BLU J4 vs Xiaomi Mi 9

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

  Mi 9:

  OLED

• Weight

  J4: 15 g lighter

  J4:

  158 g

  Mi 9:

  173 g

• Width

  J4: 2.4 mm narrower

  J4:

  72.3 mm

  Mi 9:

  74.7 mm

• Screen diagonal

  J4: 0.89 in smaller diagonal

  J4:

  5.5 in

  Mi 9:

  6.39 in

• Rear camera layout

  J4:

  Single

  Mi 9:

  Triple

• Depth

  Mi 9: 2.4 mm thinner

  J4:

  10 mm

  Mi 9:

  7.6 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 +2.4 mm versus Mi 9

2. 2. Mi 9

   Height:

   157.5 mm +6.5 mm versus J4

   Width:

   74.7 mm +2.4 mm versus J4

   Depth:

   7.6 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. Mi 9

   Screen diagonal:

   6.39 in

   Aspect ratio (height:width):

   19.5:9

   Approximate rectangular screen area:

   100.2 cm²

Mi 9 has approximately 28.4% 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.