| Hardware and OS | Celkon A21 | vivo Y11 |
| Operating system | Android 4.2.2 (Jelly Bean) | Android 4.4.4 (KitKat) |
| Processor | Quad-core 1.3 GHz Cortex-A7 | Quad-core 1.3 GHz Cortex-A7 |
| Chipset | Mediatek MT6582 (28 nm) | Mediatek MT6582М |
| GPU | Mali-400MP2 | Mali-400MP2 |
| Internal memory | 512 MB, 256 MB RAM | 4 GB, 512 MB RAM |
| External memory | microSD, up to 32 GB | microSD, up to 256 GB (dedicated slot) |
| Display | Celkon A21 | vivo Y11 |
| Size | 4" inc | 4" inc |
| Type | | IPS LCD |
| Resolution | 320 x 480 px | 480 x 800 px |
| Touchscreen | capacitive touchscreen | capacitive touchscreen |
| Screen-to-Body Ratio | 57.8% | 59.2% |
| Display area | 47.6 cm2 | 45.5 cm2 |
| Display aspect ratio | 3:2 (height:width) | 5:3 (height:width) |
| Pixel Density | 144 PPI | 233 PPI |
| Colors | | 16M |
| Connectivity | Celkon A21 | vivo Y11 |
| 2G Network | GSM 900 / 1800 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| Wi-Fi | Wi-Fi 802.11 b/g/n | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot |
| Network | GSM / HSPA | GSM / HSPA |
| SIM card | Dual SIM (Dual stand-by) | Dual SIM (Micro-SIM, dual stand-by) |
| Bluetooth | 4.0, A2DP | 4.0, A2DP, EDR |
| Edge | Yes | Yes |
| GPRS | Yes | Yes |
| GPS | No | Yes, with A-GPS |
| Speed | HSPA | HSPA 21.1/7.2 Mbps |
| USB | microUSB | microUSB 2.0, USB Host |
| Camera | Celkon A21 | vivo Y11 |
| Main camera | 3.15 MP, Single | 5 MP, Single |
| Specs | 3.15 MP | 5 MP, AF |
| Video | Yes | 1080p@30fps |
| Selfie camera | 1.3 MP, Single | 2 MP, Single |
| Features | | LED flash |
| Multimedia | Celkon A21 | vivo Y11 |
| 3.5 mm Jack | Yes | Yes |
| Radio | FM radio | FM radio |
| Design | Celkon A21 | vivo Y11 |
| Colors | Black, Blue, Red | White, Black |
| Dimensions | 124.8 x 66.1 x 10.8 mm | 123 x 62.5 x 8.8 mm |
| Weight | 115.3 g | 124 g |
| Battery | Celkon A21 | vivo Y11 |
| Battery capacity | 1500 mAh, Li-Ion | 1700 mAh, Removable Li-Po |
| Battery life | Stand by time- Up to 120 h (3G)
Talking time- Up to 8 h (3G)
| Talking time- Up to 11 h (2G) / Up to 8 h (3G)
Music play - Up to 34 h |
| Other | Celkon A21 | vivo Y11 |
| SAR | SAR EU - 0.99 W/kg (head) 1.39 W/kg (body) | |
| Release date | 2014 | 2014, Q4 |
| Sensors | Accelerometer | Accelerometer, proximity , Infrared port |
