Lava Iris 51 vs Oppo A3s
| Type | Touch | Touch |
| Dimensions | 155.60 x 72.30 x 9.60 mm | 156.20 x 75.60 x 8.20 mm |
| Weight | 155.60 g | 168.00 g |
| Display size | 5.00" | 6.20" |
| Display | Color / IPS TFT 16M colors 720 x 1280 px (5.00") 259 ppi | Color / IPS TFT 16M colors 60 Hz 720 x 1520 px (6.20") 271 ppi |
| Display protection |   | Corning Gorilla Glass Buy screen protector
|
| Additional display | | |
| Protection of the secondary display | | |
| Standard battery | Li-Ion 2500 mAhBuy powerbank
| Li-Ion 4230 mAhBuy powerbank
|
| Quick battery charging | | |
| Wireless battery charging | | |
| Internal memory | 8 GB | 16 GB |
| RAM memory | 1 GB | 2 GB |
| Memory cards |  microSD, microSDHC, microSDXC up to 64 GBBuy memory card |  |
| Operating system | Android 8.1 Oreo Go | Android 8.1 Oreo |
| Interface | - | ColorOS 5.1 |
| Processor | Spreadtrum SC7731 | Qualcomm Snapdragon 450 |
| Processor clock | 1300 MHz | 1800 MHz |
| GPU | ARM Mali-400 MP2 @400 MHz | Adreno 506 |
| Touchscreen | | |
| DualSIM | | |
| SIM cards standard | DualSIM(microSIM, microSIM) | DualSIM(nanoSIM, nanoSIM) |
| DualSIM mode | dual standby | dual standby |
| Hybrid DualSIM | | |
| Announced | 1Q 2019 | 3Q 2018 |
| Other names | - | - |
| GSM frequencies | 900 1800 | 850 900 1800 1900 |
| UMTS | 900 2100 | 850 900 2100 |
| LTE standard | | FDD LTE: 2600, 2100, 1800, 900, 850, 800, 700 TDD LTE: 2600, 2500, 2300 |
| CDMA | | |
| Standard TD-SCDMA | | |
| UMA | | |
CAMERAS - BACK
| First camera | | |
| Photo matrix | 8 Mpx | 13 Mpx |
| Optical zoom | | |
| Flash | LED | LED |
| Dual-colour LED flash | | |
| Video formats | MPEG4, H.263, H.264 | MPEG4, H.263, H.264 |
| Additional | AF | f/2.2 |
| Second camera | | |
| Photo matrix | nd | 2 Mpx |
| Resolution | nd | 1600x1200 px |
| Optical zoom | nd | |
| Flash | nd | LED |
| Dual-colour LED flash | nd | |
| Video formats | nd | MPEG4, H.263, H.264 |
| Additional | nd | f/2.4 |
CAMERAS - FRONT
| First camera | | |
| Photo matrix | 5 Mpx | 8 Mpx |
| Optical zoom | | |
| Flash | LED | |
| Dual-colour LED flash | | |
| Video formats | MPEG4, H.263, H.264 | MPEG4, H.263, H.264 |
| Additional | FF | f/2.2 |
SENSORS
| Accelerometer | | |
| Proximity | | |
| Light | | |
| Magnetometer | | |
| Gyroscope | | |
| Barometer | | |
| Altimeter | | |
| Gravity | | |
| Hall-effect | | |
| Iris scanner | | |
| Fingerprint scanner | | |
| Thermometer | | |
| Hygrometer | | |
Data transfer
| xHTML | | |
| WAP | v2.0 | v2.0 |
| HSCSD | | |
| HSDPA | | |
| HSUPA | | |
| HSPA | | |
| HSPA+ | | |
| LTE DL | | |
| LTE UP | | |
| WIMAX+ | | |
| GPRS | | |
| EDGE | | |
| Bluetooth | v4.0 | v4.2 |
| A2DP Profile | | |
| HDMI | | |
| WiFi | v802.11 b/g/n | v802.11 b/g/n |
| WiFi frequencies | 2,4 GHz | 2,4 GHz |
| DLNA | | |
| Miracast | | |
| WiFi hotspot | | |
| IrDA | | |
| USB | v2.0 | v2.0 |
| GPS | | |
| A-GPS | | |
| GLONASS | | |
| Beidou | | |
| Galileo | | |
| QZSS | | |
| NFC | | |
COMMUNICATION AND MESSAGING
| Call waiting | | |
| Conferency | | |
| Call forwarding | | |
| Push To Talk | | |
| Instant Messenger | | |
| SMS | | |
| EMS | | |
| MMS | | |
| Dictionary | XT9 | XT9 |
| Swype | | |
| e-mail client | POP3, IMAP4, SMTP | POP3, IMAP4, SMTP |
| Hardware QWERTY keyboard | | |
| RSS Reader | | |
Multimedia
| Radio | | |
| MP3 | | |
| Stereo speakers | | |
| Audio Jack | 3.5 mm | 3.5 mm |
| HD Voice | | |
| Sound formats | AAC, AMR, IMY, M4A, MID, WAV | AAC, AAC+, AMR, WAV, eAAC+ |
| Polyphony | | |
| Video ringtone | | |
| Ring composer | | |
| Java | ART | ART |
| Videophone | | |
| DVB-H television | | |
| TV-Out | | |
PIM AND ADDITIONAL FUNCTIONS
| Watch | | |
| Stopwatch | | |
| Alarm | | |
| Calculator | | |
| Currency converter | | |
| Organizer | | |
| Calendar | | |
| Flight mode | | |
| SyncML | | |
| Data and fax | | |
| Screensaver | | |
| Themes | | |
| Interchangeable covers | | |
| Voice dial | | |
| Speakerphone | | |
| Recorder | | |
| Vibrations | | |