| Hardware and OS | Karbonn Smart A66 | vivo Y11 |
| Operating system | Android v4.4 (KitKat) | Android 4.4.4 (KitKat) |
| Processor | 1.2 GHz, Dual Core Processor | Quad-core 1.3 GHz Cortex-A7 |
| Chipset | | Mediatek MT6582М |
| RAM | 256 MB | |
| GPU | | Mali-400MP2 |
| Internal memory | 512 MB | 4 GB, 512 MB RAM |
| Memory Card Slot | Yes, upto 32 GB | |
| External memory | | microSD, up to 256 GB (dedicated slot) |
| Dual Sim | Yes | |
| Sim Type | Dual Sim, GSM GSM | |
| Display | Karbonn Smart A66 | vivo Y11 |
| Type | | IPS LCD |
| Size | | 4" inc |
| Screen Size | 3.5 inches, 320 x 480 pixels | |
| Resolution | | 480 x 800 px |
| Display Type | Color LCD screen | |
| Touchscreen | | capacitive touchscreen |
| Screen-to-Body Ratio | | 59.2% |
| Touch Screen | Yes | |
| Display area | | 45.5 cm2 |
| Display aspect ratio | 3:2 | 5:3 (height:width) |
| Pixel Density | ~165 PPI | 233 PPI |
| Colors | | 16M |
| Connectivity | Karbonn Smart A66 | vivo Y11 |
| 3G Network | No | |
| 2G Network | | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| Wi-Fi | | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot |
| Network | | GSM / HSPA |
| SIM card | | Dual SIM (Micro-SIM, dual stand-by) |
| Wifi | Yes, with wifi-hotspot | |
| Bluetooth | Yes | 4.0, A2DP, EDR |
| Edge | Yes | Yes |
| GPRS | Yes | Yes |
| GPS | No | Yes, with A-GPS |
| Speed | | HSPA 21.1/7.2 Mbps |
| USB | Yes | microUSB 2.0, USB Host |
| Camera | Karbonn Smart A66 | vivo Y11 |
| Flash | Yes, LED | |
| Main camera | 3 MP | 5 MP, Single |
| Specs | | 5 MP, AF |
| Features | | LED flash |
| Video | | 1080p@30fps |
| Selfie camera | 0.3 MP | 2 MP, Single |
| Multimedia | Karbonn Smart A66 | vivo Y11 |
| FM Radio | No | |
| Java | Yes, via 3rd party | |
| 3.5 mm Jack | | Yes |
| Radio | | FM radio |
| Design | Karbonn Smart A66 | vivo Y11 |
| Colors | | White, Black |
| Dimensions | | 123 x 62.5 x 8.8 mm |
| Weight | | 124 g |
| Battery | Karbonn Smart A66 | vivo Y11 |
| Type | Removable Battery | |
| Battery capacity | 1100 mAh, Li-ion Battery | 1700 mAh, Removable Li-Po |
| Battery life | | Talking time- Up to 11 h (2G) / Up to 8 h (3G)
Music play - Up to 34 h |
| Other | Karbonn Smart A66 | vivo Y11 |
| Release date | | 2014, Q4 |
| Sensors | | Accelerometer, proximity , Infrared port |
