Phone Comparison - Karbonn A21 vs Alcatel One Touch Star vs Karbonn A91
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| Manufacturer | Karbonn | Alcatel | Karbonn |
| Announced | 2012 | February 2013 | January 2014 |
| Status | Available | Available - March 2013 | Available - January 2014 |
| Colors | Pearl White | Black, White, Orange | White, Black, Pink |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension | - |
117.9 x 60.8 x 9.7 mm (4.64 x 2.39 x 0.38 in) |
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| Weight | - | 119.5 g (4.2.0.18 oz) | - |
| 2G Network | GSM 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 - 6010 GSM 850 / 900 / 1800 / 1900 - 6010D (SIM 1 & SIM 2) |
GSM 900 / 1800 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 2100 | HSDPA 900 / 2100 | No |
| Messaging | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, EMail, IM | SMS, MMS, EMail, IM |
| Build Features | - | - | Swipe Gesture |
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| OS | Android OS, v4.0 (Ice Cream Sandwich) | Android OS, v4.1 (Jelly Bean) | Android OS, v4.2.2 (Jelly Bean) |
| Processor | Dual-core 1.2 GHz | Dual-core 1 GHz | Dual-core 1.3 GHz, MTK 6572 |
| GPU | - | - | Mali-400MP |
| RAM | 512 MB | 512 MB | 256 MB |
| Internal Memory | 4 GB | 4 GB (2.4 GB user available) | 512 MB ROM |
| External Memory | microSD, up to 32 GB | microSD, up to 32 GB | microSD, up to 32 GB |
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| Type | TFT capacitive touchscreen | AMOLED capacitive touchscreen | TFT Capacitive Touchscreen |
| Colors | 256K colors | 16M colors | 16M colors |
| Size | 4.5 inches | 4.0 inches | 4.0 inches |
| Resolution | 480 x 800 pixels (207 ppi) | 480 x 800 pixels (233 ppi) | 480 x 800 pixels (233 ppi) |
| Screen-to-Body Ratio | - | 63.66% | - |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | No | - | FM radio |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 5 MP, 2592х1944 pixels | 5 MP, 2592х1944 pixels | 3.2 MP, 2048x1536 pixels |
| Flash | LED flash | LED flash | No |
| Features | Auto focus, Geo-tagging, Face Detection | Auto focus, Geo-tagging | Geo-tagging |
| Video | Yes | Yes | Yes, 720p |
| Front Camera | Yes, 1.3 MP [Similar] | Yes, VGA [Similar] | Yes, VGA [Similar] |
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| GPRS | Yes | Yes | Yes |
| Edge | Yes | Yes | Yes |
| 3G | HSDPA, 7.2 Mbps | HSDPA, HSUPA | No |
| Bluetooth | Yes, v2.1 with A2DP | Yes, v4.0 with A2DP | Yes, v2.0 A2DP, EDR |
| Wi-Fi | Wi-Fi 802.11 b/g/n | Wi-Fi 802.11 b/g/n, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n, Wi-Fi hotspot |
| USB | Yes, microUSB v2.0 | Yes, microUSB v2.0 | Yes, microUSB v2.0 |
| GPS | Yes, with A-GPS support | Yes | No |
| Browser | HTML | HTML | HTML |
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| Internal | 4 GB, 512 MB RAM | 4 GB (2.4 GB user available), 512 MB RAM | 512 MB ROM, 256 MB RAM |
| Expandable Storage | microSD, up to 32 GB | microSD, up to 32 GB | microSD, up to 32 GB |
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| Fingerprint | |
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| Proximity Sensor | |
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| Accelerometer Sensor | |
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| NFC | |
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| Type | Li-Ion Battery | Li-Ion Battery | Li-Ion Battery |
| Capacity | 1800 mAh | 1500 mAh | 1500 mAh |
| Stand by | Up to 200 h | Up to 300 h (2G) Up to 280 h (3G) |
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| Talk Time | Up to 5 h | Up to 4 h 30 min (2G) Up to 3 h 30 min (3G) |
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