| Sony Ericsson Z520 | ViewSonic ViewPad 4 |
| Manufacture | Sony Ericsson | ViewSonic |
| Model | Z520 | ViewPad 4 |
| Form factor | Clamshell/fold | Block |
| Weight | 96 gram | NA |
| Dimensions (HxWxD) | 83 x 46 x 24 | 121.00 x 66.00 x 11.00 |
| Operating System | Other | Android |
| Networks | 2G - 850/900/1800/1900 | 2G - 800/850/1800/1900 3G - 900/2100 |
| HSCSD |  |  |
| GPRS | | |
| EDGE | | |
| UMTS | | |
| HSDPA | | |
| HSPA+ | | |
| WiMAX | | |
| LTE (4G light) | | |
| WLAN / Wi-Fi | | |
| Wi-Fi Hotspot | | |
| Wi-Fi Direct | | |
| SMS | | |
| MMS | | |
| | |
| HDMI out | | |
| USB port | | |
| MHL | | |
| Bluetooth | | |
| Bluetooth version | NA | NA |
| DLNA | | |
| GPS | | |
| Glonass | | |
| ANT+ | | |
| IrDA | | |
| NFC | | |
| 3.5 mm audio connector | | |
| Camera | | |
| Camera resolution | 0.3 Megapixels (640x480) | 5 megapixel, autofocus |
| Image Stabilization | | |
| BSI sensor | | |
| Camera Flash/Light | | |
| Flash type | NA | NA |
| Video recording | | |
| Video capture resolution | NA | NA |
| Second Camera | NA | VGA (640 x 480) |
| Display size | 1.8 inches | 4.10 |
| Touchscreen | | |
| Colour display | | |
| Number of colours | 65000 | 16000000 |
| Display width | 126 | 480 |
| Display height | 160 | 800 |
| PPI | 113.14 | 227.55 |
| Second Display | NA | NA |
| CPU | NA | 1 GHz Qualcomm MSM 8255 |
| GPU | NA | NA |
| Memory | 16MB | 512 MB |
| Micro SIM | | |
| Dual SIM | | |
| MP3 | | |
| Ringtones / Music file format | Polyphonic | MP3 |
| Java | | |
| Games | Java | Yes |
| FM Radio | | |
| Battery | Li-Ion 900 mAh | NA |
| Standby time (h) | 400 | NA |
| Talktime (m) | 540 | NA |
| Wireless Charging | | |
| Browser | 2.0 XHTML | Android HTML Webkit |
| Calendar | | |
| Voicedialing | | |
| IP Code | NA | NA |
| Predictive text | | |
| RSS reader | | |
| Voicememo | | |
| PC Synchronization | | NA |
| SyncML | | |
| Website | Website | Website |