vivo X21 UD vs ZTE Libra

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.

• Screen diagonal

  Libra: 2.78 in smaller diagonal

  X21 UD:

  6.28 in

  Libra:

  3.5 in

• Chipset

  X21 UD:

  Qualcomm SDM660 Snapdragon 660 (14 nm)

  Libra:

  Qualcomm MSM7227 Snapdragon S1

• Rear camera layout

  X21 UD:

  Dual

  Libra:

  Single

• Release year

  X21 UD:

  2018

  Libra:

  2011

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 UD

   Height:

   154.5 mm

   Width:

   74.8 mm

   Depth:

   7.4 mm

   Weight:

   156.2 g

2. 2. Libra

   Height:

   Unknown

   Width:

   Unknown

   Depth:

   Unknown

   Weight:

   Unknown

   Unavailable dimensions are omitted from the drawing.

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 UD

   Screen diagonal:

   6.28 in

   Aspect ratio (height:width):

   19:9

   Approximate rectangular screen area:

   98.4 cm²

2. 2. Libra

   Screen diagonal:

   3.5 in

   Aspect ratio (height:width):

   5:3

   Approximate rectangular screen area:

   34.9 cm²

X21 UD has approximately 182.3% more rectangular screen area than Libra.

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.

At least two unambiguous positive capacity values are needed for a chart. Original entries remain in the specifications.

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.