vivo X21 vs ZTE Axon 9 Pro

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: 13.8 g lighter

  X21:

  156.2 g

  Axon 9 Pro:

  170 g

• Screen diagonal

  Axon 9 Pro: 0.78 in smaller diagonal

  X21:

  6.28 in

  Axon 9 Pro:

  5.5 in

• Chipset

  X21:

  Qualcomm SDM660 Snapdragon 660 (14 nm)

  Axon 9 Pro:

  Qualcomm MSM8996 Snapdragon 821 (14 nm)

• Depth

  X21: 0.5 mm thinner

  X21:

  7.4 mm

  Axon 9 Pro:

  7.9 mm

• Height

  Axon 9 Pro: 2.8 mm shorter

  X21:

  154.5 mm

  Axon 9 Pro:

  151.7 mm

• Release year

  X21:

  2018

  Axon 9 Pro:

  2017

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 +2.8 mm versus Axon 9 Pro

   Width:

   74.8 mm

   Depth:

   7.4 mm

2. 2. Axon 9 Pro

   Height:

   151.7 mm

   Width:

   75 mm

   Depth:

   7.9 mm +0.5 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. Axon 9 Pro

   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 Axon 9 Pro.

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.