The verdict
Neither runs away with it: each wins something.
| Category | R15 | X21 |
|---|---|---|
| Design & display | 7.1 | 7.5 |
| Performance & hardware | 3.7 | 4.0 |
| Camera | 3.7 | 3.6 |
| Connectivity | 4.0 | 4.2 |
| Battery & charging | 3.1 | 2.7 |
Which one is for you?
Oppo R15, if you care about…
- Battery Capacity
- 3,450 mAh
- against 3,200 mAh
- RAM Capacity
- 8 GB
- against 6 GB
- RAM Type
- DDR4
- against LPDDR4
- Fast Charge Power
- 20 W
- against 18 W
vivo X21, if you care about…
- Bluetooth Version
- Bluetooth 5.0
- against Bluetooth 4.2
- Weight
- 156.2 g
- against 175 g
- Geekbench 6 Single-Core
- 342
- against 299
- Geekbench 6 Multi-Core
- 1,232
- against 1,155
Specification comparison
Performance
| Specification | R15 | X21 |
|---|---|---|
| Processor Model | MediaTek Helio P60 | Qualcomm Snapdragon 660 |
| Processor Process Size | 12 nm Best value | 14 nm |
| Graphics GPU | Mali-G72 MP3 | Qualcomm Adreno 512 |
| Storage Type | eMMC 5.1 | eMMC 5.1 |
| Maximum CPU Clock | 2 GHz | 2.2 GHz Best value |
| Maximum Storage Capacity | 128 GB | 128 GB |
| AnTuTu Score | 140,161 | — |
| Geekbench 6 Single-Core | 299 | 342 Best value |
| Geekbench 6 Multi-Core | 1,155 | 1,232 Best value |
| CPU Description | Octa-core processor with four 2.0 GHz Cortex-A73 cores and four 2.0 GHz Cortex-A53 cores | Octa-core CPU with 4 × 2.2 GHz Kryo 260 Gold cores and 4 × 1.8 GHz Kryo 260 Silver cores. |
| Processor Type | Octa-Core | Octa-Core |
| 64-Bit Processor | Yes | Yes |
| RAM Capacity | 8 GB Best value | 6 GB |
| RAM Type | DDR4 Best value | LPDDR4 |
| Expandable Storage | Yes | Yes |
| AnTuTu version | v7 | — |
| Maximum memory card | 256 GB | 256 GB |
Design
| Specification | R15 | X21 |
|---|---|---|
| Body Colors | Red, White, Purple, Pink | Black, White, Red |
| Body Thickness | 7.4 mm | 7.4 mm |
| Body Width | 75.2 mm | 74.8 mm |
| Body Height | 155.1 mm | 154.5 mm |
| Weight | 175 g | 156.2 g Best value |
| Usable Surface | — | 85.2 % |
| Body Materials | Glass, Aluminium Alloy | Glass, Aluminium Alloy |
| Unfolded thickness | — | 7.4 mm |
Battery
| Specification | R15 | X21 |
|---|---|---|
| Battery Capacity | 3,450 mAh Best value | 3,200 mAh |
| Battery Type | Li-Po | Li-Ion |
| Fast Charge Power | 20 W Best value | 18 W |
| Battery Features | Fast Charging, Battery Level Indicator, Rechargeable | Fast Charging, Battery Level Indicator, Rechargeable |
Display
| Specification | R15 | X21 |
|---|---|---|
| Display Aspect Ratio | 19:9 | 19:9 |
| Display Technology | AMOLED | Super AMOLED |
| Display Diagonal | 6.28″ | 6.28″ |
| Display Horizontal Resolution | 1,080 px | 1,080 px |
| Display Vertical Resolution | 2,280 px | 2,280 px |
| Display Pixel Density | 401 ppi | 402 ppi Best value |
| Display Features | Gorilla Glass 5, Capacitive Touch | Gorilla Glass 3, Capacitive Touch, Touchscreen |
Sensors
| Specification | R15 | X21 |
|---|---|---|
| Fingerprint Sensor Placement | Rear | Rear |
Sensor
| Specification | R15 | X21 |
|---|---|---|
| Sensor Features | Fingerprint Sensor, Accelerometer, Gyroscope, Proximity Sensor, Compass | Fingerprint Sensor, Accelerometer, Proximity Sensor, Compass, Gyroscope |
Software
| Specification | R15 | X21 |
|---|---|---|
| Operating System | Android 8.1 | Android 8 |
| OS Family | Android | Android |
| OS Version | 8 | 8 |
Connectivity
| Specification | R15 | X21 |
|---|---|---|
| SIM Configurations | Dual Nano-SIM | Dual Nano-SIM |
| Cellular Bands | 2G GSM 850, 2G GSM 900, 2G GSM 1800, 2G GSM 1900, 3G UMTS B850, 3G UMTS B900, 3G UMTS 1700 AWS, 3G UMTS 1900, 3G UMTS 2100, 4G LTE B1, 4G LTE B2, 4G LTE B3, 4G LTE B4, 4G LTE B5, 4G LTE B7, 4G LTE B8, 4G LTE B34, 4G LTE B38, 4G LTE B39, 4G LTE B40, 4G LTE B41 | 2G GSM 850, 2G GSM 900, 2G GSM 1800, 2G GSM 1900, 3G UMTS B850, 3G UMTS B900, 3G UMTS 1900, 3G UMTS 2100, 4G LTE B1, 4G LTE B2, 4G LTE B3, 4G LTE B5, 4G LTE B8, 4G LTE B34, 4G LTE B38, 4G LTE B39, 4G LTE B40, 4G LTE B41 |
| Cellular Technologies | GSM, CDMA, HSPA, LTE, UMTS, 4G | GSM, CDMA, HSPA, UMTS, LTE, 4G |
| Wi-Fi Standards | Wi-Fi 802.11a/b/g/n/ac | Wi-Fi 802.11a/b/g/n/ac, Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac) |
| Wi-Fi Features | Dual Band, Wi-Fi Direct | Dual Band, Wi-Fi Direct |
| Bluetooth Version | Bluetooth 4.2 | Bluetooth 5.0 Best value |
| Bluetooth Profiles | A2DP, LE, EDR | A2DP, LE |
| Navigation Systems | GPS, GLONASS | GPS, GLONASS |
| Connectivity Features | 3.5 mm Audio Jack, microUSB, USB OTG, FM Radio | 3.5 mm Audio Jack, FM Radio, USB OTG, microUSB |
| USB Version | microUSB | USB 2.0 |
| SAR American Head | — | 0.57 W/kg |
| SAR American Body | — | 1.18 W/kg |
| Max. download speed | 150 Mbps | 300 Mbps Best value |
| Max. upload speed | 50 Mbps | 50 Mbps |
Audio
| Specification | R15 | X21 |
|---|---|---|
| Microphone Count | 2 | 2 |
| Audio Features | A2DP, LE, EDR, Loudspeaker | A2DP, LE, Loudspeaker, 32-bit/192 kHz Audio |
Technical
| Specification | R15 | X21 |
|---|---|---|
| Model numbers | PACM00, CPH1835, PACT00, PAAT00 | 1725, X21A |
