A1 Alpha vs vivo X21

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

  Alpha:

  LCD

  X21:

  OLED

• Weight

  Alpha: 6.2 g lighter

  Alpha:

  150 g

  X21:

  156.2 g

• Width

  X21: 1 mm narrower

  Alpha:

  75.8 mm

  X21:

  74.8 mm

• Memory variants

  At 64 GB storage

  Alpha:

  3 GB RAM

  X21:

  6 GB RAM

• Chipset

  Alpha:

  Unisoc SC9863A (28nm)

  X21:

  Qualcomm SDM660 Snapdragon 660 (14 nm)

• Depth

  X21: 0.7 mm thinner

  Alpha:

  8.1 mm

  X21:

  7.4 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. Alpha

   Height:

   151.7 mm

   Width:

   75.8 mm +1 mm versus X21

   Depth:

   8.1 mm +0.7 mm versus X21

2. 2. X21

   Height:

   154.5 mm +2.8 mm versus Alpha

   Width:

   74.8 mm

   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. Alpha

   Screen diagonal:

   6.26 in

   Aspect ratio (height:width):

   19:9

   Approximate rectangular screen area:

   97.8 cm²

2. 2. X21

   Screen diagonal:

   6.28 in

   Aspect ratio (height:width):

   19:9

   Approximate rectangular screen area:

   98.4 cm²

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.