Google Pixel 4 vs vivo X21 UD

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

  X21 UD: 5.8 g lighter

  Pixel 4:

  162 g

  X21 UD:

  156.2 g

• Width

  Pixel 4: 6 mm narrower

  Pixel 4:

  68.8 mm

  X21 UD:

  74.8 mm

• Screen diagonal

  Pixel 4: 0.58 in smaller diagonal

  Pixel 4:

  5.7 in

  X21 UD:

  6.28 in

• Chipset

  Pixel 4:

  Qualcomm SDM855 Snapdragon 855 (7 nm)

  X21 UD:

  Qualcomm SDM660 Snapdragon 660 (14 nm)

• Depth

  X21 UD: 0.8 mm thinner

  Pixel 4:

  8.2 mm

  X21 UD:

  7.4 mm

• Height

  Pixel 4: 7.4 mm shorter

  Pixel 4:

  147.1 mm

  X21 UD:

  154.5 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. Pixel 4

   Height:

   147.1 mm

   Width:

   68.8 mm

   Depth:

   8.2 mm +0.8 mm versus X21 UD

2. 2. X21 UD

   Height:

   154.5 mm +7.4 mm versus Pixel 4

   Width:

   74.8 mm +6 mm versus Pixel 4

   Depth:

   7.4 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. Pixel 4

   Screen diagonal:

   5.7 in

   Aspect ratio (height:width):

   19:9

   Approximate rectangular screen area:

   81.1 cm²

2. 2. X21 UD

   Screen diagonal:

   6.28 in

   Aspect ratio (height:width):

   19:9

   Approximate rectangular screen area:

   98.4 cm²

X21 UD has approximately 21.4% more rectangular screen area than Pixel 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.