Xiaomi Redmi 6 Pro vs Vivo X21UD
| Type | Touch | Touch |
| Dimensions | 149.33 x 71.68 x 8.75 mm | 154.45 x 74.78 x 7.37 mm |
| Weight | 178.00 g | 156.20 g |
| Display size | 5.84" | 6.28" |
| Display | Color / IPS TFT 16M colors 1080 x 2280 px (5.84") 432 ppi | Color / Super AMOLED 16M colors 1080 x 2280 px (6.28") 402 ppi |
| Display protection | ||
| Additional display | ||
| Protection of the secondary display | ||
| Standard battery | Li-Ion 4000 mAhBuy powerbank
| Li-Ion 3200 mAhBuy powerbank
|
| Quick battery charging | ||
| Wireless battery charging | ||
| Internal memory | 16 GB, 32 GB, 64 GB | 128 GB |
| End-user memory | UNKNOWN, 21.5 GB, 53.15 GB | |
| RAM memory | 2 GB, 3 GB, 4 GB | 6 GB |
| Memory cards | microSD, microSDHC, microSDXC up to 256 GBBuy memory card | microSD, microSDHC, microSDXC up to 256 GBBuy memory card |
| Operating system | Android 8.1 Oreo | Android 8.1 Oreo |
| Interface | MIUI 9.6.6 | Funtouch 4.0 |
| Processor | Qualcomm Snapdragon 625 8953 | Qualcomm Snapdragon 660 |
| Processor clock | 2000 MHz | 2200 MHz |
| GPU | Adreno 506 | Adreno 512 |
| Touchscreen | ||
| DualSIM | ||
| SIM cards standard | DualSIM(nanoSIM, nanoSIM) | DualSIM(nanoSIM, nanoSIM) |
| DualSIM mode | dual standby | dual standby |
| Hybrid DualSIM | ||
| Announced | 3Q 2018 | 1Q 2018 |
| Other names | M1805D1SE | Vivo X21 UD; Vivo X21 Screen Fingerprint |
| GSM frequencies | 850 900 1800 1900 | 850 900 1800 1900 |
| UMTS | 850 900 1900 2100 | 850 900 1900 2100 |
| LTE standard | FDD LTE: 2600, 2100, 1800, 900, 850 TDD LTE: 2600, 2500, 2300, 2100, 1900 | FDD LTE: 2100, 1900, 1800, 1700, 900, 850 TDD LTE: 2600, 2500, 2300, 2100, 1900 |
| CDMA | 850 CDMA2000 1xEV-DO | 850 |
| Standard TD-SCDMA | 1900 2000 | 1900 2000 |
| UMA |

