vivo X21 vs Xiaomi MI-3

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

  MI-3:

  LCD

• Weight

  MI-3: 11.2 g lighter

  X21:

  156.2 g

  MI-3:

  145 g

• Width

  MI-3: 1.2 mm narrower

  X21:

  74.8 mm

  MI-3:

  73.6 mm

• Screen diagonal

  MI-3: 1.28 in smaller diagonal

  X21:

  6.28 in

  MI-3:

  5 in

• Memory variants

  At 64 GB storage

  X21:

  6 GB RAM

  MI-3:

  2 GB RAM

• Chipset

  X21:

  Qualcomm SDM660 Snapdragon 660 (14 nm)

  MI-3:

  Qualcomm MSM8274AB Snapdragon 800 (28 nm)

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 +10.5 mm versus MI-3

   Width:

   74.8 mm +1.2 mm versus MI-3

   Depth:

   7.4 mm

2. 2. MI-3

   Height:

   144 mm

   Width:

   73.6 mm

   Depth:

   8.1 mm +0.7 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. MI-3

   Screen diagonal:

   5 in

   Aspect ratio (height:width):

   16:9

   Approximate rectangular screen area:

   68.9 cm²

X21 has approximately 42.8% more rectangular screen area than MI-3.

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.