Coolpad Mega 3 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.

• Display technology

  OLED versus LCD

  Mega 3:

  LCD

  X21 UD:

  OLED

• Weight

  X21 UD: 13.8 g lighter

  Mega 3:

  170 g

  X21 UD:

  156.2 g

• Width

  X21 UD: 2.2 mm narrower

  Mega 3:

  77 mm

  X21 UD:

  74.8 mm

• Screen diagonal

  Mega 3: 0.78 in smaller diagonal

  Mega 3:

  5.5 in

  X21 UD:

  6.28 in

• Chipset

  Mega 3:

  Mediatek MT6737 (28 nm)

  X21 UD:

  Qualcomm SDM660 Snapdragon 660 (14 nm)

• Rear camera layout

  Mega 3:

  Single

  X21 UD:

  Dual

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. Mega 3

   Height:

   152 mm

   Width:

   77 mm +2.2 mm versus X21 UD

   Depth:

   8.2 mm +0.8 mm versus X21 UD

2. 2. X21 UD

   Height:

   154.5 mm +2.5 mm versus Mega 3

   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. Mega 3

   Screen diagonal:

   5.5 in

   Aspect ratio (height:width):

   16:9

   Approximate rectangular screen area:

   83.4 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 18% more rectangular screen area than Mega 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.