BLU J4 vs Samsung Galaxy A31

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.

• Display technology

  OLED versus LCD

  J4:

  LCD

  Galaxy A31:

  OLED

• Weight

  J4: 27 g lighter

  J4:

  158 g

  Galaxy A31:

  185 g

• Screen diagonal

  J4: 0.9 in smaller diagonal

  J4:

  5.5 in

  Galaxy A31:

  6.4 in

• Rear camera layout

  J4:

  Single

  Galaxy A31:

  Quad

• Depth

  Galaxy A31: 1.4 mm thinner

  J4:

  10 mm

  Galaxy A31:

  8.6 mm

• Height

  J4: 8.3 mm shorter

  J4:

  151 mm

  Galaxy A31:

  159.3 mm

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.

1. 1. J4

   Height:

   151 mm

   Width:

   72.3 mm

   Depth:

   10 mm +1.4 mm versus Galaxy A31

2. 2. Galaxy A31

   Height:

   159.3 mm +8.3 mm versus J4

   Width:

   73.1 mm

   Depth:

   8.6 mm

Screen size

Approximate rectangular screens calculated from recorded diagonal and aspect ratio at one relative scale. Rounded corners and cutouts are not subtracted. These are not phone outlines or calibrated actual sizes.

1. 1. J4

   Screen diagonal:

   5.5 in

   Aspect ratio (height:width):

   18:9

   Approximate rectangular screen area:

   78.1 cm²

2. 2. Galaxy A31

   Screen diagonal:

   6.4 in

   Aspect ratio (height:width):

   20:9

   Approximate rectangular screen area:

   98.9 cm²

Galaxy A31 has approximately 26.7% more rectangular screen area than J4.

Memory variants

Each row compares the same storage capacity. Cells show recorded RAM alternatives, not combined maxima. Not recorded does not mean unavailable in every market.

Practical features

Explicit Yes and No values are shown directly. Qualified or regional records retain their details. Unknown means the record is missing.

Battery capacity

Capacity is not battery life. No endurance test is implied.

Open a section for more detail. On narrow screens, swipe sideways or use Left/Right arrow keys while the table is focused. Unknown means missing data, not No. Recorded zero values are shown as recorded.