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  2. BLU J4 vs Oppo A31

BLU J4 vs Oppo A31

Compare recorded specifications, size and practical differences.

BLU J4

BLU J4

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    Oppo A31

    Oppo A31

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        Key differences

        Calculated from recorded specifications using minimum difference thresholds. These are differences, not an overall ranking. For three phones, numeric highlights compare the two extremes.

        • WeightJ4: 22 g lighterJ4: 158 g · A31: 180 g
        • WidthJ4: 3.2 mm narrowerJ4: 72.3 mm · A31: 75.5 mm
        • Screen diagonalJ4: 1 in smaller diagonalJ4: 5.5 in · A31: 6.5 in
        • Rear camera layoutSingle / TripleJ4: Single · A31: Triple
        • DepthA31: 1.7 mm thinnerA31: 8.3 mm · J4: 10 mm
        • HeightJ4: 12.9 mm shorterJ4: 151 mm · A31: 163.9 mm

        Physical size

        Relative size, not calibrated actual size. Front and side outlines share one scale and a bottom baseline. Generic outlines use recorded body dimensions, excluding camera bumps.

        Front
        J4: 151 × 72.3 mm 1 A31: 163.9 × 75.5 mm 2
        Side
        J4: 151 × 10 mm 1 A31: 163.9 × 8.3 mm 2
        1. 1. J4
          Height
          151 mm
          Width
          72.3 mm
          Depth
          10 mm
          Weight
          158 g
        2. 2. A31
          Height
          163.9 mm
          Width
          75.5 mm
          Depth
          8.3 mm
          Weight
          180 g

        Specifications

        Open a section for more detail. Scroll inside a table to keep phone names visible; on narrow screens, swipe sideways or use the arrow keys while the table is focused. Unknown means missing data, not No. Recorded zero values are shown as recorded.

        Everyday essentials
        Everyday essentials
        SpecificationJ4A31
        Dimensions (HxWxD)
        • 151 Х 72.3 Х 10 mm
        • 163.9 Х 75.5 Х 8.3 mm
        Weight
        • 158 g
        • 180 g
        Technology
        • IPS LCD
        • IPS LCD
        Screen size
        • 5.5" inch
        • 6.5" inch
        Screen resolution
        • 720 x 1440 px
        • 720 x 1600 px
        Internal memoryRecorded storage / RAM variants. Entries are alternatives, not a combined maximum. Ambiguous formats stay as recorded.
        • 32GB 1GB RAM
        • 128GB 4GB RAM
        Memory card support
        • microSDXC
        • microSDXC (dedicated slot)
        BatteryCapacity is not battery life. No endurance test is implied.
        • 2200 mAh
        • Removable Li-Po
        • 4230 mAh
        • Non-removable Li-Po
        Operating system OS
        • Android 8.1 Oreo (Go edition)
        • Android 9.0 (Pie); ColorOS 6.1
        Chipset Unknown
        • Mediatek MT6765V/CB Helio P35 (12nm)
        Headphone jack
        • Yes
        • Yes
        Display
        Display
        SpecificationJ4A31
        Touchscreen
        • capacitive touchscreen
        • capacitive touchscreen
        Display colors
        • 16M
        • 16M
        Screen area
        • 78.1 cm2
        • 102.0 cm2
        Screen format
        • 18:9 (height:width)
        • 20:9 (height:width)
        Screen to body ratio
        • 71.5%
        • 82.4%
        PPI /points per inch/
        • 293 PPI
        • 270 PPI
        Camera and Video
        Camera and Video
        SpecificationJ4A31
        Rear camera, main
        • 8 MP
        • Single
        • 12 MP
        • Triple
        Camera specs
        • 8 MP
        • AF
        • 12 MP
        • f/1.8
        • (wide)
        • PDAF -2 MP
        • f/2.4
        • 27mm (macro)
        • 1/5.0''
        • 1.75µm -2 MP
        • (depth)
        Functions
        • LED flash
        • HDR
        Video
        • 720p@30fps
        • 1080p@30fps
        Front camera, selfie
        • 8 MP
        • Single
        • 8 MP
        • Single
        Specifications
        • 8 MP
        • 8 MP
        • f/2.0
        Performance
        Performance
        SpecificationJ4A31
        Processor CPU
        • Quad-core 1.3 GHz Cortex-A7
        • Octa-core (4x2.3 GHz Cortex-A53 & 4x1.8 GHz Cortex-A53)
        Graphics processor GPU
        • Mali-400
        • PowerVR GE8320
        Antutu 8 scoreLegacy recorded score. Test conditions are unspecified; no new testing is implied. Unknown
        • 105221
        General specs
        General specs
        SpecificationJ4A31
        Release date
        • 2019
        • October
        • 2020
        • February 13
        Colors
        • Blue
        • Black
        • Brown
        • Fantasy White
        • Mystery Black
        Historical recorded priceLegacy catalogue value; date unknown. Not a current offer.
        • 70 EUR
        • 180 EUR
        Body build Unknown
        • Glass front
        • plastic back
        • plastic frame
        Communication and Connectivity
        Communication and Connectivity
        SpecificationJ4A31
        SIM card
        • Dual SIM (Nano-SIM
        • dual stand-by)
        • Dual SIM (Nano-SIM
        • dual stand-by)
        Network
        • Show all network frequencies: -2G - GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
        • Show all network frequencies: -2G - GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 -3G - HSDPA 850 / 900 / 2100 -4G - LTE (unspecified)
        Speed
        • HSPA 21.1/5.76 Mbps
        • HSPA 42.2/5.76 Mbps
        • LTE-A
        GPRS
        • Yes
        • Yes
        Edge
        • Yes
        • Yes
        Wi-Fi
        • Wi-Fi 802.11 b/g/n
        • Wi-Fi Direct
        • hotspot
        • Wi-Fi 802.11 a/b/g/n/ac
        • dual-band
        • Wi-Fi Direct
        • hotspot
        GPS
        • Yes
        • with A-GPS
        • Yes
        • with A-GPS
        • BDS
        USB
        • microUSB 2.0
        • microUSB 2.0
        • USB On-The-Go
        Bluetooth
        • 4.1
        • A2DP
        • LE
        • 5.0
        • A2DP
        • LE
        Music and Audio
        Music and Audio
        SpecificationJ4A31
        Radio
        • FM radio
        • FM radio
        Others Unknown
        • 480 nits typ. brightness
        Other features
        Other features
        SpecificationJ4A31
        Dop
        • Sensors Accelerometer For USA
        • Sensors Fingerprint (rear-mounted)
        • accelerometer
        • proximity
        • compass

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