vivo X21 vs vivo Z3i
Side-by-side specs and price comparison for buyers in Algeria.
vivo X21
Price coming soon
vivo Z3i
Price coming soon
Quick Verdict
Who wins each category, side by side.
Better price
Even
Faster chip
Even
Bigger battery
vivo Z3i
Faster charging
Even
Higher-resolution camera
vivo Z3i
Better display
vivo X21
Lighter body
vivo X21
Best value for money
Even
Full specs comparison
Display
| Spec | vivo X21 | vivo Z3i |
|---|---|---|
| Size (inches) | 6.28 | 6.3 |
| Panel Type | AMOLED | IPS LCD |
| Resolution Height | 2280 | 2280 |
| Resolution Width | 1080 | 1080 |
| PPI | 402 | 400 |
| Glass Type | Corning Gorilla Glass 3 | — |
| Screen-to-body | 85.2 | 84 |
Platform
| Spec | vivo X21 | vivo Z3i |
|---|---|---|
| CPU | Octa-core (4x2.2 GHz Kryo 260 Gold & 4x1.8 GHz Kryo 260 Silver) | Octa-core (4x2.0 GHz Cortex-A73 & 4x2.0 GHz Cortex-A53) |
| GPU | Adreno 512 | Mali-G72 MP3 |
| Chipset Name | Snapdragon 660 | Helio P60 |
| Process (nm) | 14 | 12 |
| OS Name | Android | Android |
| OS Version | 8.1 | 8.1 |
Memory
| Spec | vivo X21 | vivo Z3i |
|---|---|---|
| Card Slot | microSDXC (uses shared SIM slot) | microSDXC (dedicated slot) |
| Variants | 64GB 6GB RAM, 128GB 6GB RAM | 128GB 6GB RAM |
Main Camera
| Spec | vivo X21 | vivo Z3i |
|---|---|---|
| Video | 1080p@30fps | 1080p@30fps |
| Features | LED flash, HDR, panorama | LED flash, HDR, panorama |
| Count | 2 | 2 |
| Depth | 5 MP, f/2.4, (depth) | 2 MP, f/2.4, (depth) |
| Lens | 12 MP, f/1.8 | 16 MP, f/2 |
Selfie Camera
| Spec | vivo X21 | vivo Z3i |
|---|---|---|
| Video | 1080p@30fps | 1080p@30fps |
| Features | — | HDR |
| Count | 1 | 1 |
| Lens | 12 MP, f/2, (wide) | 24 MP, f/2, 26mm, (wide) |
Battery
| Spec | vivo X21 | vivo Z3i |
|---|---|---|
| Capacity (mAh) | 3200 | 3315 |
| Chemistry | Li-Ion | — |
| Wired Charging (W) | 18 | 18 |
Body
| Spec | vivo X21 | vivo Z3i |
|---|---|---|
| Build | Glass front (Gorilla Glass 3), aluminum back, aluminum frame | — |
| SIM | Nano-SIM + Nano-SIM | Nano-SIM + Nano-SIM |
| Height (mm) | 154.5 | 156 |
| Thickness (mm) | 7.4 | 8.1 |
| Weight (g) | 156.2 | 164 |
| Width (mm) | 74.8 | 75.6 |
Launch
| Spec | vivo X21 | vivo Z3i |
|---|---|---|
| Announced | 2018, March. Released 2018, March | 2018, October. Released 2018, October |
| Status | Discontinued | Discontinued |
Network
| Spec | vivo X21 | vivo Z3i |
|---|---|---|
| 2G Bands | GSM 850, 900, 1800, 1900 | GSM 850, 900, 1800, 1900 |
| 3G Bands | HSDPA 850, 900, 1900, 2100 | HSDPA 850, 900, 2100 |
| 4G Bands | 1, 2, 3, 5, 8, 34, 38, 39, 40, 41 | 1, 3, 5, 8, 34, 38, 39, 40, 41 |
| Speed | HSPA 42.2/5.76 Mbps, LTE (2CA) Cat6 300/50 Mbps | HSPA, LTE |
| Technology | GSM, CDMA, HSPA, LTE | GSM, CDMA, HSPA, LTE |
Connectivity
| Spec | vivo X21 | vivo Z3i |
|---|---|---|
| Bluetooth | 5 | 4.2 |
| NFC | No | No |
| Positioning | GPS, GLONASS | GPS, GLONASS, BDS |
| Radio | FM radio | FM radio |
| USB Version | 2.0 | 2.0 |
| Wi-Fi | Wi-Fi 5 | Wi-Fi 5 |
Sound
| Spec | vivo X21 | vivo Z3i |
|---|---|---|
| 3.5mm Jack | Yes | Yes |
| Loudspeaker | Yes | Yes |
Features
| Spec | vivo X21 | vivo Z3i |
|---|---|---|
| Sensors | Fingerprint (rear-mounted), accelerometer, proximity, compass | Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass |
Buying advice for Algeria
Both vivo X21 and vivo Z3i are sold in Algeria, but they fit different priorities.
vivo Z3i packs a 3315 mAh battery, which translates to longer screen-on time when you are away from a charger.
vivo Z3i reaches a higher main-sensor resolution at 16 MP, which helps with crops and lower-light photos.
Other popular comparisons
Samsung Galaxy S26 Ultra vs Apple iPhone 17 Pro Max
Samsung compared to Apple
Samsung Galaxy S26 Ultra vs Google Pixel 10 Pro XL
Samsung compared to Google
Samsung Galaxy S26 Ultra vs Xiaomi 15 Ultra
Samsung compared to Xiaomi
Apple iPhone 17 Pro Max vs Xiaomi 15 Ultra
Apple compared to Xiaomi
Apple iPhone 17 Pro Max vs Google Pixel 10 Pro XL
Apple compared to Google
Samsung Galaxy S26+ vs Apple iPhone 17
Samsung compared to Apple