BLU J4 vs Lava Z71

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.

• Weight

  Z71: 8 g lighter

  J4:

  158 g

  Z71:

  150 g

• Width

  Z71: 1.4 mm narrower

  J4:

  72.3 mm

  Z71:

  70.9 mm

• Screen diagonal

  J4: 0.21 in smaller diagonal

  J4:

  5.5 in

  Z71:

  5.71 in

• Memory variants

  At 32 GB storage

  J4:

  1 GB RAM

  Z71:

  2 GB RAM

• Rear camera layout

  J4:

  Single

  Z71:

  Dual

• Depth

  Z71: 1 mm thinner

  J4:

  10 mm

  Z71:

  9 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 +5.4 mm versus Z71

   Width:

   72.3 mm +1.4 mm versus Z71

   Depth:

   10 mm +1 mm versus Z71

2. 2. Z71

   Height:

   145.6 mm

   Width:

   70.9 mm

   Depth:

   9 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. Z71

   Screen diagonal:

   5.71 in

   Aspect ratio (height:width):

   19:9

   Approximate rectangular screen area:

   81.4 cm²

Z71 has approximately 4.2% 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.