galaxy S21 Ultra 5G |
|---|---|---|
| Video | 1080p@30fps | 8K@24fps, 4K@30/60fps, 1080p@30/60/120/240fps, HDR10 + , stereo sound rec., gyro-EIS |
| Features | LED flash, panorama, HDR | Laser AF, LED flash, auto-HDR, panorama |
| Count | 3 | 4 |
| Macro | 2 MP, (macro) | — |
| periscope telephoto | — | 10 MP, f/4.9, 240mm, (periscope telephoto) |
| Telephoto | — | 10 MP, f/2.4, 72mm, (telephoto) |
| ultrawide | 5 MP, f/2.2, (ultrawide) | 12 MP, f/2.2, 13mm, (ultrawide) |
| Wide | 50 MP, f/1.8, (wide) | 108 MP, f/1.8, 24mm, (wide) |
Selfie Camera
| Spec | Samsung Galaxy A18 4G | Samsung Galaxy S21 Ultra 5G |
|---|---|---|
| Video | 1080p@30fps | 4K@30/60fps, 1080p@30fps |
| Features | — | HDR |
| Count | 1 | 1 |
| Lens | 13 MP, f/2, (wide) | 40 MP, f/2.2, 26mm, (wide) |
Battery
| Spec | Samsung Galaxy A18 4G | Samsung Galaxy S21 Ultra 5G |
|---|---|---|
| Capacity (mAh) | 5000 | 5000 |
| Chemistry | — | Li-Ion |
| Wired Charging (W) | 25 | 25 |
| Wireless Charging (W) | — | 15 |
Body
| Spec | Samsung Galaxy A18 4G | Samsung Galaxy S21 Ultra 5G |
|---|---|---|
| Build | Glass front (Gorilla Glass 3), plastic back, plastic frame | Glass front (Gorilla Glass Victus), glass back (Gorilla Glass Victus), aluminum frame |
| SIM | Nano-SIM + Nano-SIM | Nano-SIM + eSIM / Nano-SIM + Nano-SIM + eSIM (max 2 at a time) |
| Height (mm) | 164.4 | 165.1 |
| Thickness (mm) | 7.7 | 8.9 |
| Other | IP64 dust tight and water resistant (water splashes) | — |
| Weight (g) | 196 | 227 |
| Width (mm) | 77.9 | 75.6 |
Launch
| Spec | Samsung Galaxy A18 4G | Samsung Galaxy S21 Ultra 5G |
|---|---|---|
| Announced | 2026, September 15 | 2021, January 14 |
| Status | Available. Released 2026, September 18 | Available. Released 2021, January 29 |
Network
| Spec | Samsung Galaxy A18 4G | Samsung Galaxy S21 Ultra 5G |
|---|---|---|
| 2G Bands | GSM 850, 900, 1800, 1900 | GSM 850, 900, 1800, 1900 |
| 3G Bands | HSDPA 850, 900, 2100 | HSDPA 850, 900, 1700(AWS), 1900, 2100 |
| 4G Bands | 1, 3, 5, 7, 8, 20, 28, 38, 40, 41 | 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 30, 38, 39, 40, 41, 46, 48, 66, 71 - SM-G998U1 |
| 5G Bands | — | 2, 5, 25, 41, 66, 71, 260, 261 SA/NSA/Sub6/mmWave - SM-G998U1 |
| Speed | HSPA, LTE | HSPA 42.2/5.76 Mbps, LTE (7CA) Cat20 2000/200 Mbps, 5G (5 + Gbps DL) |
| Technology | GSM, HSPA, LTE | GSM, CDMA, HSPA, EVDO, LTE, 5G |
Connectivity
| Spec | Samsung Galaxy A18 4G | Samsung Galaxy S21 Ultra 5G |
|---|---|---|
| Bluetooth | 5.3 | 5.2 |
| NFC | Yes (market/region dependent) | Yes |
| Positioning | GPS, GALILEO, GLONASS, BDS, QZSS | GPS, GLONASS, BDS, GALILEO |
| Radio | Unspecified | FM radio (Snapdragon model only; market/operator dependent) |
| USB Type | Type-C | Type-C |
| USB Version | 2.0 | 3.2 |
| Wi-Fi | Wi-Fi 5 | Wi-Fi 6E |
Sound
| Spec | Samsung Galaxy A18 4G | Samsung Galaxy S21 Ultra 5G |
|---|---|---|
| 3.5mm Jack | No | No |
| Loudspeaker | Yes | Yes, with stereo speakers |
Features
| Spec | Samsung Galaxy A18 4G | Samsung Galaxy S21 Ultra 5G |
|---|---|---|
| Sensors | Fingerprint (side-mounted), accelerometer, gyro, compass | Fingerprint (under display, ultrasonic), accelerometer, gyro, proximity, compass, barometer |
| Other | Virtual proximity sensing | — |
Buying advice for Algeria
Both Samsung Galaxy A18 4G and Samsung Galaxy S21 Ultra 5G are sold in Algeria, but they fit different priorities.
Both phones sit in the same price band, so the choice comes down to specs and brand preference.
Samsung Galaxy S21 Ultra 5G reaches a higher main-sensor resolution at 108 MP, which helps with crops and lower-light photos.
Above 60,000 DZD, prioritise screen quality, fast charging, and a clear software-update commitment.
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