vivo X21 vs Xiaomi Redmi Note 4

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

  X21:

  OLED

  Redmi Note 4:

  LCD

• Weight

  X21: 8.8 g lighter

  X21:

  156.2 g

  Redmi Note 4:

  165 g

• Width

  X21: 1.2 mm narrower

  X21:

  74.8 mm

  Redmi Note 4:

  76 mm

• Screen diagonal

  Redmi Note 4: 0.78 in smaller diagonal

  X21:

  6.28 in

  Redmi Note 4:

  5.5 in

• Chipset

  X21:

  Qualcomm SDM660 Snapdragon 660 (14 nm)

  Redmi Note 4:

  Qualcomm MSM8953 Snapdragon 625 (14 nm)

• Rear camera layout

  X21:

  Dual

  Redmi Note 4:

  Single

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. X21

   Height:

   154.5 mm +3.5 mm versus Redmi Note 4

   Width:

   74.8 mm

   Depth:

   7.4 mm

2. 2. Redmi Note 4

   Height:

   151 mm

   Width:

   76 mm +1.2 mm versus X21

   Depth:

   8.5 mm +1.1 mm versus X21

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. X21

   Screen diagonal:

   6.28 in

   Aspect ratio (height:width):

   19:9

   Approximate rectangular screen area:

   98.4 cm²

2. 2. Redmi Note 4

   Screen diagonal:

   5.5 in

   Aspect ratio (height:width):

   16:9

   Approximate rectangular screen area:

   83.4 cm²

X21 has approximately 18% more rectangular screen area than Redmi Note 4.

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.