| Hardware and OS | OPPO Muse R821 | vivo Y11 |
| Operating system | Android 4.2 | Android 4.4.4 (KitKat) |
| Processor | MediaTek MT6572 | Quad-core 1.3 GHz Cortex-A7 |
| Chipset | | Mediatek MT6582М |
| Processor cores number | 2 | |
| GPU | Mali-400 MP | Mali-400MP2 |
| RAM | 512 Mb | |
| Internal memory | | 4 GB, 512 MB RAM |
| Internal Storage | 2.50 GB | |
| External memory | | microSD, up to 256 GB (dedicated slot) |
| Memory Card Slot | yes | |
| Display | OPPO Muse R821 | vivo Y11 |
| Type | colored IPS, sensor | IPS LCD |
| Size | 4" | 4" inc |
| Resolution | 800x480 | 480 x 800 px |
| Touchscreen | multitouch, capacitive | capacitive touchscreen |
| Screen-to-Body Ratio | | 59.2% |
| Display area | | 45.5 cm2 |
| Display aspect ratio | | 5:3 (height:width) |
| Aspect Ratio | 5:3 | |
| Pixel Density | 233 | 233 PPI |
| Colors | | 16M |
| Connectivity | OPPO Muse R821 | vivo Y11 |
| Standard | GSM 900/1800/1900, 3G | |
| Interfaces | Wi-Fi, Bluetooth 2.1, USB | |
| 2G Network | | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| Multi SIM mode | alternate | |
| Wi-Fi | | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot |
| SIM | regular micro SIM | |
| Network | | GSM / HSPA |
| SIM card | | Dual SIM (Micro-SIM, dual stand-by) |
| Bluetooth | | 4.0, A2DP, EDR |
| Edge | | Yes |
| GPRS | | Yes |
| GPS | | Yes, with A-GPS |
| Speed | | HSPA 21.1/7.2 Mbps |
| USB | | microUSB 2.0, USB Host |
| Camera | OPPO Muse R821 | vivo Y11 |
| Front camera | 0.3 megapixels | |
| Video Recording | yes | |
| Video resolution max | 1280x720 | |
| Main camera | 3 MP, 2048x1536 | 5 MP, Single |
| Specs | | 5 MP, AF |
| Features | | LED flash |
| Video | | 1080p@30fps |
| Selfie camera | | 2 MP, Single |
| Multimedia | OPPO Muse R821 | vivo Y11 |
| Audio | MP3, AAC, WAV, WMA, FM-radio | |
| Headphone jack | 3.5 mm | |
| 3.5 mm Jack | | Yes |
| Radio | | FM radio |
| Design | OPPO Muse R821 | vivo Y11 |
| Case type | classic | |
| Height | 123 mm | |
| Width | 63.5 mm | |
| Thickness | 9.9 mm | |
| Colors | | White, Black |
| Dimensions | | 123 x 62.5 x 8.8 mm |
| Weight | 124 grams | 124 g |
| Battery | OPPO Muse R821 | vivo Y11 |
| Capacity | 1700 mA?h | |
| Battery | removable panels | |
| Battery type | Li-Ion | |
| Connector type for charging | micro-USB | |
| Standby time | 280 hours | |
| Talk time | 6 hours | |
| Battery capacity | | 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 | OPPO Muse R821 | vivo Y11 |
| Release date | | 2014, Q4 |
| Sensors | illumination sensor, approaching sensor | Accelerometer, proximity , Infrared port |
